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Cellular survival and proliferation in autogenous flexor tendon grafts
J W Ark1, R H Gelberman, S O Abrahamsson
1Massachusetts General Hospital, Department of Orthopaedic Surgery, Boston 02114.
The Journal of Hand Surgery
|March 1, 1994
Summary
Extrasynovial tendon grafts undergo cell death and repair, acting as scaffolds. Intrasynovial tendon grafts show better fibroblast survival, indicating differing nutritional needs for tendon healing.
Area of Science:
- Orthopedic Surgery
- Regenerative Medicine
- Histology
Background:
- Autogenous tendon grafts are used in reconstructive surgery.
- Understanding fibroblast behavior in grafted tendons is crucial for optimizing healing.
- The microenvironment (synovial vs. non-synovial) may influence graft viability.
Purpose of the Study:
- To investigate fibroblast survival and proliferation in intrasynovial and extrasynovial autogenous flexor tendon grafts.
- To compare the cellular response and healing characteristics of different tendon graft types under controlled motion.
Main Methods:
- Hindlimb intrasynovial and extrasynovial donor tendons were grafted into canine forepaw digits.
- Controlled early passive motion was applied to the grafts.
- Intravital histology, confocal microscopy, DNA content, and DNA synthesis were assessed at 10 days, 3 weeks, and 6 weeks.
Main Results:
- Extrasynovial grafts showed initial cell necrosis followed by repopulation and neovascularization.
- Intrasynovial grafts maintained higher cell viability with less necrosis and ingrowth.
- DNA content and synthesis were lower in intrasynovial grafts compared to extrasynovial grafts.
Conclusions:
- Extrasynovial tendons function as scaffolds, undergoing necrosis and repair.
- Intrasynovial tendon fibroblasts exhibit superior survival post-grafting.
- Differences in nutritional supply and metabolic demands likely explain the distinct behaviors of intrasynovial and extrasynovial tendon grafts.