shoulder anatomy and biomechanics

[29], SLAP lesions occur during the ending deceleration phase of throwing, because of a traction force wielded by the long head of biceps on the glenoid labrum. Anatomy and biomechanics of the shoulder in throwing, swimming, gymnastics, and tennis. As the most mobile joint in the body, the shoulder is structurally insecure. ritish Journal of … The ball-shaped humeral head rotates and glides on a shallow scapular cup. Specular lesions can be described for the posterior aspect of the labrum: a reverse Bankart lesion involves the posterior labrum and the posterior band of inferior glenohumeral ligament [25]; a POLPSA is a posterior labroligamentous sleeve avulsion, that if chronic could become a Bennett lesion (an extraarticular calcification along the posteroinferior glenoid neck close to the posterior band of the glenohumeral ligament) [26]. As far as the superior labrum is concerned, a very common lesion in throwing overhead athletes is the SLAP (superior labrum anterior and posterior) tear. Affiliation 1 Orthopedic Biomechanics Laboratory, Mayo Clinic Rochester, The Mayo Foundation, Rochester, MN 55901, USA. Capsular redundancy, both anterior and inferior and posterior, is a very common find in atraumatic multidirectional instability. The glenoid track influences the risk of engagement of a Hill–Sachs lesion: if the bony loss in the humeral head remains within the glenoid track there is no possibility that the Hill–Sachs lesion overrides the glenoid rim. iomechanics and treatment of acromioclavicular and sternoclavicular joint injuries. The fol­lowing description is based on sound anatomic knowledge along with integration of the pertinent literature. (2010). The constitutional trait of laxity facilitates extensive motion in multiple planes and may be essential to athletic performance. Epub 2017 Nov 28. As the most mobile joint in the body, the shoulder is structurally insecure. All the bony characteristics influence stability, therefore changes in bony anatomy could result in shoulder instability. T he joints of the shoulder com plex have to rely on adjacent ligam ents and m uscles to provide stability. eCollection 2018 Nov 18. Moreover, SLAP lesions are common in contact athletes: Funk and Snow [30] reported a 35% incidence of SLAP tears, arthroscopically diagnosed, in 51 rugby players’ shoulders. Development of the human shoulder joint during the embryonic and early fetal stages: anatomical considerations for clinical practice. There are different kinds of labrum lesions and it’s very important not to confuse tears with anatomical variants that don’t require surgical repair, like sublabral foramen associated with cord-like middle glenohumeral ligament or meniscoid labrum [. It could be damaged more frequently at the glenoid insertion (anteroinferior glenoid rim), but also in the middle part or at the humeral insertion [33]. T he shoulder com plex has the greatest m o- bility of all joints. Lippincott Raven eds. J Biomech. Navigation best viewed on larger screens. A Hill–Sachs lesion is an impact fracture occurring after one or more traumatic anterior shoulder dislocations and involves the posterior-lateral articular surface of the humeral head (Fig.  |  Course Length: 3.0 contact hours Instructional Level: Beginner Course Goals and Objectives: Goal: To instruct the student, through self-paced study, of the anatomy and basic biomechanics of the human shoulder. The rotator interval contains multiple static stabilizers of the shoulder, and its integrity is important for anterior and inferior stability of the shoulder, especially when the shoulder is adducted. 5. 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