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Updated: Nov 9, 2025
Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
Published on: March 12, 2021
Relationship Between Glenoid Component Shift and Osteolysis After Anatomic Total Shoulder Arthroplasty:
Eric T Ricchetti1, Bong-Jae Jun, Yuxuan Jin
1Department of Orthopaedic Surgery, Orthopedic and Rheumatologic Institute (E.T.R., J.C.H., T.E.P., and J.P.I.), Department of Biomedical Engineering, Lerner Research Institute (B.-J.J. and K.A.D.), and Department of Quantitative Health Sciences (Y.J. and J.E.D.), Cleveland Clinic, Cleveland, Ohio.
Glenoid component shift is common after total shoulder arthroplasty (TSA), often involving increased inclination. Central anchor peg osteolysis (CPO) is less frequent, and neither shift nor CPO impacted clinical outcomes in this study.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Radiology
Background:
- Anatomic total shoulder arthroplasty (TSA) aims to restore shoulder function.
- Glenoid component positioning is critical for TSA success.
- Assessing component migration and bone reaction is essential for long-term outcomes.
Purpose of the Study:
- To evaluate glenoid component position and radiolucency after TSA.
- To analyze component shift and central anchor peg osteolysis (CPO) using 3D CT.
- To identify factors associated with component shift and CPO.
Main Methods:
- Sequential 3D CT scans (preoperative, early postoperative, 2-year follow-up) of 152 patients undergoing TSA.
- Definition of glenoid component shift (≥3° change in version or inclination).
- Assessment of CPO and correlation with patient-specific glenoid morphology and component positioning.
Main Results:
- Glenoid component shift occurred in 51% of patients, with increased inclination being most common.
- CPO was observed in 13% of patients, more frequent in those with component shift.
- Specific preoperative glenoid morphologies (Walch B2, B3) and joint-line medialization were associated with shift or CPO, but not worse clinical outcomes.
Conclusions:
- Glenoid component shift is a common finding after TSA, often in the direction of increased inclination.
- Most patients with component shift do not develop CPO.
- Longer follow-up is necessary to establish the link between shift, CPO, and eventual loosening.
