Measurements of shoulder prosthesis positioning
نویسندگان
چکیده
One of the most difficult aspects of shoulder arthroplasty is retroversion. The ideal angle is about 30 of posterior rotation of humeral head with regard to the frontal plane so that the humeral head squarely faces the glenoid surface in the resting position.The axis, lateral epicondylemedial epicondyle is often taken as reference and serves as landmark in many arthroplasty instrumentation. [1,2] Clinical experience has shown that estimating a 30 angle in space is definitely not easy even with the help of diverse goniometers.
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