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Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
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Does Humeral Component Lateralization in Reverse Shoulder Arthroplasty Affect Rotator Cuff Torque? Evaluation in a
Kevin Chan1, G Daniel G Langohr1, Matthew Mahaffy1
1Bioengineering Research Laboratory, Roth|McFarlane Hand and Upper Limb Center, St Joseph's Health Care, Western University, 268 Grosvenor Street, London, ON, N6A 4L6, Canada.
Clinical Orthopaedics and Related Research
|June 16, 2017
Summary
Humeral component lateralization in reverse total shoulder arthroplasty (RTSA) enhances rotator cuff torque. This study found increased torque with greater lateral offset, particularly for the anterior cuff, suggesting potential benefits for shoulder function.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Biomedical Engineering
Background:
- Reverse total shoulder arthroplasty (RTSA) aims to improve shoulder function.
- Humeral component lateralization may enhance rotator cuff biomechanics and torque.
Purpose of the Study:
- To investigate the impact of humeral component lateralization on anterior and posterior rotator cuff torque in vitro.
- To quantify the effect of varying lateral offset on shoulder joint biomechanics.
Main Methods:
- Eight cadaveric shoulders underwent testing using a custom RTSA simulator.
- Humeral component lateralization was varied across five levels (15-35 mm).
- Rotator cuff torques were measured at different abduction and rotation angles.
Main Results:
- Humeral lateralization significantly affected anterior rotator cuff torque across various abduction and rotation angles.
- Posterior rotator cuff torque was influenced by lateralization at 0° abduction, with mixed effects on internal/external rotation.
- Increasing lateral offset generally increased torque, particularly for the anterior cuff.
Conclusions:
- Humeral component lateralization positively influences rotator cuff torque.
- Lateral offset is a critical factor in RTSA biomechanics.
- Further research is needed to assess clinical implications and potential adverse effects of increased offset.
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