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Optimal glenosphere size cannot be determined by patient height.

Bradley S Schoch1, Terrie Vasilopoulos2, Gregory LaChaud3

  • 1Department of Orthopedic Surgery, Mayo Clinic, Jacksonville, FL, USA.

Journal of Shoulder and Elbow Surgery
|September 11, 2019
PubMed
Summary
This summary is machine-generated.

Surgeon choice of glenosphere size in reverse shoulder arthroplasty (RSA) correlates with patient height and sex. However, patient height does not dictate optimal glenosphere size for improving range of motion or outcomes.

Keywords:
Reverse shoulder arthroplastyglenosphereglenosphere sizeheightoptimaloutcomesrange of motionsex

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Patient outcomes research

Background:

  • Glenosphere size is a surgeon-controlled factor impacting reverse shoulder arthroplasty (RSA) outcomes.
  • No objective guidelines exist for selecting optimal glenosphere size.
  • Patient height is a potential factor influencing glenosphere size selection.

Purpose of the Study:

  • To evaluate the relationship between patient height, glenosphere size, and range of motion (ROM) after RSA.
  • To determine if patient height can guide the selection of optimal glenosphere size.
  • To analyze the impact of glenosphere size on patient-reported outcome measures (PROMs).

Main Methods:

  • Retrospective review of 589 primary RSAs using a single RSA system.
  • Patients grouped by glenosphere size (38mm or 42mm).
  • Analysis of height and sex for predicting glenosphere size selection; comparison of ROM and PROMs improvements based on glenosphere size and height.

Main Results:

  • Height and sex strongly associated with surgeon's choice of glenosphere size (shorter patients received 38mm, taller patients received 42mm).
  • No statistically significant interaction between glenosphere size and height on improvements in ROM or PROMs.
  • Optimal height ranges for maximizing postoperative outcomes based on glenosphere size were not identified.

Conclusions:

  • Surgeon selection of glenosphere size is influenced by patient height and sex.
  • Current data do not support selecting glenosphere size based on patient height to optimize ROM or PROMs.
  • Surgeons should consider factors beyond patient height when choosing glenosphere size for RSA.