Is workload associated with latissimus dorsi and teres major tears in professional baseball pitchers? An analysis of days of rest, innings pitched, and batters faced.

BACKGROUND: Latissimus dorsi (LD) and teres major (TM) tears have become increasingly recognized injuries in professional baseball pitchers. The purpose of this study was to determine whether workload, as measured by the number of days of rest between outings, number of innings pitched, number of batters faced, and being a starting pitcher, is associated with an increased risk of sustaining an LD-TM tear in professional baseball pitchers. METHODS: All professional baseball pitchers who sustained an LD-TM tear between 2011 and 2017 were identified using the Major League Baseball Health and Injury Tracking System. A separate player-usage data set was used to determine workload. We then compared workload variables between pitcher-games 2, 6, 12, and >12 weeks prior to a documented LD-TM tear and pitcher-games from a non-LD-TM tear control group. In a paired analysis, we compared the acute workload (2, 6, and 12 weeks) prior to injury and the injured pitchers' non-acute workload >12 weeks prior to injury. RESULTS: A total of 224 unique LD-TM tears were documented in the Major League Baseball Health and Injury Tracking System database. In most periods, player-games with more innings pitched and more batters faced were associated with a higher incidence of subsequent LD-TM tears. The number of days of rest was not a significant predictor of an LD-TM tear in the acute workload setting, but pitchers who sustained an LD-TM injury averaged fewer days of rest over the previous ≥12 weeks than controls (P < .001). Pitchers who faced >30 batters per game showed a 1.57-fold increase in the percentage of pitchers with a subsequent LD-TM tear as compared with pitchers who faced ≤5 batters per game. Significantly more starting pitchers were in the case group that sustained LD-TM tears over multiple time points than in the control group. CONCLUSION: Having a greater pitcher workload and being a starting pitcher were associated with an increased risk of sustaining LD-TM tears in professional baseball players. The average number of days of rest was only a risk factor for LD-TM tears over a 3-month or longer period.

Incorporation of the Kinetic Chain Into Shoulder-Elevation Exercises: Does It Affect Scapular Muscle Activity?

CONTEXT: Scapular rehabilitation exercises should focus on selective activation of weaker muscles and minimal activation of hyperactive muscles. For rehabilitation of overhead athletes, single-plane open chain exercises below 90° of shoulder elevation are often recommended. Moreover, incorporating the kinetic chain in shoulder rehabilitation exercises is advised and has been suggested to influence scapular muscle activity levels. OBJECTIVE: To study the influence of kinetic chain incorporation during 5 variations of a shoulder-elevation exercise on scapular muscle activity. DESIGN: Cross-sectional study. SETTING: University laboratory. PATIENTS OR OTHER PARTICIPANTS: Thirty-one asymptomatic participants (15 men, 16 women). MAIN OUTCOME MEASURE(S): The electromyographic activity of the upper (UT), middle (MT), and lower (LT) trapezius, and serratus anterior was determined during 5 variations of bilateral elevation with external rotation: (1) open-hand position (reference exercise), (2) closed-hand position, (3) dynamic bipedal squat, (4) static unipedal squat, and (5) dynamic unipedal squat on the contralateral leg. All data were normalized as a percentage of maximal voluntary isometric contraction (MVIC). RESULTS: A closed-hand position (exercise 2) instead of an open-hand position (exercise 1) resulted in lower MT (mean difference = 3.44% MVIC) and LT (mean difference = 7.76% MVIC) activity. Incorporating the lower limb (exercises 3-5) increased UT activity when compared with exercise 1 (mean differences = 3.67, 2.68, 5.02% MVIC, respectively), which in general resulted in increased UT : MT ratios. Additionally, LT activity decreased when a dynamic unipedal squat was added (mean difference: 4.90% MVIC). For the serratus anterior, the greatest activity occurred during elevation in a static unipedal squat position (exercise 4, 22.90% MVIC). CONCLUSIONS: Incorporating the kinetic chain during shoulder-elevation exercises influenced scapular muscle activity and ratios. In particular, incorporating the lower limb resulted in more UT activity, whereas the open-hand position increased MT and LT activity.

Latissimus Dorsi Myotendinous Repair with Allograft Hamstring Tendon Graft Augmentation: A Case Report.

CASE: A 30-year-old male weightlifter presented after suffering a myotendinous rupture of his latissimus dorsi from heavy weightlifting. Latissimus dorsi injuries are rare, with little to no documented technique in the literature on management, particularly of ruptures through the myotendinous junction of the anatomical muscle. This case report describes the surgical technique, approach, and postoperative management of an acutely avulsed latissimus dorsi using an allograft hamstring tendon to repair the myotendinous junction. CONCLUSION: Allograft hamstring tendon graft augmentation is a viable repair option for patients with latissimus dorsi myotendinous rupture.

Application of Lactobacillus gasseri 63 AM supernatant to Pseudomonas aeruginosa-infected wounds prevents sepsis in murine models of thermal injury and dorsal excision.

Introduction. Severely burned patients are susceptible to bacterial infection within their burn wounds, which frequently leads to sepsis, multiple organ failure and death. The opportunistic pathogen Pseudomonas aeruginosa, an organism inherently resistant to multiple antibiotics, is a common cause of sepsis in these patients.Aim. Development of a topical treatment unrelated to conventional antibiotics is essential for prevention of P. aeruginosa infection and sepsis, leading to a role for the direct application of probiotics or their by-products.Methodology. We examined the effectiveness of 20× concentrated supernatant from Lactobacillus gasseri strain 63 AM (LgCS) grown in de Man, Rogosa and Sharpe broth in inhibiting P. aeruginosa biofilms in vitro, as well as in reducing wound bioburden and P. aeruginosa sepsis in vivo.Results. LgCS inhibited the growth of P. aeruginosa strain PAO1, prevented its biofilm development and eliminated partially developed PAO1 biofilms. In the murine model of thermal injury, a single injection of LgCS following injury and PAO1 infection reduced mortality to 0 % and prevented systemic spread (sepsis). Furthermore, a second injection of LgCS 24 h after the first eliminated PAO1 from the wound. In the murine dorsal excision infection model, either LgCS or ceftazidime treatment of the PAO1-infected wound significantly reduced the mortality rate among infected mice, while combining LgCS with ceftazidime eliminated mortality.Conclusion. These results suggest the potential of LgCS in preventing sepsis from P. aeruginosa infection in severely burned and other immunocompromised patients.

Performance and Return to Sport After Latissimus Dorsi and Teres Major Tears Among Professional Baseball Pitchers.

BACKGROUND: Latissimus dorsi and teres major (LD/TM) tears are becoming an increasingly common cause of injury and disability among professional baseball pitchers. PURPOSE/HYPOTHESIS: To determine performance and return to sport (RTS) among professional baseball pitchers after LD/TM tears treated operatively and nonoperatively and to compare the RTS rate and performance between pitchers who sustained an LD/TM tear and matched controls. The authors hypothesized a high RTS rate among professional baseball pitchers after LD/TM tears, with no significant difference in RTS rate or performance between cases and controls for operative and nonoperative treatment-specifically, in the primary performance outcome variables of WHIP ([walks + hits] / innings pitched), fielding independent pitching, and wins above replacement. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: All professional baseball pitchers who sustained an LD/TM tear between 2011 and 2016 were identified with the Health and Injury Tracking System database of Major League Baseball. Demographic and performance data (before and after injury) were recorded for each player. Performance metrics were then compared between cases and matched controls by operative and nonoperative treatment. RESULTS: Overall, 120 pitchers had a documented LD/TM tear; 42 (35%) were major league players. Most players (n = 107, 89.2%) were treated nonoperatively. Time to return to the same level of competition was 170 ± 169 days (mean ± SD) for pitchers treated nonoperatively and 406 ± 146 days for those treated operatively. The RTS rate among players treated nonoperatively and operatively was identical at 75%. Players treated nonoperatively had no change in fielding independent pitching or wins above replacement after injury but had a higher (ie, worse) WHIP after injury ( P = .039); they also performed significantly worse in several secondary performance metrics, including number of games played per year ( P < .001). Players treated operatively had no change in any measured performance metrics after surgery. No difference existed between cases and controls in the primary performance variables. CONCLUSION: The majority of LD/TM tears are treated nonoperatively. The RTS rate is 75% for professional baseball pitchers after LD/TM tears treated operatively or nonoperatively. Players treated nonoperatively saw a decline in several performance metrics, while players treated operatively had no significant difference in performance after surgery.

Latissimus Dorsi Tendon Rupture.

Isolated injury to the latissimus dorsi is rare. Partial tendon tears may be successfully treated nonsurgically. Complete tendon ruptures require surgical repair. Tendon repair can be approached either through an anterior deltopectoral incision with a secondary small posterior axillary incision or through a long posterior axillary incision. Suture anchors can be used to repair the latissimus dorsi to the humeral attachment. Although the literature is limited to single-patient case series, most patients have returned to full athletic activity after surgical repair.

Effects of selected rehabilitative exercises on external rotator muscles and trapezius muscles of masonry workers.

BACKGROUND: Masonry workers engaged in occupational work-activities have high risk of shoulder injury that often develops to functional loss and disability. Rehabilitative exercises (REs) have potential for slowing this development. OBJECTIVE: The objective is to study the effects of three selected REs on integrated electromyography activations of the external rotator muscles and trapezius muscles of masonry workers. METHODS: Ten subjects, masonry workers having shoulder pain, have volunteered for this study. Each subject performs three selected REs: (1) Prone horizontal abduction at 90° with full external rotation with thumb right up. (2) Side lying external rotation (ER) with elbow on the trunk. (3) ER at 90° abduction and elbow flexion at 90° in standing position. Selection of REs is based on their superior performance in earlier studies. Electromyography (EMG) differences among the exercises are tested for statistical significance. RESULTS: A cross comparison of REs shows that exercises (1) and (3) produce high rotator cuff synergy, an average of infraspinatus and teres-minor activities. Exercise (3) minimizes the risk of subacromial impingement by presenting the least posterior deltoid activity. However, exercise (1) reduces the risk of abnormal scapular movement by producing higher middle trapezius and lower trapezius activities than upper trapezius activity. CONCLUSION: The results provide basic information to design appropriate rehabilitation programs for masonry workers having shoulder pain.

Decreased Hip Internal Rotation Increases the Risk of Back and Abdominal Muscle Injuries in Professional Baseball Players: Analysis of 258 Player-seasons.

INTRODUCTION: The relationship of hip range of motion (ROM) to shoulder, elbow, abdominal, and back injuries remains undefined. METHODS: We assessed hip ROM on players reporting to Major League Spring Training for an organization over six seasons (2010 to 2015). Hip ROM was correlated with player abdominal, back, shoulder, and elbow injury status for those seasons using multivariate binomial logistic regression analysis. RESULTS: A total of 258 player-seasons (129 pitchers and 129 position players) resulted in 20 back and 35 abdominal injuries across all players and 28 elbow and 25 shoulder injuries in pitchers. Hip ROM did not correlate with shoulder or elbow injuries. Hip internal rotation deficit of 5° correlated with core injury (odds ratio [OR], 1.40; P = 0.024 for pitchers; OR, 1.35; P = 0.026 for position players) and back injury (OR, 1.160; P = 0.022 for pitchers). DISCUSSION: Hip internal rotation deficits were predictive of back and abdominal injuries but not shoulder or elbow injury.

Reconstrução de úmero e reanimação do cotovelo com retalho osteomiocutâneo da escápula: relato de caso / Reconstruction of the humerus and rehabilitation of the elbow using an osteomyocutaneous scapular flap: a case report

Introdução: No presente trabalho, relatamos um caso de reconstrução do terço proximal do úmero direito e reanimação do cotovelo de um paciente masculino, de 20 anos, vítima de acidente automobilístico, com necrose óssea de 5 cm no terço proximal do úmero e avulsão do bíceps braquial. Métodos: Utilizamos o retalho ósseo da escápula, associado ao retalho miocutâneo do grande dorsal, tendo como pedículo os vasos subescapulares. Resultados: O paciente teve excelente evolução no pós-operatório, apresentando-se, no pós-operatório de 2 meses, com consolidação óssea e iniciando a flexão do cotovelo. Conclusões: Perante a utilização do retalho descrito, concluímos que esta modalidade de retalho se insere no arsenal dos retalhos ósseos de maior segurança nas reconstruções ósseas em geral.

Introduction: We report a case of reconstruction of the proximal third of the right humerus and rehabilitation of the elbow in a 20-year-old male patient who was injured in an automobile accident and developed bone necrosis of 5 cm at the proximal third of the humerus and avulsion of the brachial biceps. Methods: A scapular bone flap was used, together with a latissimus dorsi myocutaneous flap, using subscapular vessels for the pedicle. Results: The patient had excellent postoperative course, presenting in the 2-month postoperative period with bone consolidation and initiation of elbow flexion. Conclusions: This flap modality is a safe and useful option for bone reconstruction.

The use of Achilles tendon allograft for latissimus dorsi tendon reconstruction: a minimally invasive technique.

Treatment of subacute, retracted latissimus dorsi and teres major tendon ruptures in young overhead athletes is challenging. This case report describes management of a subacute retracted latissimus dorsi and teres major rupture with Achilles tendon allograft reconstruction using a two-incision minimally invasive technique. Level of evidence V.

Performance and return to sport in elite baseball players and recreational athletes following repair of the latissimus dorsi and teres major.

BACKGROUND: Tears of the latissimus dorsi (LD) and teres major (TM) are rare but disabling injuries in the overhead athlete. METHODS: All patients who underwent an LD and/or TM repair between January 1, 2010, and June 6, 2016, with more than 12 months' follow-up were included. Demographic information and postoperative range of motion were recorded. Patients were contacted via phone and answered questions to provide the following: Kerlan-Jobe Orthopaedic Clinic (KJOC) shoulder and elbow outcome score, American Shoulder and Elbow Surgeons (ASES) shoulder score, and visual analog scale (VAS) score. Performance data for professional athletes were recorded preoperatively and postoperatively and compared by paired t tests. RESULTS: Eleven male patients aged 29.9 ± 12.4 years were included; 86% were right hand dominant, 86% underwent surgery on the dominant side, and 73% were pitchers (7 professional and 1 collegiate). The mean time from injury to repair was 389 ± 789 days; 36% of repairs were performed within 6 weeks of injury. At final follow-up, the VAS score was 0.7 ± 1.9, the ASES score was 100 ± 0, and the KJOC score was 93 ± 5. Professional (major and minor league) pitchers had a mean total time participating in professional baseball of 6.6 ± 3.9 years, with 3.9 ± 2.3 years before surgery and 2.7 ± 1.8 years after surgery. Among professional pitchers, the VAS pain score was 0.0 ± 0.0, the ASES score was 100 ± 0, and the KJOC score was 89 ± 2. All professional pitchers returned to the same level of play. No significant differences existed between any preoperative and postoperative performance metrics for pitchers (P > .05). CONCLUSION: Repair of LD and TM tears in both professional and recreational athletes produces reliable functional recovery with minimal pain and the ability to return to preoperative athletic activity, even among elite throwing athletes.

Evaluation of dynamic changes in interstitial fluid proteome following microdialysis probe insertion trauma in trapezius muscle of healthy women.

Microdialysis (MD) has been shown to be a promising technique for sampling of biomarkers. Implantation of MD probe causes an acute tissue trauma and provokes innate response cascades. In order to normalize tissue a two hours equilibration period for analysis of small molecules has been reported previously. However, how the proteome profile changes due to this acute trauma has yet to be fully understood. To characterize the early proteome events induced by this trauma we compared proteome in muscle dialysate collected during the equilibration period with two hours later in "post-trauma". Samples were collected from healthy females using a 100 kDa MW cut off membrane and analyzed by high sensitive liquid chromatography tandem mass spectrometry. Proteins involved in stress response, immune system processes, inflammatory responses and nociception from extracellular and intracellular fluid spaces were identified. Sixteen proteins were found to be differentially abundant in samples collected during first two hours in comparison to "post-trauma". Our data suggests that microdialysis in combination with mass spectrometry may provide potentially new insights into the interstitial proteome of trapezius muscle, yet should be further adjusted for biomarker discovery and diagnostics. Moreover, MD proteome alterations in response to catheter injury may reflect individual innate reactivity.

Sports Injuries to the Latissimus Dorsi and Teres Major.

Injuries to the latissimus dorsi and teres major muscles, while rare, are debilitating. They are seen in a variety of sports, although disproportionately in the throwing shoulder of baseball pitchers. There have been 25 case reports and 2 case series published on the nonoperative and operative management of these injuries. Latissimus dorsi and teres major muscle anatomy, function, and common injury patterns are well described in these case reports. Also well detailed are the typical patient presentation, physical examination, and imaging findings. Latissimus dorsi tendon injuries are sometimes treated operatively, whereas latissimus dorsi muscle belly or isolated teres major injuries are treated nonoperatively. Nonoperative treatment includes oral anti-inflammatories and shoulder physical therapy. A number of surgical patient positions, approaches, and fixation constructs have been described, although 2 techniques of positioning and surgical approach are used most commonly. Fixation is most often performed with suture anchors. Return-to-play timing, shoulder strength, and healing on magnetic resonance imaging are variable. No standard of care currently exists for the treatment of latissimus dorsi or teres major injuries. If treating a patient with an injury to either muscle, the clinician should be familiar with accumulated experience as reported in the published literature.

Proliferative myositis of the latissimus dorsi presenting in a 20-year-old male athlete.

We describe the case of a 20-year-old rower presenting with an uncommon condition of Proliferative Myositis (PM) affecting the Latissimus Dorsi (LD). PM is a rare, benign tumour infrequently developing in the upper back. Its rapid growth and firm consistency may mistake it for sarcoma at presentation. Therefore, careful multidisciplinary work-up is crucial, and should involve appropriate radiological and histopathological investigations. Here, we propose the aetiology of LD PM to be persistent myotrauma induced by repetitive rowing motions. Symptoms and rate of progression ultimately determine the management which includes surveillance and/or conservative resection. There have been no documented cases of recurrence or malignant transformation.

Rehabilitation after a grade III latissimus dorsi tear of a soccer player: A case report.

BACKGROUND: Latissimus dorsi, grade III tendon tears are an uncommon injury. There are very few cases reported in the literature, but most importantly, no cases could be found that relate to soccer. OBJECTIVE: To present a successful, non-operative rehabilitation program for a professional athlete, after a grade III latissimus dorsi tear. CASE DESCRIPTION: A 37 year old healthy, elite professional soccer goalkeeper was injured during a championship game. The athlete fell on his left side with an outstretched and externally rotated upper extremity in order to catch a ball that was going very close to the left pole of his goal-post. After on-field and off-field clinical examinations, the diagnosis was a left latissimus dorsi tendon tear which was later confirmed by MRI as a grade III tear. INTERVENTION: During the first two weeks, intervention consisted of anti-inflammatory treatment and light therapeutic exercises. As the pain was subsiding and the strength was returning, the treatment shifted to purely strengthening and functional training. RESULTS: Four weeks after the injury, the athlete presented with pain 0/10 in all functional activities and full ROM in both active and passive movements. Before discharge, the athlete underwent a sport specific training program, without any complains, that cleared him to participate in normal training with the rest of the team. Three months after the injury the strength of the player's left shoulder was 5/5 in all movements. CONCLUSION: The protocol used yielded an accelerated return to sport (soccer) and function compared with other published research after a grade III latissimus dorsi tendon tear. One year later, the goalkeeper was still playing in the same competitive level without any re-injuries or complains, which means that this treatment protocol withstood the test of time.

Latissimus Dorsi and Teres Major Injuries in Major League Baseball Pitchers: A Systematic Review.

Injuries to the upper extremity in baseball pitchers are not uncommon, with extensive literature on shoulder and elbow pathology. However, there is minimal literature on isolated teres major (TM) and latissimus dorsi (LD) injuries. As a result, there is no consensus on an optimal treatment method. An extensive Medline search on studies focusing on the treatment of isolated LD and TM injuries in professional baseball pitchers was performed to explore this topic. Of the 20 retrieved articles, 5 met our inclusion criteria. There were a total of 29 patients who underwent conservative treatment and 1 who underwent surgical treatment. The average time required to return to pitching was 99.8 days in the conservative group and 140 days in the surgically treated group. Five patients in the conservative group suffered from complications and/or setbacks during their treatment and rehabilitation. The lone surgical patient suffered no complications, returned to preinjury form, and was elected an all-star the following year. The goal of this review is to provide a concise summary of the current literature in order to assist physicians when discussing treatment options with their patients.

Traumatic Tear of the Latissimus Dorsi Myotendinous Junction: Case Report of a CrossFit-Related Injury.

A case of a latissimus dorsi myotendinous junction strain in an avid CrossFit athlete is presented. The patient developed acute onset right axillary burning and swelling and subsequent palpable pop with weakness while performing a "muscle up." Magnetic resonance imaging examination demonstrated a high-grade tear of the right latissimus dorsi myotendinous junction approximately 9 cm proximal to its intact humeral insertion. There were no other injuries to the adjacent shoulder girdle structures. Isolated strain of the latissimus dorsi myotendinous junction is a very rare injury with a scarcity of information available regarding its imaging appearance and preferred treatment. This patient was treated conservatively and was able to resume active CrossFit training within 3 months. At 6 months postinjury, he had only a mild residual functional deficit compared with his preinjury level.

Retalho de grande dorsal para reconstrução de perda de substância por queimadura elétrica em membro superior / Latissimus dorsi flap for reconstruction of loss of substance caused by electric burn on upper limb

As queimaduras elétricas podem causar lesões graves e o músculo grande dorsal é uma opção para reconstrução dessas lesões. Paciente vítima de queimadura elétrica com lesão grave em membro superior esquerdo foi submetido à reconstrução com retalho pediculado do músculo grande dorsal. O paciente evoluiu bem, com resultado satisfatório. O retalho do músculo grande dorsal pediculado se mostrou seguro para cobrir exposição óssea em queimaduras elétricas em membro superior esquerdo.

Electrical burns can cause serious injuries and the latissimus dorsi reconstruction is an option for these lesions. Victim of electrical burn patient with severe lesions in the left upper limb underwent reconstruction with pedicled latissimus dorsi muscle. The patient progressed well, with satisfactory results. The flap of the large dorsal muscle pedicle proved insurance to cover exposed bone in electrical burns in the left upper limb.

Winging of scapula due to serratus anterior tear.

Winging of scapula occurs most commonly due to injury to long thoracic nerve supplying serratus anterior muscle. Traumatic injury to serratus anterior muscle itself is very rare. We reported a case of traumatic winging of scapula due to tear of serratus anterior muscle in a 19-year-old male. Winging was present in neutral position and in extension of right shoulder joint but not on "push on wall" test. Patient was managed conservatively and achieved satisfactory result.