Rotator cuff tears in overhead athletes

Management of Shoulder Instability in the Overhead Athletes

Overhead athletes with anterior, posterior, and multidirectional shoulder instability present with a wide range of symptoms, especially considering the injury mechanism and affected supportive structures. As such, the management of shoulder instability is widely variable and relies on rehabilitation, operative management, and sport-specific considerations, such as positional and seasonal demands on the athlete. Biomechanical analysis may further aid in the recovery process or serve as a predictive tool to identify an increased risk for injury.

Evolution of the throwing shoulder: why apes don't throw well and how that applies to throwing athletes

BACKGROUND

Humans have unique characteristics making us the only primate that can throw well while most other primates throw predominately underhand with poor speed and accuracy. The purpose of this study is to illuminate the uniquely human characteristics that allow us to throw so well. When treating an injury such as a labral tear or capsule tear, this study hopes the reader can gain a better understanding of the issues that lead to the tear and those that may determine the success of treatment besides the actual repair.

METHODS

In addition to a review of scientific and medical literature, information was obtained from interviews and experience with primate veterinarians, anthropologists, archeologists, and professional baseball players. These sources were used to study the connection between evolutionary throwing activities and current sports medicine issues.

RESULTS

Arm acceleration requires a functional kinetic chain, rapid motor sequences, and the ability to absorb elastic energy in the shoulder. Successful treatment of the throwing shoulder requires awareness of the shoulder's position in the kinetic chain and correction of defects in the ability to execute the kinetic chain. Some problems in the shoulder could reflect regression to a more primitive anatomy or dyskinesis. Return of performance requires regaining the elasticity in the tissues of the shoulder to temporarily store kinetic energy. For example, tissue remodeling after rotator cuff repair continues for months to years; however, the newly formed tissue lacks the same elasticity of the native tendon. This suggests why throwing performance typically does not return for 7 or more months after repair even though there may be structural integrity at 3-4 months.

CONCLUSION

The shoulder has developed uniquely in modern man for the act of throwing. The anatomic deficiencies in primates for throwing provide an illustration of the more subtle changes that a throwing athlete might have that are detrimental to throwing. Nonhuman primates have been unable to demonstrate the kinetic chain sequence for throwing secondary to the lack of neurologic pathways required. Humans are more sophisticated and precise in their movements but lack robusticity in their bone and muscle architecture, seen especially in the human rotator cuff. Successful treatment of a throwing injury requires familiarity with the conditions that cause the injury or affect the rehabilitation process. The return of performance following injury or surgery requires regaining the elasticity in the tissues of the shoulder to temporarily store kinetic energy from the kinetic chain.

Single-Plane 3-Dimensional Isotropic Spin-Echo Magnetic Resonance Imaging Reconstructions of Shoulder Exhibit Superior Correlation to Surgical Findings Than 2-Dimensional Dixon Multiplanar Magnetic Resonance Imaging

OBJECTIVE

The aim of the study is to evaluate concordance of multiplanar 2-dimensional magnetic resonance imaging (2D-MRI) versus 3D isotropic MRI for rotator cuff and labral tears with the reference standard of arthroscopic surgical findings.

METHODS

It was an institutional review board-approved retrospective single-center study of consecutive preoperative patients with isotropic 3D-MRI on 3-Tesla scanners, multiplanar 2D-MRI, and shoulder arthroscopy. Scapular plane-oriented contiguous multiplanar reconstructions of 3D-images were evaluated by 2 experienced fellowship-trained musculoskeletal radiologists. Variables included the following: labral tear presence and rotator-cuff tear Ellman grade, thickness, and width. Sensitivities (Sen) and specificities (Spe) were calculated for binary variables. Mean squared errors (MSE) were calculated for ordinal variables. Lower MSE indicated higher concordance.

RESULTS

Seventy-two patients (43 female) with a mean age of 50.75 ± 9.76 years were evaluated. For infraspinatus-tear presence, 3D-MRI showed higher sensitivity (0.96) and specificity (0.68) than 2D-MRI (Sen = 0.85, Spe = 0.32) ( Psen = 0.005, Pspe = 0.002). For subscapularis-tear presence, 3D-MRI showed higher sensitivity (0.94) and specificity (0.73) compared with 2D-MRI (Sen = 0.83, Spe = 0.56) ( Psen = 0.02, Pspe = 0.04). For supraspinatus-tear presence, there was no significant difference between 3D-MRI (Sen =0.96, Spe = 0.67) compared with 2D-MRI (Sen = 0.98, Spe = 0.83) ( Psen = 0.43, Pspe = 0.63). For infraspinatus-tear thickness, 3D-MRI showed lower MSE (0.35) compared with 2D-MRI MSE (0.82) ( P = 0.01). For subscapularis-tear thickness, 3D-MRI had lower MSE (0.31) compared with 2D-MRI MSE (0.51) ( P = 0.007). However, no difference noted for supraspinatus-tear thickness when comparing 3D-MRI MSE (0.39) and 2D-MRI MSE (0.51) ( P = 0.49). For labral-tear presence, 3D-MRI had a lower MSE (0.20) compared with 2D-MRI MSE (0.57) ( P < 0.001).

CONCLUSIONS

Three-dimensional MRI of the shoulder is time efficient with a shorter acquisition time and exhibits comparable with superior correlation to surgical findings than 2D-MRI for detection of labral tears and some rotator cuff tears. Three-dimensional MRI may be used in place of traditional 2D-MRI in detection of soft-tissue shoulder injury in centers equipped to do so.

Prevalence, diagnosis and management of musculoskeletal disorders in elite athletes: A mini-review

Musculoskeletal injuries in elite sports are ones of the most impact issue because their remarkable impact on performance caused by drastic absence of training and competition and a progressive deterioration in physical health, emotional and social athletes' dimensions. Also, the prevalence of epidemiologic research found an incidence of musculoskeletal disorders vary within sports and in elite athletes which is even higher as a consequence of higher demand physical performance. This way, the loss of physical performance due to an sport injury impacts not only the individual economic sphere of the professional but also that ofsports entities, reaching, according to some studies, a loss estimated in the range of 74.7 million pounds. Thus, the purpose of this article is to review and to provide an overview of the most common musculoskeletal injuries in elite sports precipitating factors, clinical presentation, evidence-based diagnostic evaluation, and treatment recommendations with a view to preventing medical conditions or musculoskeletal injuries that may alter performance and general health in the elite athletes.

Performance Evaluation of an Immersive Virtual Reality Application for Rehabilitation after Arthroscopic Rotator Cuff Repair

Few studies have evaluated the effectiveness of shoulder rehabilitation in virtual environments. The objective of this study was to investigate the performance of a custom virtual reality application (VR app) with a stereophotogrammetric system considered the gold standard. A custom VR app was designed considering the recommended rehabilitation exercises following arthroscopic rotator cuff repair. Following the setting of the play space, the user's arm length, and height, five healthy volunteers performed four levels of rehabilitative exercises. Results for the first and second rounds of flexion and abduction displayed low total mean absolute error values and low numbers of unmet conditions. In internal and external rotation, the number of times conditions were not met was slightly higher; this was attributed to a lack of isolated shoulder movement. Data is promising, and volunteers were able to reach goal conditions more often than not. Despite positive results, more literature comparing VR applications with gold-standard clinical parameters is necessary. Nevertheless, results contribute to a body of literature that continues to encourage the application of VR to shoulder rehabilitation programs.

Midterm Clinical Outcomes After Arthroscopic Rotator Cuff Repair in Olympic Volleyball Players: Return to Sports and Return to Performance

Background

The decision-making process and predicting the time to return to sport (RTS) and return to performance (RTP) after arthroscopic rotator cuff repair (ARCR) in elite volleyball players are difficult issues to address, even among experienced shoulder surgeons.

Purpose/Hypothesis

The purpose of the study was to evaluate the results in Olympic-level volleyball players treated with arthroscopic supraspinatus repair and to report the RTS and the RTP. It was hypothesized that these athletes had higher RTS and faster RTP.

Study Design

Case series; Level of evidence, 4.

Methods

This study included 17 elite volleyball athletes (11 male, 6 female; mean age, 26.2 years) who underwent ARCR for partial- and full-thickness supraspinatus tears that did not improve despite nonoperative treatment. The clinical results were evaluated at 12 months postoperatively. The authors compared the athletes' preoperative, 6-month, and 12-month Kerlan-Jobe Orthopaedic Clinic (KJOC) scores and the visual analog scale (VAS) for pain after competition and conducted 6- and 12-month isometric strength analyses. The athletes' RTS and RTP times were recorded.

Results

All tears were on the dominant side (15 right, 2 left), and 82% were partial tears (14 partial thickness, 3 full thickness). The mean time from the onset of symptoms to surgery was 11.3 ± 6.7 months. While the mean Kerlan-Jobe Orthopaedic Clinic score was 31 preoperatively, it was 89 after 6 months (P < .001 vs preoperative) and 96 after 12 months (P = .003 vs 6 months). The mean VAS for pain was 7.9 preoperatively, 0.4 at 6 months (P < .001 vs preoperative), and 0.1 at 12 months (P = .02 vs 6 months). All athletes were able to reach their preinjury level, with RTS at a mean of 6.9 months and RTP at a mean of 12.4 months.

Conclusion

ARCR appears to be an effective option for Olympic-level volleyball players who do not benefit from nonoperative treatment. All athletes returned to their preinjury level of sports. The surgeon and athlete can plan surgical decision-making and timing based on the mean RTS time of 6.9 months and mean RTP time of 12.4 months.

Advances in the Treatment of Rotator Cuff Tears: Management of Rotator Cuff Tears in the Athlete

Unique biomechanical factors in the overhead and throwing athlete lead to a spectrum of rotator cuff pathology, usually with progressive lateralization of the supraspinatus footprint. Initial comprehensive nonoperative management is indicated for all athletes. Progression to arthroscopic debridement, repair of concomitant injuries, and possible rotator cuff repair with a transosseous equivalent technique are the current management strategies for athletes when nonoperative management fails.

The Applicability of Provocative Functional Tests in the Diagnosis of Rotator Cuff Muscle Injuries of the Best University Athletes

Rotator cuff disease, external and internal impingement syndromes, low shoulder stability, various types of trauma, and overuse injuries are all related to sports activities. In order to check symptoms in patients with disability and shoulder pain, clinicians use different methods and diagnostic imaging assessment. The research is aimed at evaluating whether there is a difference between provocation function tests (PFT) and ultrasonographic (US) testing of muscles within the rotator cuff in elite collegiate athletes. Patients ( $n=184$ ) were recruited from university team sports selections and tested with a standardized US examination of the shoulder and five PFTs (Speed’s test, Neer’s test, Hawkins test, lift-off test, Yergason’s test). Based on the VAS pain assessment scale, 60 subjects had some pain, which was taken for further processing in the work (124 subjects did not have the presence of pain and were excluded from further processing). The US examination was conducted using Voluson 730 apparatus, by a linear probe, with the frequency in the range of 6-12 MHz. The chi-square test showed significant differences between PFT and the occurrence of shoulder muscle tendinitis for the following variables: Speed’s test and subscapularis tendinitis ( $p=0.02$ ) and Speed’s test and infraspinatus tendinitis ( $p=0.01$ ); Neer test and biceps brachii caput longum tendinitis ( $p=0.01$ ), Neer test and supraspinatus tendinitis ( $p=0.02$ ) and Neer test and infraspinatus tendinitis ( $p=0.01$ ); lift-off test and subscapularis tendinitis ( $p=0.05$ ); and Yergason’s test and biceps brachii caput longum tendinitis ( $p=0.03$ ) and Yergason’s test and subscapitis tendinitis ( $p=0.01$ ). The greatest effect of differences was observed in Neer’s test and biceps brachii caput longum tendinitis ( $\phi =0.60$ ), while the other effects can be described as medium and small in most cases. It can be concluded that functional tests are good predictors of soft tissue changes in the muscles of the rotator cuff of the shoulder. Further monitoring and analysis are needed on a larger number of athletes.

International physical therapists consensus on clinical descriptors for diagnosing rotator cuff related shoulder pain: A Delphi study

BACKGROUND

There is a lack of standardized criteria for diagnosing rotator cuff related shoulder pain (RCRSP).

OBJECTIVE

To identify the most relevant clinical descriptors for diagnosing RCRSP.

METHODS

A Delphi study was conducted through use of an international physical therapists expert panel. A 3-round Delphi survey involving an international panel of physical therapists experts with extensive clinical, teaching, and research experience was conducted. A search query was performed in Web of Science, along with a manual search, to find the experts. The first round was composed of items obtained from a previous pilot Delphi study along with new items proposed by the experts. Participants were asked to rate items across six clinical domains using a five-point Likert scale. An Aiken's Validity Index ≥ 0.7 was considered indicative of group consensus.

RESULTS

Fifteen experts participated in the Delphi survey. After the three rounds, consensus was reached on 18 clinical descriptors: 10 items were included in the "subjective examination" domain, 1 item was included in the "patient-reported outcome measures" domain, 3 items in the "diagnostic examination" domain, 2 items in the "physical examination" domain", and 2 items in the "functional tests" domain. No items reached consensus within the "special tests" domain. The reproduction of symptoms in relation to the application of load, the performance of overhead activities, and the need of active and resisted movement assessment were some of the results with greatest consensus.

CONCLUSION

In this Delphi study, a total of 18 clinical descriptors across six clinical domains were agreed upon for diagnosing RCRSP.

Cell lineage tracing and functional assessment of supraspinatus tendon healing in an acute repair murine model

Rotator cuff supraspinatus tendon injuries are common with high rates of anatomic failure after surgical repair. The purpose of the study was to define clinically relevant features of a mouse model of supraspinatus tendon injury to determine painful, functional, and structural outcomes; we further investigated two cell populations mediating healing using genetic lineage tracing after full detachment and repair of the supraspinatus tendon in mice. The pain was assessed using the mouse grimace scale and function by gait analysis and tensile testing. Histological and microCT analyses were used to determine enthesis/tendon and bone structure, respectively. Lineage tracing was carried out using inducible Cre lines for ScxCreERT2 (tendon cells) and αSMACreERT2 (myofibroblasts and mesenchymal progenitors). Mice only expressed pain transiently after surgery despite long-term impairment of functional and structural properties. Gait, tensile mechanical properties, and bone properties were significantly reduced after injury and repair. Lineage tracing showed relatively few Scx ^lin tendon cells while αSMA ^lin cells contributed strongly to scar formation. Despite surgical reattachment of healthy tendon, lineage tracing revealed poor preservation of supraspinatus tendon after acute injury and loss of tendon structure, suggesting that tendon degeneration is also a key impediment of successful rotator cuff repair. Scar formation after surgery is mediated largely by αSMA ^lin cells and results in permanently reduced functional and structural properties.

Rotator Cuff Injuries in Tennis Players

PURPOSE OF REVIEW

This review presents epidemiology, etiology, management, and surgical outcomes of rotator cuff injuries in tennis players.

RECENT FINDINGS

Rotator cuff injuries in tennis players are usually progressive overuse injuries ranging from partial-thickness articular- or bursal-sided tears to full-thickness tears. Most injuries are partial-thickness articular-sided tears, while full-thickness tears tend to occur in older-aged players. The serve is the most energy-demanding motion in the sport, and it accounts for 45 to 60% of all strokes performed in a tennis match, putting the shoulder at increased risk of overuse injury and rotator cuff tears. Studies have shown deficits in shoulder range of motion and scapular dyskinesia to occur even acutely after a tennis match. First-line treatment for rotator cuff injuries in any overhead athlete consists of conservative non-operative management with appropriate rest, anti-inflammatory drugs, followed by a specific rehabilitation program. Operative treatment is usually reserved for older-aged players and to those who fail to return to play after conservative measures. Surgical options include rotator cuff debridement with or without tendon repair, biceps tenodesis, and labral procedures. Unlike rotator cuff repairs in the general population, repairs in the elite tennis athlete have less than ideal rates of return to sport to the same level of performance. Rotator cuff injuries are a common cause of pain and dysfunction in tennis players and other overhead athletes. The etiology of rotator cuff tears in tennis players is multifactorial and usually results from microtrauma and internal impingement in the younger athlete leading to partial tearing and degenerative full-thickness tears in older players. Surgical treatment is pursued in athletes who are still symptomatic despite an extensive course of non-operative treatment as outcomes with regard to returning to sport to the same pre-injury level are modest at best. Debridement alone is usually preferred over rotator cuff repairs for partial tears in younger players due to potential over-constraining of the shoulder joint and decreased rates of return to sport after rotator cuff repairs.

Genetic lineage tracing of targeted cell populations during enthesis healing

Rotator cuff supraspinatus tendon injuries are clinically challenging due to the high rates of failure after surgical repair. One key limitation to functional healing is the failure to regenerate the enthesis transition between tendon and bone, which heals by disorganized scar formation. Using two models of supraspinatus tendon injury in mouse (partial tear and full detachment/repair), the purpose of the study was to determine functional gait outcomes and identify the origin of the cells that mediate healing. Consistent with previous reports, enthesis injuries did not regenerate; partial tear resulted in a localized scar defect adjacent to intact enthesis, while full detachment with repair resulted in full disruption of enthesis alignment and massive scar formation between tendon and enthesis fibrocartilage. Although gait after partial tear injury was largely normal, gait was permanently impaired after full detachment/repair. Genetic lineage tracing of intrinsic tendon and cartilage/fibrocartilage cells (Scx^CreERT2 and Sox9^CreERT2 , respectively), myofibroblasts (αSMA^CreERT2 ), and Wnt-responsive stem cells (Axin2^CreERT2 ) failed to identify scar-forming cells in partial tear injury. Unmineralized enthesis fibrocartilage was strongly labeled by Sox9^CreERT2 while Axin2^CrERT2 labeled a subset of tendon cells away from the skeletal insertion site. In contrast to the partial tear model, Axin2^CreERT2 labeling showed considerable contribution of Axin2^lin cells to the scar after full detachment/repair. Clinical Significance: Clinically relevant models of rotator cuff tendon injuries in mouse enable the use of genetic tools; lineage tracing suggests that distinct mechanisms of healing are activated with full detachment/repair injuries versus partial tear. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:3275-3284, 2018.

Arthroscopic single-row repair of massive potentially irreparable postero-superior cuff tear

PURPOSE

We retrospectively evaluated the results of complete repair of massive potentially irreparable postero-superior tears in a consecutive cohort of patients. With the increasing and widespread use of superior capsular reconstruction, a complete repair of the superior cuff, also if not functional, may be a valuable option for irreparable cuff lesions.

METHODS

A consecutive case series of massive potentially irreparable postero-superior cuff tears that underwent complete repair was included in the study. Irreparability of cuff tear was defined when on preoperative MRI images, a positive tangent sign, a Goutallier 3-4 stage of fatty infiltration, and an absent acromion-humeral distance were present. A single-row complete repair was performed using triple-loaded titanium suture anchors. Operative time was recorded, as well as intra- and postoperative complications. Patients were followed for 12 months post-op; they were clinically evaluated with the use of constant score (CS) and subjective shoulder value (SSV) at 3, 6, and 12 months; a 12-month postoperative ultrasound evaluation was obtained.

RESULTS

Thirty-two patients satisfying the inclusion criteria were enrolled. The mean age was 52 years (range 41-58). The repair was completed with a mean use of 2.4 triple-loaded suture anchors (range 2-4); the mean operative time was 70 min (range 45-90). The mean preoperative CS was 55 (range 45-75, SD 17), while the SSV was 40 (range 30-70, SD 22). At the final follow-up, the mean CS and SSV were 72 (range 62-85, SD 8) and 80 (range 60-90, SD 10) (p < 0.001 with respect to the preoperative scores), respectively. At the final follow-up, sonography showed a complete healing of the cuff in 20 cases (62.5%). No intra-operative complications occurred; at the final follow-up, five patients (15, 6%) were not satisfied of the results and asked for revision surgery.

CONCLUSIONS

The complete repair of massive potentially irreparable rotator cuff tear in patients younger than 60 years old yielded good results at a short-term follow-up, with a sonographic re-tear rate of about 20%. Even if it is logical to consider a tendon with severe fatty degeneration as non-functional, the superior soft tissue reconstruction we achieved may have at least the same results of a superior capsular reconstruction, with obvious lower costs.

LEVEL OF EVIDENCE

Level 4, case series with no comparison group.

Assessment of return to play in professional overhead athletes subjected to arthroscopic repair of rotator cuff tears and associated labral injuries using the Italian version of the Kerlan-Jobe Orthopedic Clinic Shoulder and Elbow score

BACKGROUND

The self-administered Kerlan-Jobe Orthopedic Clinic (KJOC) Shoulder and Elbow questionnaire is a reliable and sensitive outcome tool to assess upper extremity athletic performance and functional changes affecting return to play in overhead athletes. We report the results of a study of return to sport in professional overhead athletes at a mean follow-up of 2 years after arthroscopic repair of rotator cuff tears and associated labral injuries using the Italian version of the score.

MATERIALS AND METHODS

A total number of 38 patients completed the 10-item questionnaire before and after surgery. They were also asked (1) whether they had returned to play; (2) how many months after the operation they had done so; (3) the level of postoperative performance (preinjury or less); and (4) whether they had had to change sport due to their shoulder problems.

RESULTS

Significant differences were found (1) between preoperative and postoperative scores; (2) between the scores of patients who returned to play at preinjury level and those who merely returned to competition; and (3) between the postoperative subscores of 8/10 items, which were higher in the patients who returned to preinjury performance than in those who merely returned to play; the two items that were not significantly different between these subgroups concerned pain and joint stability. Even though item analysis highlighted a major role for athletic performance in recovery of preinjury performance, it also stressed that the athlete's relationship with coach, agent, and staff and his/her feeling of the extent to which the arm affects current performance significantly contribute to the final score.

CONCLUSIONS

The KJOC Shoulder and Elbow score provides an accurate and exhaustive assessment of the recovery of the athlete's shoulder in relation to preinjury performance and provides the surgeon with key information on the pros and cons of surgical management.

Genome-wide association study identifies a locus associated with rotator cuff injury

Rotator cuff tears are common, especially in the fifth and sixth decades of life, but can also occur in the competitive athlete. Genetic differences may contribute to overall injury risk. Identifying genetic loci associated with rotator cuff injury could shed light on the etiology of this injury. We performed a genome-wide association screen using publically available data from the Research Program in Genes, Environment and Health including 8,357 cases of rotator cuff injury and 94,622 controls. We found rs71404070 to show a genome-wide significant association with rotator cuff injury with p = 2.31x10-8 and an odds ratio of 1.25 per allele. This SNP is located next to cadherin8, which encodes a protein involved in cell adhesion. We also attempted to validate previous gene association studies that had reported a total of 18 SNPs showing a significant association with rotator cuff injury. However, none of the 18 SNPs were validated in our dataset. rs71404070 may be informative in explaining why some individuals are more susceptible to rotator cuff injury than others.

Arthroscopic Rotator Cuff Repair With Mini-open Subpectoral Biceps Tenodesis

With a range of tear characteristics such as chronicity, degree of fatty atrophy, and number of tendons involved as well as varying patient-specific characteristics including age, injury mechanism, and expectations after treatment to consider, proper and successful treatment of a rotator cuff tear is multifactorial and, consequently, challenging. Although conservative management of a rotator cuff tear may be successful, a more severe tear with involvement of more tendons may warrant surgical intervention. Furthermore, additional pathology including biceps tendinopathy may result in greater patient morbidity and an even more complex treatment decision-making process and surgical technique. The purpose of this Technical Note is to describe our preferred surgical technique for the treatment of a rotator cuff tear involving 2 rotator cuff tendons in conjunction with a lesion of the long head of the biceps tendon.

Shoulder Injuries in the Overhead Throwing Athlete

The overhead pitching motion is a coordinated sequence of movements that subjects the shoulder to extreme forces. The ultimate goal of this complex, dynamic activity is to generate high ball velocity and accuracy. In doing so, repetitive throwing can cause adaptive and pathologic changes in the thrower's shoulder. This article reviews the relevant shoulder anatomy, the kinetic chain, and throwing mechanics, as well as common shoulder injuries and surgical options for the treating orthopedic surgeon.

Clinical and Ultrasonographic Evaluations of the Shoulders of Elite Swimmers

BACKGROUND

Shoulder pain is a common problem in competitive swimmers, but the structural alterations in elite-level competitive swimmers are not well known.

HYPOTHESIS

Adaptive changes are common in the rotator cuff, bursa, labrum, and capsule in elite swimmers, and such abnormalities are related to factors concerning training and correlate with symptoms.

STUDY DESIGN

Cross-sectional study; Level of evidence, 3.

METHODS

The study population was the 2008 United States Olympic swimming team. All athletes completed standardized scales on shoulder pain and function and provided data on their training history and history of shoulder pain or injuries. Each athlete also underwent a comprehensive physical examination of both shoulders, followed by an evaluation of the rotator cuff, biceps, and bursa using ultrasound with dynamic images to assess for subcoracoid impingement and subacromial impingement.

RESULTS

A history of shoulder pain was reported by 29 of 42 (66%) athletes. Morphological changes consistent with tendinosis were common in the biceps (33/46 shoulders; 72%) and supraspinatus/infraspinatus (44/46 shoulders; 96%). Subcoracoid impingement was seen in 17 of 46 shoulders (37%), with subacromial impingement seen in 34 of 41 shoulders (83%). There was an increased odds ratio (OR) for biceps tendinosis in older swimmers (OR, 1.92; 95% CI, 1.23-3.00; P = .004) and in swimmers who had missed a competition because of shoulder pain (OR, 9.76; 95% CI, 1.13-84.3; P = .038). There was an increased OR for rotator cuff tendinosis in swimmers who reported worse scores for pain with activities (OR, 0.10; 95% CI, 0.01-0.78; P = .028) and in those with a positive sulcus sign (OR, 33.2; 95% CI, 3.09-355; P = .004). There was an increased OR for impingement in swimmers with a positive sulcus sign (OR, 5.40; 95% CI, 0.80-36.3; P = .083), worse pain scores (OR, 0.44; 95% CI, 0.22-0.87; P = .019), and a partial rotator cuff tear (OR, 31.2; 95% CI, 3.58-272; P = .002).

CONCLUSION

We found a high prevalence of rotator cuff and biceps tendinopathy, which was associated with increased symptoms. Tendinosis was also more common in swimmers with a positive sulcus sign, suggesting a role for shoulder laxity.

Labrum and rotator cuff injuries in the throwing athlete

The large amount of force imparted across the shoulder during the act of throwing makes the glenohumeral joint highly susceptible to injury in the athlete performing overhead throwing motions. The bony incongruity of the shoulder enables greater range of motion than any other joint in the body, but it also results in significant strain on the surrounding soft tissues during the throwing motion. Throwers can present with acute injuries, but more commonly they suffer from chronic overuse conditions resulting from repetitive overload. Proper management requires early recognition with treatment directed toward the athlete's safe return to sports. Failure to institute an appropriate management strategy may result in significant complications, including prolonged disability, progression of symptoms, and further injury. We discuss the functional anatomy, pathophysiology, clinical presentation, evaluation, and treatment of common injuries of the glenoid labrum and rotator cuff in the overhead throwing athlete.

Humeral stress edema: an injury in overhead athletes quarterback with humeral "shin" splints-a case report

Stress injury to the distal humerus has been reported as a cause of chronic arm pain among competitive tennis players. As the serve is technically similar to an overhead throwing motion, it is conceivable that this injury could occur in other overhead athletes. Overuse injuries, including rotator cuff tears, ulnar collateral ligament injuries, and joint sprains have routinely been reported in quarterbacks, but there are few reported cases of upper extremity bony stress injuries in these athletes. Magnetic resonance imaging aids in the diagnostic evaluation of an upper extremity injury as it can identify numerous structural injuries and early stress changes within bone. Accurately diagnosing stress reactions helps prevent progression toward stress fracture, which is possible if conservative measures are initiated early in the rehabilitation period. In this article, we report the case of an elite college quarterback who presented with localized elbow pain while throwing.

Detailed shoulder MRI findings in manual wheelchair users with shoulder pain

Shoulder pain and pathology are common in manual wheelchair (MWC) users with paraplegia, and the biomechanical mechanism of injury is largely unknown. Establishing patterns of MRI characteristics in MWC users would help advance understanding of the mechanical etiology of rotator cuff disease, thus improving the logic for prescribed interventions. The purpose of this study was to report detailed shoulder MRI findings in a sample of 10 MWC users with anterolateral shoulder pain. The imaging assessments were performed using our standardized MRI Assessment of the Shoulder (MAS) guide. The tendon most commonly torn was the supraspinatus at the insertion site in the anterior portion in either the intrasubstance or articular region. Additionally, widespread tendinopathy, CA ligament thickening, subacromial bursitis, labral tears, and AC joint degenerative arthrosis and edema were common. Further reporting of detailed shoulder imaging findings is needed to confirm patterns of tears in MWC users regarding probable tendon tear zone, region, and portion. This investigation was a small sample observational study and did not yield data that can define patterns of pathology. However, synthesis of detailed findings from multiple studies could define patterns of pathological MRI findings allowing for associations of imaging findings to risk factors including specific activities.