Abstract:
STUDY DESIGN:The sheep model was used to investigate the development of disc degeneration after outer anular tearing. OBJECTIVES:The authors determined whether plate fixation promotes healing of peripheral anular tears and thereby minimizes disc degeneration. SUMMARY OF BACKGROUND DATA:A limited outer anular tear (similar to the rim lesion) in the sheep lumbar disc causes progressive and irreversible degeneration within 6 months. Incomplete healing of the tear may result from continued movement in the vicinity of the lesion. METHODS:In 15 sheep, a cut 4 x 10 mm was made in the lateral anulus of two nonadjacent lumbar discs, and a metal plate was fixed across one. Three sheep were killed immediately, and the remainder were killed after 6 months for histologic examination. RESULTS:There were no significant differences in propagation of the cut through the inner anulus, extent of healing, or extent of nuclear degeneration, between plated and nonplated motion segments after 6 months. Vascularization of the cartilage endplate was significantly increased on the operated side (P < 0.01), but remained unchanged on the nonoperated side. CONCLUSIONS:Disc degeneration was not prevented by this method of plate fixation, despite similar but limited healing of the outer anulus tear in both plated and nonplated levels.
journal_name
Spine (Phila Pa 1976)journal_title
Spineauthors
Moore RJ,Latham JM,Vernon-Roberts B,Fraser RDdoi
10.1097/00007632-199412150-00010subject
Has Abstractpub_date
1994-12-15 00:00:00pages
2787-90issue
24eissn
0362-2436issn
1528-1159journal_volume
19pub_type
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