This 2005 review by Iannotti et al. uses 21-cadaver active/passive shoulder models and finite-element analysis to quantify how far humeral and glenoid components can deviate from anatomic position before causing measurable impingement, motion loss, instability, or implant stress in total shoulder arthroplasty.
When planning TSA, aim for humeral head reconstruction within 4 mm of the native center of rotation — especially avoiding inferior offset.
And correct glenoid retroversion with eccentric anterior reaming rather than compensatory humeral anteversion, which the data show is biomechanically ineffective for restoring stability.
This 2005 review by Iannotti et al. uses 21-cadaver active/passive shoulder models and finite-element analysis to quantify how far humeral and glenoid components can deviate from anatomic position before causing measurable impingement, motion loss, instability, or implant stress in total shoulder arthroplasty.
When planning TSA, aim for humeral head reconstruction within 4 mm of the native center of rotation — especially avoiding inferior offset.
And correct glenoid retroversion with eccentric anterior reaming rather than compensatory humeral anteversion, which the data show is biomechanically ineffective for restoring stability.