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Does plate fixation prevent disc degeneration after a lateral anulus tear?
R J Moore1, J M Latham, B Vernon-Roberts
1Division of Tissue Pathology, Institute of Medical and Veterinary Science, Adelaide, South Australia.
Spine
|December 15, 1994
Summary
Plate fixation did not prevent disc degeneration in sheep after anular tearing. Limited healing of outer anular tears occurred in both plated and nonplated discs, showing no significant differences.
Area of Science:
- Spinal research
- Orthopedic surgery
- Biomechanical engineering
Background:
- Outer anular tears in sheep lumbar discs lead to progressive degeneration.
- Incomplete tear healing may stem from continuous movement at the lesion site.
Purpose of the Study:
- To evaluate if plate fixation aids peripheral anular tear healing.
- To determine if plate fixation minimizes disc degeneration.
Main Methods:
- A 4x10 mm cut was made in the lateral anulus of lumbar discs in 15 sheep.
- Plate fixation was applied to one disc in each sheep; controls were nonplated.
- Histologic examination was performed after 6 months.
Main Results:
- No significant differences in tear propagation, healing, or nuclear degeneration between plated and nonplated discs.
- Increased vascularization of the cartilage endplate on the operated side.
Conclusions:
- Plate fixation did not prevent disc degeneration following outer anular tears.
- Limited healing of the outer anulus was observed in both plated and nonplated groups.