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Related Experiment Video

Updated: Mar 31, 2026

Reverse Total Shoulder Arthroplasty
10:10

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Functional Outcomes After Reverse Total Shoulder Arthroplasty: Comparing Grammont and Lateralized Prosthesis Designs.

Monica C Iglesias1, Jorge A Izquierdo1, Michell Ruiz-Suarez1

  • 1Orthopaedic Surgery, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra" (INRLGII), Mexico City, MEX.

Cureus
|March 30, 2026
PubMed
Summary
This summary is machine-generated.

This study found no significant differences in shoulder function or complications between medialized and lateralized reverse total shoulder arthroplasty (RTSA) for fracture treatment. Larger studies are needed to confirm these findings for RTSA implants.

Keywords:
external rotationgrammont prosthesisinternal rotationlateralized prosthesisproximal humeral fracturereverse total shoulder arthroplasty (rtsa)

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Reconstructive surgery

Background:

  • Reverse total shoulder arthroplasty (RTSA) is a key treatment for complex proximal humerus fractures, especially in older adults.
  • Medialized (Grammont-type) and lateralized prostheses are two designs used in RTSA.
  • Implant design may impact patient outcomes, including range of motion and complications.

Purpose of the Study:

  • To compare rotational mobility, functional outcomes, and complication rates between medialized and lateralized RTSA designs.
  • The study focused on patients treated for proximal humerus fractures and related conditions.

Main Methods:

  • A retrospective comparative study (Level III evidence) included 27 patients treated with RTSA between 2007 and 2023.
  • Patients were grouped by prosthesis design: medialized (n=13) versus lateralized (n=14).
  • Functional outcomes were assessed using SANE, DASH, Constant-Murley, SST, ADLEIR, and EQ-5D scores; range of motion was also measured.

Main Results:

  • No statistically significant differences were found in external rotation (15° vs 20.7°), internal rotation, or other range-of-motion parameters between the groups.
  • Functional outcome scores (SANE, DASH, Constant-Murley, SST, ADLEIR, EQ-5D) were similar across both prosthesis designs.
  • Complication rates were 23.1% for medialized and 7.1% for lateralized RTSA, but this difference was not statistically significant (OR 3.9, p=0.23).

Conclusions:

  • Current evidence suggests no significant differences between medialized and lateralized RTSA designs regarding rotational mobility, functional outcomes, or complication rates.
  • The study's small sample size may limit its power to detect clinically relevant differences.
  • Further prospective research with larger cohorts is recommended to definitively assess the comparative effectiveness of different RTSA implant designs.