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Hamstring regrowth following harvesting for ACL reconstruction: The lizard tail phenomenon
Henry T Leis1, Timothy G Sanders, Karl M Larsen
1Department of Orthopedics, Wilford Hall Medical Center, San Antonio, Tex, USA.
The Journal of Knee Surgery
|August 29, 2003
Summary
The semitendinosus tendon regenerates effectively after anterior cruciate ligament (ACL) reconstruction surgery. Studies show significant recovery in histological and biomechanical properties over time.
Area of Science:
- Orthopedic Surgery
- Regenerative Medicine
- Biomedical Engineering
Background:
- Anterior cruciate ligament (ACL) reconstruction often utilizes autografts, such as the semitendinosus tendon.
- Understanding the regenerative capacity of harvested tendons is crucial for optimizing surgical outcomes.
Purpose of the Study:
- To evaluate the regeneration of the semitendinosus tendon after harvest for ACL reconstruction in a rabbit model.
- To assess the histological and biomechanical properties of the regenerated semitendinosus tendon.
Main Methods:
- Rabbits underwent semitendinosus tendon harvest for ACL reconstruction.
- Regenerate tendons were assessed at 16 and 28 weeks post-harvest using MRI, gross pathology, histology, and biomechanical testing.
Main Results:
- Complete regeneration of the semitendinosus tendon was observed in all specimens at both 16 and 28 weeks.
- Biomechanical strength reached 23% of normal at 16 weeks and 62% at 28 weeks post-harvest.
Conclusions:
- The semitendinosus tendon demonstrates robust regeneration capabilities after harvest for ACL reconstruction.
- Regenerated tendons regain significant, albeit incomplete, biomechanical strength, supporting its use in ACL reconstruction.