Nonoperative Versus Operative Treatment
Nonoperative treatment led to high patient satisfaction for acute thumb UCL injury in 2 studies.23,29 Thirty-two subjects were treated with thumb-spica immobilization (30 were proximal phalanx avulsion fractures). Despite 11 of these patients (34%) remaining symptomatic, 5 remaining clinically unstable, and a 25% (n = 8 patients) nonunion rate, all 32 were satisfied with their clinical outcome (mean, 3 years follow-up). By nature of the definition of chronic UCL deficiency, patients with remote UCL injury have either been untreated or have failed prior nonoperative treatment (for various reasons such as pain, weakness, or instability) and gone on to necessitate surgical intervention. Thus, the latter group of patients (n = 93) was reported separately as chronically UCL-deficient operatively treated subjects' outcomes (Table 3) with attempted prior nonoperative treatment. In these patients, after failure of nonoperative treatment at anywhere from 1 month to more than 6 years, nearly all patients can achieve complete pain relief, normal pinch and grip strength, joint stability, and range of motion after surgical reconstruction. There was no significant difference in patient-specific and injury-specific parameters (subject age, gender, hand dominance, time to treatment, or length of follow-up) between patients with successful and failed nonsurgical treatment (P > 0.05 for each of the compared independent and dependent variables).
Acute Repair for UCL Injury
There were 6 studies that reported clinical outcomes after acute UCL repair using different techniques.20,24–26,28,29 Repair techniques (Table 4) included pullout suture over button with or without Kirschner wire immobilization, suture anchors, soft tissue periosteal suture, and arthroscopic Stener reduction with K-wire. All techniques improved clinical outcomes, including pain, motion, strength, and stability. Significantly better motion and strength and fewer complications were observed with suture anchors and early mobilization versus suture button and cast immobilization (P < 0.05).20 Only 3 patients in these 6 studies had residual laxity. Only 1 study reported significant loss of either MP and interphalangeal joint motion (P < 0.005).25 Except for 2 patients with significant postoperative weakness, full or near-full strength (key pinch and grip) was restored in all studies. Pain reduction was significantly improved in all subjects (P < 0.05).
Autograft Reconstruction for Chronic UCL Deficiency
There were 6 studies that reported clinical outcomes after autograft UCL reconstruction.11,18,19,21,22,27 Reconstruction techniques (Table 5) and grafts included palmaris longus via bone tunnels with or without K-wire MP joint fixation, palmaris longus with suture anchor fixation, iliac crest bone–periosteum–bone graft with cortical screw fixation, and extensor carpi radialis longus bone–tendon ligamentoplasty with titanium screw and suture anchor fixation. No study compared different graft types or fixation techniques. All techniques improved clinical outcomes, including pain, motion, strength, and stability (Table 5). Furthermore, there was no donor site morbidity from autograft harvest sites across all studies. According to the Glickel grading system, 51 excellent (80%) (joint stability not significantly different from unoperated thumb, less than 15% MP joint motion loss, no pain, no ADL limitations, and less than 15% loss of pinch strength), 11 good (17%), and 2 fair (3%) outcomes were observed. Metacarpophalangeal joint instability was either not observed or mild (up to 9 degrees). Key, pulp, and tip pinch and grip strength were either equivalent or only mildly weak compared with the contralateral thumb and hand in all subjects. Metacarpophalangeal joint motion ranged from 79% to 100% compared with the contralateral thumb. When assessed, most patients returned to their preinjury employment. Both x-ray and magnetic resonance imaging evidence confirmed no increase in MP joint osteoarthritis at up to 75 months, postoperatively. Other than 1 postoperative palmaris longus graft rupture requiring MP joint arthrodesis, no significant complications such as neurovascular injury or superficial or deep infection occurred.
There are many ways to manage both acute and chronic thumb UCL deficiency, and controversy persists as to the best treatment options. This systematic review has demonstrated excellent clinical outcomes (pain, strength, motion, and stability) after surgical treatment (repair and autograft reconstruction) of both acute and chronic UCL injury, without any significant difference between repair and reconstruction for acute and chronic injury, respectively. Nonoperative treatment of acute UCL injury (with or without a Stener lesion) frequently fails, leading to chronic pain, instability, and weakness, eventually prompting surgical intervention. Thus, a patient with delayed presentation of UCL injury can still achieve predictably successful outcomes, equivalent to acute repair, with autograft UCL reconstruction. No significant difference in the outcome was demonstrated between different types of autograft used for UCL reconstruction. Complications, failures, and reoperations are rare after surgical treatment of UCL injury.
The major arc of motion of the thumb MP joint is flexion and extension, although there is some abduction, adduction, and rotation.30 The stability of the MP joint derives from joint congruity, the true and accessory collateral ligaments, the volar plate, and the surrounding intrinsic muscles.31 The adductor pollicis supplies active support on the ulnar aspect, whereas the abductor pollicis brevis and flexor pollicis brevis provide dynamic stability on the radial border. The UCL has as its central function maintenance of ulnar stability of the joint, which is paramount for pinch grip. The mechanism of UCL injury is a forced abduction or rotation and hyperextension injury of the thumb at the MP joint.32 The most common region of rupture of the UCL is at the distal insertion or in the distal aspect of the ligament, leaving the proximal stump intact.32 Ulnar collateral ligament injuries can involve injuries to the dorsal capsule, palmar plate, and adductor aponeurosis.33 Avulsion fractures of the ulnar base of the proximal phalanx occur 20% to 30% of the time.17,34 Anywhere from 14% to 64% of UCL injuries have associated Stener lesions, which occur when the adductor aponeurosis is interposed between the ruptured end of the UCL and its site of proximal phalanx attachment.32
Nonsurgical treatment has been advocated for nondisplaced, or minimally displaced avulsion fractures of the UCL either with functional bracing35 or via thumb spica casting or splinting.23,36–38 Kuz et al recommend that most acute avulsion fractures of the thumb UCL be treated nonsurgically, with the exception of displaced fractures with more than 30% articular involvement or bony Stener lesions. Patients who fail nonoperative management have persistent thumb pain, decreased pinch strength, decreased grip strength, limited activities of daily living (especially opening jars and turning keys), continued instability, and early arthrosis.15,39 It is not entirely clear why patients fail nonoperative treatment, but some authors contend that failure may be because of irreducible displacement of the ruptured ligament.15 In patients who had failed nonoperative treatment, who were subsequently taken to surgery, it was found that many of the small avulsion fractures had rotated with the fragment's articular surface rotated out of the plane, precluding fracture healing.15
There is no uniformly agreed on surgical indication for UCL injuries to the MP joint of the thumb. Surgery has been recommended for fracture displacement, significant articular involvement, clinical instability, or fragment rotation.38 Chuter et al40 contend that surgical repair of acute UCL ruptures is the gold standard of treatment in the presence of gross instability, Stener lesions, or displaced avulsion fractures. Ritting et al30 assert that operative management of acute injuries is indicated when the thumb is without an endpoint to valgus stress testing. Surgical treatment has been advocated for all avulsion fractures of the UCL, as the area of articular cartilage is always greater than the fragment size.41 Abrahamsson et al42 maintain that a proximally displaced ligament, palpated proximal to the MP joint, is a more specific indication for surgery.
There is, however, agreement on the treatment goals for repair or reconstruction of the UCL, which are to obtain and maintain an anatomic reduction of the MP joint, reproduce the anatomic origin and the insertion of native ligament, ensure sufficient strength to allow early range of motion, and minimize donor site morbidity if autograft is used.19 Although most surgical undertakings result in good clinical and functional outcomes, there are postoperative complications, including stiffness and decreased range of motion (specifically, restricted flexion at the MP joint), failed reconstruction, infection, neuropraxia, continued pain, implant failure, graft failure, loosening, scarring, and arthrosis.30,43,44 It has been well documented that direct suture techniques fail in chronic injuries.33,45 When repair is attempted, nonanatomical repositioning of the UCL may contribute to the loss of joint motion.46
The limitations of this systematic review are reliant on the studies analyzed. There were considerable differences in the outcomes collected within the studies and between studies, which precluded the performance of a meta-analysis. Furthermore, the lack of patient-specific data precluded advanced statistical calculations, and weighted means from individual studies were the basis for comparison. Although the natural history of chronically untreated UCL injury eventually leads to pain and loss of function, surgery intervened in the studies present. Thus, the true natural history is yet unknown. Only prospective studies can determine this injury course. Selection bias was presented based on the variance in subject age, gender, hand dominance, injury chronicity, injury location, the presence or absence of bony avulsion, the presence or absence of Stener lesion, and the retrospective nature of most of the studies. There is also significant performance bias, as there are multiple different methods of treatment, providers, graft, suture, and fixation types, as well as methods and duration of immobilization. Transfer bias was present in the difference of length of follow-up, despite a minimum of 2 years, and the proportion of subjects who enrolled and completed that which was actually followed up. Detection bias was present in the inconsistent use of an invalidated outcomes tool (Glickel grading system), visual measurement of range of motion, different tools for strength and stability measurement, and the subjective nature of reporting weakness and stability. Further detection bias existed in that not all studies used each clinical outcome (eg, Glickel grade) or radiographic measure postoperatively. Furthermore, it is interesting that our study quality results using the Quality Appraisal Tool were as low as they were (mean 54% with a range of 33%-79%). The original study using this tool had a mean quality score range of 25% to 96% but had more than half of the studies scoring >75%.16 Despite these study limitations, this systematic review is strong in that it analyzes the largest number of studies and subjects in the literature managed with both nonoperative and operative means for acute and chronic UCL injury.
This systematic review has demonstrated excellent clinical outcomes (pain, strength, motion, and stability) after surgical treatment (repair and autograft reconstruction) of both acute and chronic UCL injury, without any significant difference between repair and reconstruction for acute and chronic injury, respectively. Nonoperative treatment of acute UCL injury (with or without a Stener lesion) frequently fails, leading to chronic pain, instability, and weakness, eventually prompting surgical intervention. Complications after surgical treatment of UCL injury are rare.
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Keywords:© 2013 by Lippincott Williams & Wilkins
gamekeeper's thumb; skier's thumb; stener lesion; ulnar collateral ligament