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Shielding of augmented tendon--tendon repair
G J Rogers1, B K Milthorpe, K Schindhelm
1Centre for Biomedical Engineering, University of New South Wales, Sydney, Australia.
Biomaterials
|July 1, 1995
Summary
Digital extensor tendon reconstruction using augmentation devices and adhesion barriers showed promising results. Both autogenic and xenogenic grafts maintained strength and function, indicating improved healing in an ovine model.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Regenerative Medicine
Background:
- Tendon injuries require effective reconstruction methods.
- Autogenic and xenogenic grafts are used for tendon repair.
- Adhesions can compromise graft function and strength.
Purpose of the Study:
- To evaluate the strength and function of autogenic and xenogenic digital extensor tendon reconstructions.
- To compare two augmentation methods: suture with a polyester tube (A) and augmentation with bovine pericardium shielding (S).
Main Methods:
- An ovine model was used to reconstruct digital extensor tendons.
- Graft junctions were created using suture augmented with a woven polyester tube (A) or shielded with chemically-treated bovine pericardium (S).
- Mechanical strength and functional recovery were assessed up to 12 weeks.
Main Results:
- Both augmentation methods (A and S) resulted in a full range of motion by 12 weeks.
- Mechanical strength at graft-host repair sites was similar for both A and S groups (131 +/- 25 N).
- Xenografts maintained mid-portion strength (366 +/- 97 N), while unprotected autografts lost significant strength (380 N to 120 N) due to adhesions.
Conclusions:
- Augmentation devices coupled with adhesion barriers enhance initial reconstruction strength.
- Shielding is crucial for maintaining autograft strength by preventing adhesions.
- This approach improves functional recovery during the host repair period up to 12 weeks.