Translating humeral posture into prosthetic planning: BMI, humeral abduction resting angle, and simulated range of motion in an Altivate 135° reverse shoulder arthroplasty model.

ABSTRACT:

Background

Scapular notching in reverse total shoulder arthroplasty is more prevalent in slim patients and less frequent in obese patients. Current arthroplasty planning software often lacks the integration of patient-specific arm positioning when aiming to predict impingement-free motion. This study hypothesizes that obese patients exhibit a more abducted humeral resting position, measured as the humeral abduction resting angle (HARA) and reverse shoulder arthroplasty (RSA)-HARA, and that greater abduction increases impingement-free range of motion (ROM).

Methods

Standing radiographs of 141 shoulders (121 patients) were analyzed to measure HARA (humeral center line to vertical plumb line) and RSA-HARA, defined as the angle between the humeral center line and supraspinatus f

SUBMITTER: Shao W 

PROVIDER: S-EPMC12490615 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature