Throwers Exostosis

synonyms: Bennett's lesion

Throwers Exostosis ICD-9

Throwers Exostosis Etiology / Epidemiology / Natural History

• Throwers exostosis = bony posterioinferior prominencde at the posterior insertion of the inferior glenohumeral ligament.
• Felt to be related to repetitive throwing leading to traction osteophyte formation.
• Occurs in 20% of major league pitchers (Wright RW, AJSM 2004;32:121). Generally asymptomatic

Throwers Exostosis Anatomy

Throwers Exostosis Clinical Evaluation

• Posterior shoulder pain during ball release
• LocaI discomfort and tenderness in the posterior shoulder with referred pain to the deItoid region.
• May be unable to continued throwing due to posterior shoulder, and referred deltoid pain.

Throwers Exostosis Xray / Diagnositc Tests

• Bennett's or modified Bennett's view of the shoulder demonstrates exostosis on inferior aspect of glenoid.

Throwers Exostosis Classification / Treatment

• Shoulder arthroscopy, joint capsule incised on the posterior side of the labrum directly over the exostosis. Exostosis then resected with shaver or bur.

Throwers Exostosis Associated Injuries / Differential Diagnosis

Throwers Exostosis Complications

• Inabilitly to return to pre-op level

Throwers Exostosis Follow-up Care

• 55% return to preinjury level of competition after arthroscopic excision (Meister K, AJSM 1999;27:133)

Throwers Exostosis Review References

• Wright RW, AJSM 2004;32:121
• Meister K, AJSM 1999;27:133
• Bennett GE: Elbow and shoulder lesions of baseball players. Am J Surg 98: 484–492, 1959
• Bennett GE: Shoulder and elbow lesions distinctive of baseball players. Ann Surg 126: 107–110, 1947
• Bennett GE: Shoulder and elbow lesions of the professional baseball pitcher. J Am Med Assoc 117: 510–514, 1941