Cadaveric study using six specimens to quantify the kinematic and kinetic consequences of placing a humeral hemiarthroplasty 5 mm or 10 mm too high relative to the tuberosities, measuring passive abduction range and rotator cuff moment arms in the scapular plane.
When a post-arthroplasty shoulder shows limited abduction and weak elevation, consider proud humeral component height — even a 5 mm error biomechanically degrades both arc of motion and rotator cuff moment arms, and in fracture hemiarthroplasty the same penalty applies if tuberosities are fixed too distally.
Cadaveric study using six specimens to quantify the kinematic and kinetic consequences of placing a humeral hemiarthroplasty 5 mm or 10 mm too high relative to the tuberosities, measuring passive abduction range and rotator cuff moment arms in the scapular plane.
When a post-arthroplasty shoulder shows limited abduction and weak elevation, consider proud humeral component height — even a 5 mm error biomechanically degrades both arc of motion and rotator cuff moment arms, and in fracture hemiarthroplasty the same penalty applies if tuberosities are fixed too distally.