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Related Concept Videos

Anatomical Positions01:11

Anatomical Positions

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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...
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Related Experiment Video

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Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
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Lateralization and inclination angle in reverse arthroplasty-what do we know?

Anders L Ekelund1, Didier Poncet2

  • 1Department of Orthopaedics, Capio St Görans Hospital, Stockholm, Sweden.

Shoulder & Elbow
|November 15, 2024
PubMed
Summary

Modern reverse shoulder arthroplasty designs aim to reduce impingement and improve rotation. However, evidence for improved rotation is lacking, and these design changes may increase risks like glenoid loosening and fractures.

Keywords:
lateralizationneck–shaft anglereverse shoulder arthroplasty

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Reverse Total Shoulder Arthroplasty
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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Implant Design

Background:

  • The Grammont design for reverse shoulder arthroplasty (RSA) has evolved.
  • Trends include decreasing inclination angle and increasing glenoid lateralization.

Purpose of the Study:

  • To evaluate the impact of reduced inclination angle and glenoid lateralization in RSA.
  • To assess if these modifications improve rotational restoration and reduce impingement (notching).

Main Methods:

  • Review of design trends in reverse shoulder arthroplasty.
  • Analysis of biomechanical implications of altered implant geometry.

Main Results:

  • Design changes aim to reduce humeral-glenoid impingement and potentially improve rotation.
  • Limited evidence supports improved rotational restoration with these modifications.
  • Glenoid lateralization may increase risks of glenoid loosening and acromion/scapula spine fractures.

Conclusions:

  • Further randomized studies are necessary to determine the optimal design for reverse shoulder arthroplasty.
  • Balancing impingement reduction with potential adverse effects is crucial for RSA implant development.