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Journal of the American Academy of Orthopaedic Surgeons:
doi: 10.5435/JAAOS-20-08-498
Review Article

Displaced Clavicle Fractures in Adolescents: Facts, Controversies, and Current Trends

Pandya, Nirav K. MD; Namdari, Surena MD, Msc; Hosalkar, Harish S. MD

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Author Information

From the Department of Pediatric Orthopaedic Surgery, Rady Children's Hospital‐San Diego, San Diego, CA (Dr. Pandya and Dr. Hosalkar) and the Department of Orthopaedic Surgery, Hospital of the University of Pennsylvania, Philadelphia, PA (Dr. Namdari).

Dr. Pandya or an immediate family member serves as a board member, owner, officer, or committee member of the Pediatric Orthopaedic Society of North America. Dr. Hosalkar or an immediate family member is a member of a speakers' bureau or has made paid presentations on behalf of Synthes, serves as a paid consultant to or is an employee of Allergan and Synthes, and has stock or stock options held in GlaxoSmithKline, Johnson & Johnson, and Pfizer. Neither Dr. Namdari nor any immediate family member has received anything of value from or owns stock in a commercial company or institution related directly or indirectly to the subject of this article.

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Abstract

There is an increasing trend toward stabilization and fixation of markedly displaced midshaft clavicle fractures in adolescents. Recent studies in the adult literature have shown a greater prevalence of symptomatic malunion, nonunion, and poor functional outcomes after nonsurgical management of displaced fractures. Fixation of displaced midshaft clavicle fractures can restore length and alignment, resulting in shorter time to union. Symptomatic malunion after significantly displaced fractures in adolescents may be more common than previously thought. Adolescents often have high functional demands, and their remodeling potential is limited. Knowledge of bone biology and the effects of shortening, angulation, and rotation on shoulder girdle mechanics is critical in decision making in order to increase the likelihood of optimal results at skeletal maturity. Selection of fixation is dependent on many factors, including fracture type, patient age, skeletal maturity, and surgeon comfort.

Few studies have specifically investigated outcomes of surgical and nonsurgical management of clavicle fractures in children and adolescents; thus, most data are extrapolated from the adult literature. Because of a traditional belief that clavicular nonunions are rare, midshaft clavicle fractures in adults have routinely been managed nonsurgically, even in the setting of substantial displacement.1 More recently, however, higher rates of nonunion and unsatisfactory patient‐derived outcomes have been reported in cases of nonsurgically managed displaced midshaft clavicle fractures in adults.2,3 Additionally, two recent randomized controlled studies demonstrated the superiority of surgical management of completely displaced clavicle fractures in adults.4,5 Despite this evidence, definite indications for fixation of clavicle fractures in adult patients are not well‐established. Indications for fixation of clavicle fractures in children and adolescents are even less clear.

Clavicle fractures in adolescents have traditionally been managed nonsurgically; however, the successful outcomes achieved from fixation of displaced clavicle fractures in adults have called into question this classic teaching. This shift in philosophy has led some pediatric orthopaedic surgeons to search for and refine indications for fixation of clavicle fractures in skeletally immature patients, particularly in highly functional and active adolescents. Children have great potential for fracture healing and remodeling. However, as they enter adolescence, children become more active than adult patients, lose the ability to remodel, and theoretically may have greater functional impairment resulting from residual disability.

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Anatomy

The clavicle is an S‐shaped bone whose medial end is connected to the axial skeleton via the sternoclavicular joint and whose lateral end is connected to the scapula via the acromioclavicular joint. Phylogenetically, it has played a critical role in avian species, bipeds, and quadrupeds. As mammals evolved into an erect species, the clavicle continued to be a critical bone, attaching and suspending the entire upper extremity and scapular blade to the thoracic girdle. It is the first bone to ossify in the fifth week in utero.6 Initial growth (<5 years) occurs from the ossification center in the central portion of the clavicle, whereas continued growth occurs at the medial and lateral epiphyseal plates.7,8 During childhood, approximately 80% of clavicular growth occurs at the medial physis.7 The medial growth plate is the last physis to close, generally at age 23 to 25 years.8

Several fascial layers and muscles attach to the clavicle and help to create the predictable deformity seen with fractures. Midshaft fractures are the most common type (Figure 1). These fractures occur in the middle third of the clavicle and include all fractures lateral to the sternocleidomastoid muscle and medial to the coracoclavicular ligaments. The medial fragment is pulled superiorly and posteriorly by the sternocleidomastoid muscle. The lateral segment sags forward and rotates inferiorly because of the weight of the upper extremity and, to a lesser extent, the pull of the pectoralis muscle on the humerus.9 More complex fracture patterns can also occur, as seen in Figure 2.

Figure 1
Figure 1
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Figure 2
Figure 2
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Effect of Clavicle Malunion on Scapular Kinematics

The normal clavicle undergoes complex three‐dimensional motion. Clavicular motion is linked directly to the surrounding motion of the scapula via attachment to the acromioclavicular joint and to the surrounding motion of the sternum via attachments to the sternoclavicular joint.9 During elevation of the arm and with respect to the thorax, the clavicle generally undergoes elevation of 11° to 15°, retraction of 15° to 29°, and posterior long‐axis rotation of 15° to 31°.10 The magnitude of motion varies by subject and plane of motion.

Although nonsurgically managed clavicle fractures typically heal with some degree of deformity, functional results have been considered to be generally acceptable. However, more recent studies have highlighted the importance of clavicle shortening and displacement in determining healing potential and functional outcomes, which has created interest in the role of clavicle malunion on shoulder girdle kinematics.11‐13 Changes in the resting position of the scapula can lead to scapular dyskinesis and pain on arm movement. Additionally, scapular malrotation may change the orientation of the glenoid relative to the humeral head, which could lead to altered joint reactive forces. In an experimental cadaver model, Andermahr et al12 demonstrated that healing of clavicle fractures with bony shortening leads to a ventromedial caudal shift in the position of the glenoid fossa. They hypothesized that this malposition can result in functional deficits in abduction, particularly overhead motion. Most recently, in a cadaver study evaluating the effect of shortening deformity of the clavicle on scapular kinematics, Matsumura et al13 found that posterior tilting and external rotation of the scapula significantly decreased with ≥10% shortening.

Although it is clear that clavicle shortening leads to alteration in the normal scapular position, the clinical influence of these changes has not been extensively studied. Ledger et al11 evaluated the impact of clavicle malunion (ie, 15 mm of shortening) on anatomic and functional outcomes in 10 patients. They noted a reduction in muscular strength for adduction, extension, and internal rotation of the humerus as well as reduced peak abduction velocity in the injured shoulder. In a larger clinical study of mostly adult patients, Lazarides and Zafiropoulos14 reviewed 132 patients with united fractures of the middle third of the clavicle after nonsurgical management at a minimum follow‐up of 1 year. Of these, 25.8% reported overall dissatisfaction with the result of their management. Final clavicular shortening of >18 mm in male patients and >14 mm in female patients was significantly associated with patientreported overall dissatisfaction with nonsurgical treatment (P < 0.001 for each). The study included 93 males with a mean age of 25.4 years (range, 16 to 72 years) and 39 females with a mean age of 34.2 years (range, 15 to 77 years).

No study has evaluated kinematics of the shoulder girdle in the setting of clavicular malunion in skeletally immature patients. Furthermore, it is not clear which level of clavicle malunion leads to a clinically significantly altered scapular position and a poor functional result in this patient population. To determine the extent of clavicle shortening, investigators also must consider interindividual variation in total clavicle length.11 For example, 2 cm of shortening in a 10‐cm pediatric clavicle will result in relative shortening of 20%, whereas 2 cm of shortening in a 17‐cm adult clavicle will result in relative shortening of 12%. This is important because the same amount of shortening will result in different degrees of change in scapular position and sternoclavicular angulation.15 As a result, it may not be possible to apply to skeletally immature patients established radiographic predictors of poor outcome in skeletally mature patients.

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Radiography

Typically, a standard AP radiograph and a 45° cephalic tilt view are obtained to assess clavicle fracture pattern, displacement, and angulation.9 Although shortening in clavicle fractures is considered to be an important parameter in selecting a treatment modality, no standardized method of measurement exists. Considerable variability exists in measurement techniques. Shortening may be measured on a standardized 15° tilted radiograph of the clavicle, a 15° uptilted AP panorama radiograph of the shoulder girdle,16 a standardized PA thorax radiograph,14 an abduction lordosis view,17 or clinically with a simple tape measure.18 Smekal et al15 assessed the different measurement methods and found that the highest agreement with CT measurements was shown by PA thorax radiographs with the patient standing erect and the clavicles positioned close to the x‐ray film. Regardless of technique, the authors noted a relatively low repeatability. They attributed this finding to the limitation of two‐dimensional radiographs, which can lead to misinterpretation of overlapping fragments.

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Advanced Imaging Studies

CT, which is less commonly used than plain radiography, allows threedimensional reconstruction of the clavicle. This is important in measuring the true total length of the clavicle independent of its angle in reference to the frontal and sagittal planes15 and because of the interindividual variability in total clavicle length. No study has evaluated the accuracy of normal clavicular length measurement on plain radiography compared with CT. However, given the variability in radiograph plate and beam angles and distance, it is unlikely that a true length measurement can be obtained in a reproducible manner in two dimensions. In our practice (H.S.H.), we commonly utilize three‐dimensional CT to evaluate total length, shortening, and comminution of clavicle fractures for which plain radiographs indicate the need for surgical management.

Drawbacks of CT include cost and radiation exposure. Depending on the machine settings, the organ being studied typically receives a radiation dose of 15 mSv in an adult and 30 mSv in a neonate for a single CT scan, with an average of two or three CT scans in a single evaluation.19 Children are at greater risk than adults from a given dose of radiation because children are inherently more radiosensitive and because they have more remaining years of life during which radiation‐induced cancer could develop.20 CT is done with the patient in the supine position; theoretically, with the shoulder girdle muscles relaxed and gravity acting as a tension mechanism, the fracture may become reduced.15 However, the correlation between measurements of clavicle fracture shortening on CT and standing plain radiographs has not been determined, and the clinical significance of patient positioning is unclear.

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Management

Historically, pediatric midshaft clavicle fractures have been managed nonsurgically. Recent studies have expanded the surgical indications in the adult population beyond injuries that are open or associated with neurovascular compromise to include fractures with >15 to 20 mm of shortening, 100% displacement, and significant comminution.2,9,21 However, the applicability of these findings to pediatric patients is unclear.

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Nonsurgical

Traditionally, excellent outcomes have been achieved with nonsurgical management of pediatric clavicle fractures. Treatment generally consists of 2 to 4 weeks of immobilization in either a figure‐of‐8 brace or a shoulder sling, followed by range of motion (ROM) activities and a return to sports activities 6 to 8 weeks after the date of injury, provided the fracture site is no longer tender.22 In a review of 38 pediatric trauma patients with head injury and concomitant clavicle fractures, Wilkes and Hoffer23 found that all fractures healed and exhibited excellent remodeling. In addition, patients regained full shoulder ROM even without immobilization.

Questions remain regarding the ideal type of immobilization. In a Cochrane review, Lenza et al24 evaluated the available evidence from two trials comparing the figure‐of‐8 bandage with an arm sling. The only statistically significant difference in clinical outcome between the two groups was that the patients treated with figure‐of‐8 bracing had significantly higher pain scores at 15‐day follow‐up in one trial (mean difference, 0.80; 95% confidence interval, 0.34 to 1.26; visual analog scale, 0 [no pain] to 10 [worst pain]). In the other study, neither healing nor reduction was affected by either method of immobilization. However, 9 of 34 patients treated with the figure‐of‐8 bandage were dissatisfied (26%), whereas only 2 of 27 patients treated with a sling were dissatisfied (7%) (relative chance of satisfaction for sling treatment, 1.3 [95% confidence interval, 1 to 1.6]; P = 0.09). The difference appeared to be associated with discomfort caused by the figure‐of‐8 brace, including impairment of agility and personal care, sleep disturbance, edema of the arm, and paresthesia.

The available evidence is not sufficient to allow definitive conclusions regarding which intervention is better. Given the ease with which a sling can be placed on pediatric patients as well as the minimal cost, we prefer slings when nonsurgical management is selected.

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Surgical

It is important to understand the studies behind the expanded indications for surgical management of midshaft clavicle fractures in adults and their potential applicability to the pediatric population. In a multicenter study, the Canadian Orthopaedic Trauma Society prospectively compared nonsurgical management with plate fixation to manage displaced midshaft clavicle fractures in adults.4 Surgically managed fractures had significantly improved Constant and Disability of the Arm, Shoulder and Hand (DASH) scores (P = 0.001 and P < 0.01, respectively), faster time to radiographic union (16.4 weeks with surgery versus 28.4 weeks without; P = 0.001), decreased rate of nonunion and malunion (P = 0.042 and P = 0.001, respectively), and improved patient satisfaction (appearance of the shoulder [P = 0.001]; shoulder in general [P = 0.002]). In a systematic review of 2,144 acute midshaft clavicle fractures, Zlowodzki et al25 found that comminuted displaced fractures had a higher rate of nonunion and longterm negative sequela with nonsurgical management, with a relative risk reduction of 57% for nonunion when plate fixation was applied.

Participation of pediatric patients in higher‐demand activities that place adult‐type demands on the shoulder girdle, with resultant fracture patterns that resemble highenergy adult trauma, begs the questions whether surgeons should be more aggressive in the surgical fixation of displaced clavicle fractures in children and whether midshaft clavicle fractures should be surgically fixed in the presence of >15 mm of shortening, 100% displacement, and/or significant comminution.2,9,21 There is a dearth of studies on surgical management of pediatric clavicle fractures. A review of several studies examining surgical interventions may provide a basis on which preliminary recommendations can be made and further studies developed.

Kubiak and Slongo26 provided one of the first reports on the surgical management of clavicle fractures in the pediatric population. The authors reviewed the outcomes of 939 children who presented with clavicle fracture over a period of 21 years; 924 of these patients were treated nonsurgically. The 15 children who underwent surgical treatment were managed with a variety of techniques (eg, Kirschner wires [K‐wires], osseous suture, elastic stable intramedullary nailing [ESIN], screw fixation, external fixation). Seven of the eight patients with midshaft clavicle fracture underwent surgery to address considerable displacement, shortening, and soft‐tissue impingement. The authors found complete healing and return of full shoulder ROM with surgical intervention with few minor complications (eg, hardware irritation, scar cosmesis) in the seven patients with midshaft fracture. The authors concluded that indications for the management of pediatric clavicle fractures should be expanded from the traditional indications of open injury and neurovascular compromise to include fractures with severe shortening and displacement. A strong recommendation was also made for the use of ESIN as opposed to other techniques.

Prinz et al27 also reported on the use of K‐wires and ESIN in the surgical management of pediatric clavicle fractures and examined the role of patient age in surgical decision making. All patients aged <10 years were treated nonsurgically. Ten of the patients aged ≥10 years and with displaced clavicle fractures were treated surgically and achieved good functional and cosmetic results as measured by the Constant score and a patient satisfaction questionnaire. The authors concluded that, in patients aged ≥10 years, surgical treatment with ESIN can lead to improved pain relief and patient satisfaction, largely resulting from a shorter immobilization time. To our knowledge, no other studies have specifically assessed wire fixation or ESIN in a pediatric population.

Several reports in the adult literature indicate that smooth pins are associated with risk of migration in upper extremity surgery.28–31 In addition, intramedullary nailing of clavicular midshaft fractures is technically demanding, with risk of high fluoroscopy and surgical times, cortical perforations, nail breakage, and hardware irritation.32 For these reasons, we do not currently perform wire or ESIN fixation of pediatric clavicle fractures.

An examination of adult type implants in the surgical management of pediatric clavicle fractures is also imperative, particularly the role of plating. Vander Have et al33 retrospectively compared the results of 42 adolescent patients who were treated for midshaft clavicle fractures (mean age, 15.4 years). Twenty‐five patients were treated nonsurgically with a sling or figure‐of‐8 brace; the other 17 were treated with nonlocking anterosuperior compression plating. The surgical group had greater shortening at the time of injury (27.5 versus 12.5 mm), a quicker time to radiographic union (7.4 versus 8.7 weeks), and a faster return to full activities (12 versus 16 weeks). Although the quicker time to radiographic union was statistically significant (P = 0.02), we do not believe that this small time difference is clinically relevant. In addition, although the authors do not provide statistical analysis to determine whether the 4‐week faster return to activity of the surgical group is statistically significant, we believe that it is clinically relevant. No patient in either group developed nonunion. However, symptomatic malunion developed in five of the nonsurgically treated patients (mean fracture shortening, 26 mm). Four of these five patients elected to undergo corrective osteotomy. In this study, symptomatic malunion was defined as fracture union with shortening or angulation and asymmetry, as compared with the uninvolved shoulder, and subjective complaints, including pain with overhead use, weakness, fatigability, and neurologic symptoms. We are unaware of any other reports that specifically address the need for corrective osteotomy to manage clavicular malunion in the pediatric population.

Mehlman et al34 retrospectively examined the outcomes of 24 adolescent patients who underwent surgical fixation of their displaced clavicular shaft fractures. Twentytwo patients underwent plate fixation. The patients achieved a 100% rate of union, a 100% rate of satisfaction, and an 87% rate of return to unrestricted sports activities. All patients returned for hardware removal after healing.

Most recently, Namdari et al35 retrospectively reviewed 14 skeletally immature patients (mean age, 12.9 years) with closed, displaced, midshaft clavicle fractures that were managed with open reduction and internal fixation (ie, plate fixation). Total quickDASH and simple shoulder test (SST) scores were determined at a minimum follow‐up of 24 months. In this study, the mean postoperative total quickDASH score was 7.0, and a mean of 11 questions were answered “yes” on the SST. All fractures healed. However, four patients from the surgical group required a second surgical procedure to remove hardware, and eight patients complained of numbness at the site of injury/surgery.

Hosalkar et al36 reviewed a series of surgical fixations performed at their institution to address displaced unilateral clavicle fracture in 19 adolescent patients (mean age, 14.6 years). Baseline demographic and radiographic data were collected preoperatively, and patients were evaluated postoperatively with functional outcomes measures such as the quickDASH and SST as well as additional binary questions. The mean quickDASH score was 4.0 at a mean follow‐up of 16 months (range, zero to 35.5 months), and the mean number of “yes” responses on the SST for all surgical patients was 11 (range, 9 to 12). Complete radiologic union was noted in all cases at 3‐month follow‐up, and all patients returned to full sports participation at a mean of 14 weeks (range, 12 to 17 weeks). Minimal hypertrophic scarring was noted in two patients, and no keloid formation or neurovascular deficit was noted. At 15‐month follow‐up, one patient reported implant prominence and complained of occasional discomfort. This patient elected to undergo implant removal and experienced a complete and uneventful recovery. All patients were satisfied with their decision to undergo surgical treatment. These results led the authors to conclude that anatomic reduction with internal fixation and early mobilization of displaced clavicle fractures in adolescent patients remains a viable treatment option with predictable results and no major complications when performed by experienced surgeons.

Excellent outcomes can be achieved with surgical management. However, patients and families must be counseled regarding the known risks of hardware failure, incisional numbness, and the potential need for a second surgery to remove hardware.

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The Authors' Preferred Method

At our institution (H.S.H.), adolescents with clavicle fractures that are completely displaced (ie, no cortical contact between the fracture ends) or comminuted, or that contain a transverse Z‐shaped fragment, are treated surgically. In addition, using as a guide the average length of the clavicle and the amount of shortening considered to be a relative indication for surgical intervention in adults (138 and 20 mm, respectively),4,37 we consider clavicle shortening of 14% to 15% (20/138) to be another relative indication for surgical intervention in adolescent patients. Relative shortening by itself is insufficient to warrant surgical intervention. It must be accompanied by comminution, marked displacement, or skin tenting. Fractures that are open or present with neurovascular compromise require surgical management, as well.

The patient is placed supine on a Jackson table, and a bump is placed under the scapula. A nonlocking compression plate is affixed to the superior surface of the clavicle. In the patient with severe comminution or osteopenia, a locking plate is used instead. In general, bone quality is excellent in pediatric patients, and nonlocking screws are preferred. Interfragmentary compression screws are used when the fracture pattern allows.

Postoperatively, the patient is kept in a sling and swath for 3 weeks, after which ROM exercises are begun. Following a progressive ROM and strengthening program and in the presence of clinical and radiographic signs of healing, the patient is allowed to return to sport at 12 weeks after the injury. Patients who are treated nonsurgically are typically placed in a simple shoulder sling for 3 to 4 weeks. A sling and swath is used acutely for 2 weeks in the patient with significant swelling and pain, after which ROM exercises and progressive strengthening are begun. Return to sport is allowed once the patient shows clinical (ie, no tenderness about the fracture site) and radiographic signs of healing.

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Summary

The current literature in the adult population has clearly shown that the indications for surgical fixation of midshaft clavicle fractures are expanding. Patient shoulder function, biomechanics, and risk of nonunion or malunion can be significantly affected based on the treatment course (ie, nonsurgical, surgical). The question persists whether markedly displaced fractures in the pediatric population should be managed surgically. The limited literature on surgical treatment in the pediatric population demonstrates that positive outcomes can be achieved with regard to shoulder function, patient satisfaction, and union. However, there is no specific criterion that can be universally and consistently applied to guide clinicians as to what type of fractures (ie, shortening, displaced, comminuted) should be surgically managed in this young population and in which manner.

Issues that remain unresolved include the degree of shortening that is acceptable, the degree of displacement that can be tolerated while still achieving union, the level of comminution that will heal without impairment in shoulder function, and the appropriate fixation method. Prospective comparative studies of larger numbers of pediatric patients may help guide future management of displaced clavicle fractures by determining indications for nonsurgical and surgical management in this active patient population.

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References

Evidence‐based Medicine: Levels of evidence are described in the table of contents. In this article, references 4, 5, 21, and 24 are level I studies. References 10 and 15 are level II studies. References 27 and 33 are level III studies. References 2, 3, 11, 14, 16, 18, 22, 23, 25, 26, 28‐32, 34, and 35 are level IV studies. References 1, 6‐9, 12, 13, 17, 19, 20, and 37 are level V expert opinion.

References printed in bold type indicate those published within the past 5 years.

1. Rowe CR: An atlas of anatomy and treatment of midclavicular fractures. Clin Orthop Relat Res 1968;58:29-42.

2. Hill JM, McGuire MH, Crosby LA: Closed treatment of displaced middlethird fractures of the clavicle gives poor results. J Bone Joint Surg Br 1997;79(4): 537-539.

3. Nordqvist A, Petersson CJ, Redlund-Johnell I: Mid-clavicle fractures in adults: End result study after conservative treatment. J Orthop Trauma 1998;12(8):572-576.

4. Canadian Orthopaedic Trauma Society: Nonoperative treatment compared with plate fixation of displaced midshaft clavicular fractures: A multicenter, randomized clinical trial. J Bone Joint Surg Am 2007;89(1):1-10.

5. Smekal V, Irenberger A, Struve P, Wambacher M, Krappinger D, Kralinger FS: Elastic stable intramedullary nailing versus nonoperative treatment of displaced midshaft clavicular fractures: A randomized, controlled, clinical trial. J Orthop Trauma 2009;23(2):106-112.

6. Gardner E: The embryology of the clavicle. Clin Orthop Relat Res 1968;58: 9-16.

7. Ogden JA, Conlogue GJ, Bronson ML: Radiology of postnatal skeletal development: III. The clavicle. Skeletal Radiol 1979;4(4):196-203.

8. Jit I, Kulkarni M: Times of appearance and fusion of epiphysis at the medial end of the clavicle. Indian J Med Res 1976; 64(5):773-782.

9. Jeray KJ: Acute midshaft clavicular fracture. J Am Acad Orthop Surg 2007; 15(4):239-248.

10. Ludewig PM, Behrens SA, Meyer SM, Spoden SM, Wilson LA: Threedimensional clavicular motion during arm elevation: Reliability and descriptive data. J Orthop Sports Phys Ther 2004; 34(3):140-149.

11. Ledger M, Leeks N, Ackland T, Wang A: Short malunions of the clavicle: An anatomic and functional study. J Shoulder Elbow Surg 2005;14(4):349-354.

12. Andermahr J, Jubel A, Elsner A, et al: Malunion of the clavicle causes significant glenoid malposition: A quantitative anatomic investigation. Surg Radiol Anat 2006;28(5):447-456.

13. Matsumura N, Ikegami H, Nakamichi N, et al: Effect of shortening deformity of the clavicle on scapular kinematics: A cadaveric study. Am J Sports Med 2010; 38(5):1000-1006.

14. Lazarides S, Zafiropoulos G: Conservative treatment of fractures at the middle third of the clavicle: The relevance of shortening and clinical outcome. J Shoulder Elbow Surg 2006; 15(2):191-194.

15. Smekal V, Deml C, Irenberger A, et al: Length determination in midshaft clavicle fractures: Validation of measurement. J Orthop Trauma 2008; 22(7):458-462.

16. Walz M, Kolbow B, Auerbach F: Elastic, stable intramedullary nailing in midclavicular fractures: A change in treatment strategies? [German]. Unfallchirurg 2006;109(3):200-211.

17. Riemer BL, Butterfield SL, Daffner RH, O'Keeffe RM Jr: The abduction lordotic view of the clavicle: A new technique for radiographic visualization. J Orthop Trauma 1991;5(4):392-394.

18. McKee MD, Wild LM, Schemitsch EH: Midshaft malunions of the clavicle: Surgical technique. J Bone Joint Surg Am 2004;86(suppl 1):37-43.

19. Brenner DJ, Doll R, Goodhead DT, et al: Cancer risks attributable to low doses of ionizing radiation: Assessing what we really know. Proc Natl Acad Sci U S A 2003;100(24):13761-13766.

20. Brenner DJ, Hall EJ: Computed tomography: An increasing source of radiation exposure. N Engl J Med 2007; 357(22):2277-2284.

21. Robinson CM, Court-Brown CM, McQueen MM, Wakefield AE: Estimating the risk of nonunion following nonoperative treatment of a clavicular fracture. J Bone Joint Surg Am 2004;86(7):1359-1365.

22. Bishop JY, Flatow EL: Pediatric shoulder trauma. Clin Orthop Relat Res 2005; (432):41-48.

23. Wilkes JA, Hoffer MM: Clavicle fractures in head-injured children. J Orthop Trauma 1987;1(1):55-58.

24. Lenza M, Belloti JC, Andriolo RB, Gomes Dos Santos JB, Faloppa F: Conservative interventions for treating middle third clavicle fractures in adolescents and adults. Cochrane Database Syst Rev 2009;2:CD007121.

25. Zlowodzki M, Zelle BA, Cole PA, Jeray K, McKee MD; Evidence-Based Orthopaedic Trauma Working Group: Treatment of acute midshaft clavicle fractures: Systematic review of 2144 fractures. On behalf of the Evidence-Based Orthopaedic Trauma Working Group. J Orthop Trauma 2005;19(7): 504-507.

26. Kubiak R, Slongo T: Operative treatment of clavicle fractures in children: A review of 21 years. J Pediatr Orthop 2002;22(6):736-739.

27. Prinz KS, Rapp M, Kraus R, Wessel LM, Kaiser MM: Dislocated midclavicular fractures in children and adolescents: Who benefits from operative treatment? [German.] Z Orthop Unfall 2010; 148(1):60-65.

28. Nordback I, Markkula H: Migration of Kirschner pin from clavicle into ascending aorta. Acta Chir Scand 1985; 151(2):177-179.

29. Nakayama M, Gika M, Fukuda H, et al: Migration of a Kirschner wire from the clavicle into the intrathoracic trachea. Ann Thorac Surg 2009;88(2):653-654.

30. Fransen P, Bourgeois S, Rommens J: Kirschner wire migration causing spinal cord injury one year after internal fixation of a clavicle fracture. Acta Orthop Belg 2007;73(3):390-392.

31. Leppilahti J, Jalovaara P: Migration of Kirschner wires following fixation of the clavicle: A report of 2 cases. Acta Orthop Scand 1999;70(5):517-519.

32. Frigg A, Rillmann P, Perren T, Gerber M, Ryf C: Intramedullary nailing of clavicular midshaft fractures with the titanium elastic nail: Problems and complications. Am J Sports Med 2009; 37(2):352-359.

33. Vander Have KL, Perdue AM, Caird MS, Farley FA: Operative versus nonoperative treatment of midshaft clavicle fractures in adolescents. J Pediatr Orthop 2010;30(4):307-312.

34. Mehlman CT, Yihua G, Bochang C, Zhigang W: Operative treatment of completely displaced clavicle shaft fractures in children. J Pediatr Orthop 2009;29(8):851-855.

35. Namdari S, Ganley TJ, Baldwin K, et al: Fixation of displaced midshaft clavicle fractures in skeletally immature patients. J Pediatr Orthop 2011;31(5):507-511.

36. Hosalkar HS, Parikh G, Bomar JD, Bittersohl B: Open reduction and internal fixation of displaced clavicle fractures in adolescents. Orthop Rev (Pavia) 2012;4(1):e1.

37. Gumina S, Salvatore M, De Santis R, Orsina L, Postacchini F: Coracoclavicular joint: Osteologic study of 1020 human clavicles. J Anat 2002;201(6): 513-519.

© 2012 American Academy of Orthopaedic Surgeons

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