Osteitis pubis is the result of repetitive twisting and cutting movements that initiate a lytic response in bone at the pubic symphysis (4). This area of bone lysis can be visualized on bone scan and MRI. The para-articular bone edema is remote from the attachment of the adductors (4). Adductor dysfunction has been identified as microtears, which presents itself as a more frequent MRI finding than osteitis pubis and therefore most likely precedes the development of osteitis pubis (4,22). Pain is located at the symphysis pubis or medial groin that intensifies when hip adduction is resisted (1). The bony stress reaction of osteitis pubis is similar to the palpable tenderness of the medial border of the tibia in tibial stress syndrome (30).
There are 4 stages of clinical presentation of osteitis pubis described by Rodriguez et al. (23). Stage 1 is groin pain on the kicking side that subsides during warm-up but reappears after training. Stage 2 is bilateral, inguinal, and adductor pain that is increased after training. Stage 3 is bilateral, inguinal, adductor, and abdominal pain with kicking, sprinting, changing direction, moving from sitting to standing, and with prolonged walking. At this stage, the athlete is unable to train or play. Stage 4 is adductor and abdominal pain that is referred to the lumbopelvic region with the Valsalva maneuver and other sources of increased intra-abdominal pressure (defecation, coughing, sneezing, and walking on uneven surfaces). Activities of daily living cause symptoms (23).
Pizzari et al. (22) identified some possible internal and external risk factors in the Australian Football League for the development of osteitis pubis. Internal risk factors include immature skeleton, hypermobility (generalized ligamentous laxity), inability to recruit appropriate muscles for stability and function, intrapelvis asymmetry, and technique deficits. External risk factors included training intensity, training volume, kicking, trauma, change of direction, recovery time, ground hardness, and number of games played. Prevention programs are widely used and successful, which focus on tight joint and muscles around the trunk, pelvis, and lower extremities (22).
SPORTS HERNIAS/ATHLETIC PUBALGIA
The term sports hernia has been poorly defined in the literature. “Gilmore's Groin” was defined by a dilated superficial inguinal ring with the possible additional pathology of a torn external oblique aponeurosis, torn/disrupted conjoined tendon, and a dehiscence between the conjoined tendon and inguinal ligament (19). The “sportsman” hernia is defined as a bulge in the posterior inguinal wall that represents an incipient inguinal hernia or a tear in the transversalis fascia in the posterior inguinal floor (19). Medical professionals and literature refer to sports hernia and athletic pubalgia interchangeably. There has been a movement to replacing the term sports hernia to athletic pubalgia because of the lack of a true hernia. For the time being, they can continue to be used interchangeably (15).
It has been hypothesized that an imbalance in the hip adductor and lower abdominal musculature leads to a weakening, laxity or tearing of the structures in the inguinal region that results in the physical examination finding of tenderness over the inguinal canal and conjoined tendon that is worsened by a resisted sit-up (1,16). A sports hernia is therefore a term applied to a variety of different anatomical causes of groin pain. A sports hernia does not involve a true herniation of intestine and tends to imply that the treatment should be the same; however this is not the case (15). The theory around the connection between the rectus abdominis and the adductor dysfunction is that rectus abdominis weakness leads to an overcompensation by the adductors, resulting in a compartment-like syndrome as the anterior tilt of the pelvis increases that compresses the adductor compartment (5).
There may be around 20 syndromes of anatomic deficit combinations that fall under the umbrella term athletic pubalgia/sports hernia (15). Any adductor muscle can be involved (gracilis, adductor magnus, obturator externus, adductor longus, adductor brevis, and/or pectineus) (15). Most commonly the rectus abdominis with or without the adductor longus/pectineus is involved; however the sartorius, iliopsoas, or rectus femoris may be the source of dysfunction (15).
Symptoms are typically vague and gradual in onset over 1-6 months (5). The pain can be exacerbated by coughing, straining, twisting, turning, pivoting, or palpating (5). Physical examination of sports hernia reveals pain with resisted sit-up, resisted hip adduction, and/or focal tenderness at the pubic attachment of the rectus abdominis and adductor longus or at the external/superficial inguinal ring (21).
Treatment is usually initially conservative including rest, nonsteroidal anti-inflammatories, massage, physical therapy, and/or oral or injected corticosteroids (5). Defects in the inguinal region have been repaired by conventional surgical methods for inguinal hernias aimed at strengthening the inguinal defect specifically around the internal inguinal ring including placement of a mesh (19). Occasionally, during surgical exploration of a suspected sports hernia, a small inguinal hernia will be found and repaired, leading to an alleviation of symptoms (19). Physical therapy designed to increase pelvic stability can reduce symptom recurrence (5). The treatment with mesh may stabilize the superficial inguinal ring, which in turn may address the rectus abdominis-adductor longus aponeurosis indirectly (21).
Other surgeons have advocated the use of a different approach to treatment termed a “pelvic floor repair.” The pelvic floor muscles anatomically are the coccygeus and levator ani with the main action to support the pelvic viscera and resist increases in intra-abdominal pressure (17). The pelvic floor repair involves reattaching the inferolateral margin of the rectus abdominis to the fascia that overlies the anterior pubic ligament and anterior pubis (5,16). Other repairs have focused on surgical repair of possible entrapped nerves (ilioinguinal or genital branch of genitofemoral nerve) (21). There is currently no general consensus on the best surgical approach to repair of a sports hernia.
If there is a microtear present in the adductor attachment to the pubis, symptoms should resolve after a corticosteroid injection to the symphyseal cleft. If refractory to therapy, a surgical tenotomy where the adductor tendon is divided from the pubic attachment can be performed (4). A tenotomy may be protective of a pelvic floor repair (19). No intervention is done to the muscle body (5). Approximately 60% of athletes may potentially return to play in 3 months after the tenotomy (21). A tenotomy alone may not prevent progressive injury or address the underlying instability about the pubic area (21).
EXERCISES TO PREVENT PELVIC IMBALANCE
Strength and conditioning professionals can create programs that focus on the prevention or correction of biomechanical imbalance of the anterior pelvic tilt to reduce the risk of sports hernias and osteitis pubis (Table 2). These programs should focus on abdominal strength and hip flexibility, while still incorporating power, strength, and dynamic flexibility in the lower extremities. These exercises and stretches serve as potential prehabilitation for osteitis pubis and sports hernias. Prehabilitation is defined as using specific exercise programs to prevent injury (29). Preventive exercise programs have been used successfully in Australian Football League for osteitis pubis (22). No specific recommendations are given for a prehabilitation or preventive program. However, exercises are rather suggested to be included in a general strength and conditioning program (Table 2). A focus on strengthening of the abdominals, hamstrings, hip abductors, and hip adductors with flexibility of the hip adductors and hip flexors have been suggested. Sample exercises have been given (Table 2).
Strength and conditioning programs prescribed for athletic activities with excessive twisting and turning should be balanced to ensure that the lower-body and abdominal musculature maintain the correct biomechanical alignment. To achieve this, stretching activities for the lower body must be completed both statically and dynamically. The abdominal muscles must also be exercised to ensure strength to balance any strength gains in the lower-body muscles. In a balanced program, the goal is to strengthen and increase flexibility while reducing risk of injury because of biomechanical imbalance. Table 2 contains specific exercises that can be incorporated into the exercise program to ensure a balanced routine. The dynamic warm-up should focus on dynamic flexibility of the hip adductors and flexors. The strength and conditioning professional should design a personalized warm-up program for the following activity whether it is practice, weight training, or a game. A sample program is included in Table 2. Other exercises can also be incorporated into a routine that strengthen or stretch the correct muscle groups; however, the strength and conditioning professional must focus on proper form to attain the maximal result from the exercise program. If activities are performed incorrectly, injuries are less likely to be prevented and the exercise program may cause injury.
When determining appropriate exercises for the abdominals in regards to the anterior pelvic tilt, osteitis pubis, and sports hernias, it is important to include exercises that activate the upper and the lower abdomen. Sarti et al. (24) in 1996 reported that abdominal crunch produces greater activity by the upper portion of the rectus abdominis, whereas the posterior pelvic tilt exercise is more strenuous on the lower portion of the rectus abdominis. However, Lehman et al. (14) in 2001 reported that difference in the portions of the rectus abdominis may lack clinical or therapeutic importance. Abdominal curl-up/crunch can be performed without activation of the hip flexors, therefore minimizing the anterior pelvic tilt (8). The posterior pelvic tilt exercise is important because it will lengthen the muscles of the erector spinae and stretch the quadriceps (11).
When performing all exercises, proper positioning of the pelvis is important. An abdominal drawing-in maneuver is an effective method to promote gluteus maximus and medial hamstring activation from the erector spinae muscles when the athlete is in prone position (20). It can be performed during most exercises to create a more rigid cylinder around the spine by contracting the transverse abdominis (6). This maneuver can be done during all exercises, but it is very important for squats. The athlete should be instructed to try to “draw-in” the abdominal wall without moving the spine or pelvis (6) or by having the patient bring their umbilicus superiorly and toward the spine (9). If squats are performed during the general program, care should be taken to instruct the athletes to avoid an excessive anterior pelvic tilt to reduce the workload on the erector spinae. Electromyogram activity in the erector spinae is greater when squats are performed with an anterior pelvic tilt (10).
Preventing unwanted lumbar spine and pelvic movement allows the Romanian dead lift (RDL) and modified extension to focus on the hamstrings and gluteus maximus rather than the activation of the erector spinae. Activation of the erector spinae muscles actually promotes the anterior pelvic tilt (20). If the RDL or modified extension is performed incorrectly, there will be tightening of the paraspinal muscles and will go directly against the goal of preventing the anterior pelvic tilt. The anterior pelvic tilt has been postulated to be more important than stretching the hamstring for improving hamstring flexibility (26), and this leads to the necessary inclusion of hamstring strengthening exercises because if individuals have an anterior pelvic tilt, the hamstrings will usually be more flexible.
Although the dysfunction of sports hernias and osteitis pubis is related to the adductors, exercises in a general program must be done to strengthen these muscles. In preventing sports hernias and osteitis pubis, stretching the adductors are important. This can be done by the 4-point stretch, active isolated long adductor stretch, and active isolated short adductor stretch (Table 2). Because strengthening the adductor muscles reduces the occurrence of other common adductor injuries (21), it is recommended that adductor strengthening exercises be performed in a balanced way with abductor exercises. For this reason, Table 2 includes abductor exercises.
Sports hernias and osteitis pubis are causes of groin pain in athletes and result in a significant loss of time from sports activities. These conditions result from inflexible lower extremity muscles that are excessively strengthened in comparison with the abdominal musculature, which leads to the anterior pelvic tilt. Sports hernias are the result of damage to the fascial structure of the inguinal region leading to abdominal wall laxity combined with adductor/hip flexor dysfunction. Osteitis pubis is a lytic bone response to forceful adductor movements. Both sports hernias and osteitis pubis have been proposed to occur because of some degree of adductor dysfunction due to lack of flexibility (4).
A strength and conditioning program must contain the appropriate ratio of abdominal exercises to lower extremity exercises to reduce the incidence of anterior pelvic tilt and other pelvic imbalance disorders. A focus is made on an exercise prescription to strengthen the abdominals, hamstrings, hip extensors, and hip abductors, while stretching the hip adductors and hip flexors. These exercises and stretches can help to offset the intrinsic tendencies in some sports to develop an anterior pelvic tilt. The strength and conditioning professional should include these exercises and stretches in any program design. The biomechanical alterations associated with an anterior pelvic tilt may increase the likelihood of sports hernias and osteitis pubis. By incorporating both strengthening and flexibility exercises, the strength and conditioning professional may help athletes reduce the specific risk of developing sports hernias and osteitis pubis.
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Keywords:© 2010 National Strength and Conditioning Association
prehabilitation; sports hernia; groin pain; pelvic imbalance; osteitis pubis; athletic pubalgia