Prosthetic positioning in total shoulder arthroplasty.
Accurate positioning of the prosthetic humeral head is necessary to reproduce normal glenohumeral kinematics and to avoid damage to the rotator cuff and impingement on the glenoid component or coracoacromial arch. Proper positioning of the head requires accurate placement of the stem and prosthetic designs that allow the head position to adapt to the variations in both normal and pathologic humeral anatomy. Glenoid malpositioning can lead to both humeral instability and increased stress of the glenoid component that may lead to premature glenoid loosening. This review summarizes the cadaveric and finite-element model that defines the abnormalities associated with humeral and glenoid component malpositioning.
Iannotti
Joseph P
JP
Cleveland Clinic Lerner College of Medicine, and Dept. of Orthopaedic Surgery A-41, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland OH, 44139, USA.
Spencer
Edwin E
EE
Winter
Uwe
U
Deffenbaugh
Daren
D
Williams
Gerald
G
D019643:Arthroplasty, Replacement / Q000009:adverse effects / Q000379:methods*; D001696:Biomechanical Phenomena; D002102:Cadaver; D006801:Humans; D006811:Humerus; D007595:Joint Prosthesis; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D012785:Shoulder Joint