[ case report ] PAULA M. YAZBEK, PT1 • VANESSA OVANESSIAN, PT, MS1 • ROBROY L. MARTIN, PT, PhD2 • THIAGO Y. FUKUDA, PT, PhD3 Nonsurgical Treatment of Acetabular Labrum Tears: A Case Series I nterest in the etiology, diagnosis, and treatment of individuals with acetabular labral tears continues to increase. While there is available information for arthroscopic and postoperative management of labral tears, femoroacetabular impingement (FAI), and hip instability,4,6,8,9,28,32 there is limited research regarding appropriate nonsurgical physical therapy intervention for those with suspected labral tears. As we become more aware of intra-articular hip pathologies, information to help guide nonoperative rehabilitation programs is needed. Mechanical impingement and/or instability of the femoroacetabular joint are believed to be common causes of labral TTSTUDY DESIGN: Case series. TTBACKGROUND: While the literature has em- phasized surgical treatment of acetabular labrum tears, there is a lack of information regarding conservative treatment. The purpose of this case series was to describe a nonsurgical program for those with clinical evidence of an acetabular labrum tear, that emphasized hip and lumbopelvic stabilization, correction of hip muscle imbalance, biomechanical control, and sport-specific functional progression. TTCASE DESCRIPTION: The 4 patients in this se- ries had clinical evidence and magnetic resonance imaging confirmation of an acetabular labrum tear and underwent a similar treatment protocol consisting of 3 phases. Phase 1 emphasized pain control, education in trunk stabilization, and correction of abnormal joint movement. Phase 2 focused on muscular strengthening, recovery of normal range of motion (ROM), and initiation of sensory motor training. And phase 3 emphasized advanced sen- chondral pathology.3,11,22,28 The 2 primary types of femoroacetabular impingement (FAI) are cam and pincer impingement. Cam impingement originates from abnormal thickening of the femoral headneck junction, while pincer impingement sory motor training, with sport-specific functional progression. ROM, flexibility, pain, special tests, and level of function were assessed, and strength was measured with handheld dynamometry. TTOUTCOMES: All patients demonstrated decreased pain, functional improvement, and correction of muscular imbalance. Increased muscle strength, primarily for the hip flexors (1%-39%), abductors (18%-56%), and extensors (68%-139%) was also noted. TTDISCUSSION: All patients responded well to our program. This case series suggests that patients with clinical evidence of an acetabular labral tear confirmed with MRI can show meaningful improvement with nonsurgical intervention. TTLEVEL OF EVIDENCE: Therapy, level 4. J Orthop Sports Phys Ther 2011;41(5):346-353, Epub 18 February 2011. doi:10.2519/jospt.2011.3225 TTKEY WORDS: acetabulum, hip, labrum, rehabilitation originates from overcoverage of the acetabulum.10 Clinical signs of FAI have been found to be present in up to 95% of patients with a labral tear.5 The anteriorsuperior region of the joint is the most common location for a labral tear,33 the patient symptoms of which are provoked by combined hip internal rotation, adduction, and flexion.28 Labral chondral lesions may also result from atraumatic hip instability, with or without mechanical impingement. Focal rotational instability is defined as localized laxity of select capsule-ligamentous structures that results from repetitive forceful hip rotation.22,29,31 The most common injury mechanism is excessive hip external rotation, leading to iliofemoral ligament laxity.22,31 Abnormal loading of the anterior-superior labrum can occur in the presence of instability.29 The labrum is important for joint stability and, therefore, capsule-ligamentous structures can come under additional stress when a labral tear occurs. Forceful loading of the hip joint may further compromise the integrity of not only the passive stabilizing structures but the active joint stabilizers. Poor neuromuscular control of the hip and lumbopelvic regions may, therefore, exacerbate the pathology and symptoms associated with instability. Pathologies that affect the neuromuscular control of hip musculature can disrupt movement patterns and alter forces across the labrum and articular carti- Staff Physical Therapist, Irmandade da Santa Casa de Misericórdia de São Paulo, Rehabilitation Service, São Paulo-SP, Brazil. 2Associate Professor, Department of Physical Therapy, Duquesne University, Pittsburgh, PA; Staff Physical Therapist, University of Pittsburgh Centers for Sports Medicine, Pittsburgh, PA. 3Doctoral candidate, Associate Professor, Staff Physical Therapist, Irmandade da Santa Casa de Misericórdia de São Paulo, Rehabilitation Service, São Paulo-SP, Brazil. This work received approval from the Institutional Review Board of Irmandade da Santa Casa de Misericórdia de São Paulo. Address correspondence to Dr Thiago Yukio Fukuda, Physical Therapy Department, Rua Dr Cesário Motta Jr, 112, 01221-020, São Paulo-SP, Brazil. E-mail: tfukuda10@yahoo.com.br 1 346 | may 2011 | volume 41 | number 5 | journal of orthopaedic & sports physical therapy 41-05 Yazbek.indd 346 4/20/2011 2:30:12 PM TABLE 1 Patient Information Patient Age, y Gender 1 27 Male Relevant History Complaints MRI Findings • Professional indoor soccer player • Groin and lateral knee pain of the involved side • Pincer femoroacetabular impingement • Partial labral resection 10 mo earlier • Pain increased with walking, going up and down stairs, • 10 unsuccessful previous physical therapy sessions running, and changing direction • Duration of symptoms, 2 y • Arthroscopic knee surgery 5 y ago 2 24 Male • Professional Jiu-Jitsu fighter • Groin and medial thigh pain of the involved side • Anterior superior labral tear • Duration of symptoms, 9 mo • Bilateral adductor tendinitis • Superior lateral chondral lesion 3 24 Female • Sedentary • Groin pain of the involved side • Anterior superior labral tear • Locking after periods of sitting • Partial ligamentum teres tear • Thigh pain with standing • Gluteal medius and minimus tendinopathy • Duration of symptoms, 1 y • 10-d history of lateral leg paresthesia 4 24 Male • Recreational soccer player • Groin and right thigh pain • Partial anterior superior labral tear • Mild L5-S1 degenerative disc disease • Pain increased with sitting and soccer-related activities • Normal electromyography tests • Duration of symptoms, 3 y Abbreviation: MRI, magnetic resonance imaging. lage.25 Gait deviations resulting from abnormal recruitment patterns of the hip musculature have been documented in individuals with FAI.14 Also, decreased force contribution from the gluteal muscles during active hip extension and iliopsoas during active hip flexion was found to result in greater anterior hip forces.20 Gluteus medius function is thought to be commonly impaired in those with hip pathology.8 Though compensation with excessive hip internal rotation can enhance gluteus medius function, it can negatively impact force generation of the gluteus maximus. Abnormal internal rotation may also increase anterior hip forces.36 If force-producing capacity and control of the muscles around the hip are improved, anterior hip forces and, therefore, hip pain may potentially be reduced in those with labral or chondral lesions. Although there is limited information regarding nonsurgical treatment of those with clinical evidence of a labral tear, interventions that attempt to normalize hip alignment and correct joint movement may be beneficial. The use of a hip-strapping device to reduce frontal plane (adduction) and transverse plane (internal rotation) hip kinematics was found to decrease pain and improve function in a female individual with FAI.2 Lewis et al20 described a program that attempted to reduce stress on the anterior hip joint by improving force production of the gluteus medius, piriformis, gemellus, obturators, gluteus maximus, and iliopsoas, while minimizing excessive quadriceps femoris and hamstring activity. Key elements of this program address positional and movement control, muscle force-generating capacity, muscle length, and activity modification.20 Anecdotally, it has been reported that modifying muscle recruitment and movement patterns during gait and functional activities is helpful. However, further investigation and descriptions of conservative intervention programs are needed. The conservative program outlined in this study emphasized hip and lumbopelvic stabilization, correction of hip muscular imbalance, biomechanical control, and sport-specific functional progression. The aim of this paper was to report the outcome of 4 patients, as well as to describe the nonsurgical treatment protocol. This work received approval from The Institutional Review Board of Irmandade da Santa Casa de Misericórdia de São Paulo, and all participants gave informed, written consent prior to participation. CASE DESCRIPTION T he 4 patients in this case series were evaluated at baseline, and at 4 months and 6 months after treatment. For each patient, demographic, relevant history, primary symptoms, and results of magnetic resonance imaging (MRI) are provided in TABLE 1. Evaluation consisted of an assessment of range of motion, flexibility, pain, and level of function as assessed with the Lequesne Hip Score.17 Strength assessment was measured with handheld dynamometry.1 Potential sacroiliac joint, radiculopathy, piriformis, and anterior pelvic involvement were assessed, respectively, with the squish test (posterior pelvic pain during anterior-posterior pressure applied on the iliac bone), Lasegue’s straight-leg maneuver, the piriformis test (buttock or sciatica pain during hip medial rotation), and the grava test (pain during hip journal of orthopaedic & sports physical therapy | volume 41 | number 5 | may 2011 | 347 41-05 Yazbek.indd 347 4/20/2011 2:30:13 PM [ adductors and abdominal contraction in prone position).7 The following special tests for intra-articular hip pathology were also performed: flexion-adduction internal rotation impingement,18 Patrick or flexion-abduction external rotation (FABER),27 scour (pain during pressure applied down through the thigh into the hip joint, over a hip range of motion), and internal rotation (groin pain during passive hip internal rotation).21 The results of these tests are provided in TABLE 2. Additionally, we tested the presence of femoral anteversion, according to the method described by Souza and Powers.34 None of the 4 patients presented with femoral anteversion; however, 1 patient showed a decrease of 15° in hip internal rotation in relation to the opposite limb. Only patients with clinical evidence of an acetabular labrum tear were included in the study. This includes patient 1, who, despite a previous partial labral resection, showed signs of FAI with continued labral involvement. As noted in TABLE 1, 3 of the 4 patients participated in sports, with 1 being sedentary. All 4 individuals had MRI findings consistent with a labral tear. Additionally, all 4 patients had some positive signs and symptoms that would suggest a labral tear as a potential pathology. All 4 patients might have had concurrent extra-articular pathology, as well, which might have partially contributed to their complaints. Although case 1 presented with a status of post partial labral resection, his symptoms, examination, and diagnostic testing suggested FAI with continued labral involvement as a potential pathology. Nonsurgical Treatment Protocol The conservative treatment protocol (TABLE 3) was developed for those with clinical evidence of an acetabular labrum tear and modified as needed for coexisting pathologies. Phase 1 consisted of pain control, education in trunk stabilization, and correction of abnormal movement. Patients also received instruction to correct excessive dynamic valgus of the lower case report TABLE 2 ] Results of Clinical Tests and Functional and Pain Scales for the Initial Evaluation and Re-evaluations (Discharge of Therapy) Before Patient/Special Tests Involved After Uninvolved Involved Uninvolved Patient 1 Impingement + – + – Patrick-FABER + – – – Scour + – + – Internal rotation + – – – Squish – – – – Lasegue – – – – Piriform + – – – Grava + – – – VAS* 5 0 Lequesne† 10 5 Patient 2 Impingement + – – Patrick-FABER – – – – – Scour + – – – Internal rotation – – – – Squish + – + – Lasegue – – – – Piriform – – – – Grava – – – – VAS* 4 0 Lequesne† 5 1 Table continues on page 349. extremity, with dynamic valgus defined as hip adduction and internal rotation that increased during single-limb support.30,33 Once a patient noted diminished pain with improved control of trunk stabilization and dynamic valgus, the patient could progress to phase 2. Phase 2 (FIGURE 1) focused on muscle strengthening, recovery of normal range of motion (ROM), and initiation of sensory motor training. The 4 patients in this report demonstrated muscular imbalance of the lower limbs, as demonstrated by differences in strength measurements between limbs. Once this imbalance was corrected (when the injured limb reached or exceeded the strength of the healthy limb), patients could progress to phase 3 (FIGURE 2), which emphasized advanced sensory motor training, with sport-specific functional progression. Proper lower extrem- ity alignment and stabilization were encouraged at all times during activity. OUTCOMES S pecial test results and pain levels are included in TABLE 2. The results of the strength assessments are provided in TABLE 4. All patients received 3 treatment sessions per week and were progressed through the 3 phases of the proposed protocol, in accordance with the outlined criteria. Each patient generally progressed well through the treatment program. It should be noted that in patient 1, despite the partial acetabular labrum resection, symptoms continued. Biomechanical instability might have contributed to the patient’s prior lack of progress. This previous lack of progress might also have 348 | may 2011 | volume 41 | number 5 | journal of orthopaedic & sports physical therapy 41-05 Yazbek.indd 348 4/20/2011 2:30:14 PM TABLE 2 Results of Clinical Tests and Functional and Pain Scales for the Initial Evaluation and Re-evaluations (Discharge of Therapy) (continued) After Before Patient/Special Tests Involved Uninvolved Involved Uninvolved Patient 3 Impingement + – + – Patrick-FABER – – – – Scour – – – – Internal rotation + – – – Squish – – – – Lasegue + – – – Piriform + – – – Grava – – – – VAS* 6 0 Lequesne† 7 1 Patient 4 Impingement + – – – Patrick-FABER + – + – Scour + – + – Internal rotation + – – – Squish + – – – Lasegue + – + – Piriform + – + – Grava – – – – VAS* 10 3 Lequesne† 14 5 Abbreviation: VAS, visual analog scale. *0- to 10-cm scale, where 0 means “no pain” and 10 means “worst imaginable pain.” † 0 to 22 points, where 0 means “normal function” and 14 or more points means “extremely severe dysfunction.” been due to symptoms arising from FAI, as opposed to an isolated labral tear. For this patient, it was not possible to quantify hip strength on initial evaluation, because the dynamometer was not available. This patient progressed to phase 2 after 2 weeks, phase 3 after 4 weeks, and was discharged after a total of 12 weeks of treatment. Patient 2 progressed through the strengthening and functional-training activities relatively quickly, once pain was reduced. Being a professional athlete might have contributed to this patient’s rapid progress. He was able to progress to phase 2 after 2 weeks and phase 3 after 4 weeks. Following discharge, after a total of 9 weeks of treatment, the patient was able to start a new competitive season. Patient 3 presented with gluteal medius and minimus tendinopathy, in addition to a potential labral tear, which was addressed with laser and electrical stimulation included in the intervention plan. According to our clinical experience, both physical agents work well for tendinopathy in inferior limbs and focus especially on pain relief. It was felt that the tendinopathy did not influence efforts to correct muscular imbalances. Patient 3 started phase 2 after 5 sessions, with no pain or paresthesia. She progressed to phase 3 after 5 weeks. Once dynamic valgus control was maintained, she noted that the locking episodes were no longer present. She was discharged after 13 weeks of treatment, with her only complaint being slight hip pain after wearing high-heeled shoes for prolonged periods. At the 6-month follow-up evaluation, the patient had returned to her normal daily activities but had not done any sportsrelated activities. Patient 4 was unique, in that he was the only case to present with decreased hip internal rotation range of motion (right, 40°; left, 25°). Regaining this loss of motion was emphasized and addressed with joint mobilization techniques. The patient was able to progress to phase 2 after 3 weeks and phase 3 after 6 weeks. After 4 months of treatment, he was discharged with normal range of motion and symptom improvement. DISCUSSION N onsurgical treatment for individuals with suspected acetabular labral tears has not been described. This case series outlines a conservative treatment program for individuals with clinical evidence of an acetabular labral tear, confirmed with MRI, that emphasized hip and lumbopelvic stabilization. Over a 12-week period, the 4 patients who participated in this program noted decreased pain, increased strength, and improved function. As noted in TABLE 2, after the treatment sessions, all patients reached a normal to moderate limitation of function, according to the Lequesne Hip Score. The Lequesne Hip Score was chosen because this scale was easily applicable and can be used to assess level of disability. According to this scale, the level of handicap can be interpreted as follows: none (0 points), mild (1-4 points), moderate (5-7 points), severe (8-10 points), very severe (11-13 points), and extremely severe (14 or more points). Although the Lequesne Hip Score has not undergone psychometric testing to provide minimal clinically important difference (MCID) for changes in score, improvements in scores journal of orthopaedic & sports physical therapy | volume 41 | number 5 | may 2011 | 349 41-05 Yazbek.indd 349 4/20/2011 2:30:15 PM [ case report ] Rehabilitation Protocol for Nonsurgical Treatment of Acetabular Labrum Tears TABLE 3 Parameter Phase 1 Phase 2 Phase 3 Progression criterion • Diagnosis of acetabular labrum tear • Significant decrease or absence of pain • Good balance and proprioception and normal complaint (VAS*, <4, or Lequesne†, <5) Gait • Assistive device for those with increased pain muscle strength and range of motion • Discontinue assistive device with weight bearing Pain • Maitland’s manual mobilization (grades 1 and 2) • Electrophysical agents: electrical stimulation and laser AROM • Active movements within painful limits • Maitland’s manual mobilization (grades 3 and 4) and combined movements • Pelvic rotation maneuver • Sacroiliac distraction Segmental stabilization • Transversus abdominis and multifidus isolated • Core (lumbopelvic stabilization exercises) added • Core (lumbopelvic stabilization exercises) added contraction and associated light exercises, such to moderate exercises, such as lateral bridge and to Swiss ball exercises and advanced sensory as bridging and crouching close to the floor on mini squat, and to light sensory motor training motor training hands and knees Muscle strength • Standing hip flexion and extension (progressive load), 3 × 10 reps • Muscle strength maintenance (progressive load) and address any persisting muscular imbalance • Standing hip abduction and adduction, with elastic resistance near a support bar (progressive load), 3 × 10 reps • Lunge (progressive load), 3 × 10 reps • Shuttle machine (progressive load), 3 × 10 reps, 70% MR • Knee flexion-extension on chair (progressive load), 3 × 10 reps, 70% MR • Sidestepping gait with an elastic band over midfeet, 3 × 1 min • Dynamic valgus control with single-limb squat, 3 × 1 min Sensory motor training • Balancing • Same equipment used in phase 2, combined • Balance board with sports movements (eg, kicking and • DynaDisc throwing) • Jumping board Abbreviations: AROM, active range of motion; MR, maximal repetition; VAS, visual analog scale. *0- to 10-cm scale, where 0 means “no pain” and 10 means “worst imaginable pain.” † 0 to 22 points, where 0 means “normal function” and 14 or more points means “extremely severe dysfunction.” obtained by this instrument were accompanied by decreased pain and increased strength. Three patients had total pain relief, as measured with a visual analog scale, and all patients showed improved muscle strength of the hip flexors (1%39%), abductors (18%-56%), and extensors (68%-139%). On initial evaluation, lower limb strength imbalance was identified in the patients. Gluteus medius, gluteus maximus, and iliopsoas weakness can contribute to increased anterior hip force. This weakness, combined with hip hyperextension, may be a contributing factor for an acetabular labrum tear.5,25,26 We have noted that patients with gluteus maximus, gluteus medius, and iliopsoas weakness can report hip instability (anterior discomfort when performing activities that require active extension, along with hip external rotation). Gluteus medius and maximus weakness can also lead to abnormal lower extremity positioning associated with excessive lower extremity dynamic valgus (ie, femoral adduction and internal rotation).30 In dynamic valgus, the hip is in a position that can cause or aggravate symptoms associated with a labral tear. The improvement that 350 | may 2011 | volume 41 | number 5 | journal of orthopaedic & sports physical therapy 41-05 Yazbek.indd 350 4/20/2011 2:30:16 PM FIGURE 1. Phase 2 of rehabilitation protocol. (A) Gluteus maximus strengthening on equipment, (B) side-stepping using an elastic band around both midfeet, which promotes greater concentric and eccentric hip abduction and external rotation effort, and (C) control of dynamic valgus on a trampoline. FIGURE 2. Phase 3 of rehabilitation protocol. (A) Core stabilization with perturbation forward, backward, and side-to-side, (B) single-limb sliding on straight board while controlling dynamic valgus, (C) sitting on Swiss ball, performing isometric hip adduction and ball throws, (D) Jiu-Jitsu sport movement with elastic resistance for hands and feet, and (E) movements with lower limbs holding a Swiss ball between legs. patients achieved as a result of this program may be attributed to the increase strength in the muscles that help to decrease anterior hip forces, as well as to control dynamic valgus. The treatment protocol outlined in this manuscript is focused on hip muscle imbalance and correction of abnormal biomechanics, and adds a more specific exercise prescription than the previously described program.19 Kapandji13 noted a direct relationship between abductor weakness of the involved limb and adductor weakness of the contralateral limb. The author labeled these findings as “cross-chain weakness.” During double-limb support, the pelvis is balanced by simultaneous and bilateral action of the hip abductors and adductors. When these antagonistic actions are balanced, the pelvis is stable in a symmetrical position.9,36 When cross-chain weakness is present, the dynamic stability of the pelvis is impaired. This dynamic instability can contribute to an overload of the capsule, potentially leading to labral or chondral pathology.9 During single-limb standing, the pelvis is balanced by the action of the ipsilateral abductors. The gluteus medius is primarily responsible for maintaining this balance, with contribution from the gluteus minimus and tensor fascia lata. When abductor weakness occurs, the effect of gravity may not be conterbalanced, causing the hip to move into adduction. This cross-chain weakness was best observed in patient 3. This patient had hip extensors, hip abductors, and hip flexors weakness on the involved limb, with significant weakness of the adductors in the contralateral limb. Handheld dynamometry allowed for close monitoring of muscle imbalance during strengthening exercises. In the correction of abnormal mechanics, it was considered critical to strengthen those muscles identified as weak. At the beginning of treatment, the primary objective was to instruct patients on the importance and techniques for proper lumbopelvic and hip stabilization, especially for athletes.6,36 At the same time, analgesic methods were used to reduce pain. Stabilization during movement requires normal muscle activation patterns for proper movement coordination. It is debated whether joint instability or impaired coordinated movement is a source of dysfunction. Adequate joint stability depends on contractile and noncontractile elements. Therefore, improper coordination of movement patterns may play a large role in whether or not a patient experiences symptoms related to instability.15 Studies have determined that, in healthy people, pelvic postural control during lower limb exercises occurs through the simultaneous contraction of local and global muscles.12 In contrast, it was found that multifidus and transversus abdominis activation was impaired in individuals with pelvic injuries.35 Activities to improve recruitment, activation, and timing of deep lumbopelvic muscu- journal of orthopaedic & sports physical therapy | volume 41 | number 5 | may 2011 | 351 41-05 Yazbek.indd 351 4/20/2011 2:30:19 PM [ ] Muscle Strength Using Handheld Dynamometer for Initial Evaluation and Discharge From Therapy* TABLE 4 case report Evaluation, kg Involved Re-evaluation, kg Uninvolved Involved Uninvolved Change, % Involved Uninvolved Hip flexors Case 2† 41.9 46.4 52.3 57.4 25 24 Case 3† 19.5 22.8 19.6 22.8 1 0 Case 4‡ 17.5 22.2 24.0 24.0 39 7 Hip extensors Case 2† 18.3 16.2 36.3 38.7 98 Case 3† 11.1 18.0 18.7 18.0 68 139 0 Case 4‡ 20.2 26.4 NA NA NA NA Hip abductors Case 2† 28.8 29.6 28.8 29.6 0 0 Case 3† 7.5 10.9 11.7 15.9 56 46 Case 4‡ 10.8 12.7 14.8 15.0 37 18 Hip adductors Case 2† 13.4 11.3 13.4 15.6 0 38 Case 3† 9.1 7.2 12.3 11.4 35 58 Case 4‡ 17.7 18.3 17.7 18.3 0 0 Abbreviation: NA, not evaluated. *There are no values of case 1 because during his evaluation the dynamometer was not available yet. † 6-month re-evaluation. ‡ 4-month re-evaluation. lature, transversus abdominis, and multifidus were implemented early in our program to improve movement coordination. The goal during all our activities was to have the patients activate these deep muscles before and during the activation of muscles that produce hip motion. It is the authors’ opinion that not only is this specific muscle strength training important to dynamic posture maintenance and control but also important for progressive sensory motor control. This was implemented in our protocol by first emphasizing lumbopelvic and hip stabilization, before progressing to functional activities. Visual feedback was provided to the patients throughout the progression of activities and was considered a key component in teaching and learning dynamic stabilization. But it should be noted that the passage of time might have contributed to some or all of the patients’ improvement. However, this is considered unlikely, given the long duration of symptoms in our patients. There is limited ability to accurately clinically diagnose a labral tear.16,22-24 In addition, even for patients with a confirmed labral tear on diagnostic imagining, it does not ensure that the pain arises from the tear.23 Therefore, we chose to use the term “clinical evidence of a labral tear” for our patients. The difficulty with the diagnostic process should not affect the interpretation of this study. The purpose of this paper was not to describe the diagnostic process but to describe a rehabilitation protocol that could be implemented for those with suspected hip labral tears. CONCLUSION T his article reported on patients with clinical evidence of an acetabular labrum tear, confirmed with MRI. All patients responded well to a nonsurgical program that emphasized hip and lumbopelvic stabilization, correction of muscular imbalance, and sportspecific functional progression. 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J Orthop Sports Phys Ther. 2010;40:95-102. http://dx.doi.org/10.2519/jospt.2010.3302 @ MORE INFORMATION WWW.JOSPT.ORG journal of orthopaedic & sports physical therapy | volume 41 | number 5 | may 2011 | 353 41-05 Yazbek.indd 353 4/20/2011 2:30:21 PM
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