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Effectiveness of tendon transfers for massive rotator cuff tears: a simulation study
D J Magermans1, E K J Chadwick, H E J Veeger
1Design, Construction and Production, Mechanical Engineering, Man Machine Systems, Delft University of Technology, Mekelweg 2, 2628 CD, The Netherlands. d.j.magermans@wbmt.tudelft.nl
Clinical Biomechanics (Bristol, Avon)
|February 18, 2004
Summary
Tendon transfer surgery can restore function after massive rotator cuff tears. Simulations show that transferring the teres major and latissimus dorsi muscles to the supraspinatus insertion offers the most effective improvement for shoulder function.
Area of Science:
- Orthopedic surgery
- Biomechanics
- Musculoskeletal modeling
Background:
- Massive rotator cuff tears often necessitate alternative surgical strategies beyond direct repair.
- Muscle transfer techniques are employed to compensate for lost rotator cuff functionality.
Purpose of the Study:
- To identify the most effective tendon transfer procedure for dysfunctional rotator cuffs.
- To compare the efficacy of different tendon transfer options using biomechanical simulations.
Main Methods:
- A biomechanical musculoskeletal model of the upper extremity was utilized.
- Simulations involved transferring latissimus dorsi, teres major, or both, to various rotator cuff insertion sites.
- Model parameters were adjusted to simulate rotator cuff tears and assess task performance with and without simulated transfers.
Main Results:
- Simulated transfers of teres major and latissimus dorsi, or teres major alone, to the supraspinatus or infraspinatus insertion yielded the greatest functional improvements (28-30%).
- All simulated transfer procedures resulted in statistically significant improvements in task performance.
- The effectiveness of transfer procedures varied significantly based on the chosen attachment site.
Conclusions:
- Tendon transfer of teres major and latissimus dorsi, or teres major alone, to the supraspinatus insertion is indicated as the most effective strategy for dysfunctional rotator cuffs based on simulations.
- Clinical decision-making should also consider practical factors such as subacromial space, muscle/tendon characteristics, and surgical feasibility.