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orthopaedics study examination medicine knee spondylo listhesis elbow children thr biomechanics shoulder bone tumor anatomy hip biomechanics intra articular injection steroid aspiration bone non union healing seronegative spondyloarthropathy dvt prophylaxi distal femur foot injury general priciples lesion margin perioseteal reaction radiological wrist tkr biomecha distal humerus racture brachial plexus nerve injury ligaments injury around knee basic coronoid proximal ulna radial head terrible triad replacement tribology ankylosing spondylitis biochemistry