A Radiographic Study of the Clear Zone Around Pedicle Screws.

概要

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The purpose of this study is to evaluate the location and time of appearance for the clear zone around pedicle screws and to investigate the relationship between appearance time and bone union (P. L. F.). Subjects included 33 patients examined from July to Sep 1995 who were investigated radiographically. They consisted of 18 men and 15 women, ranging in age from 22-73 years with a mean of 51 years. Follow-up duration was 7 months. Evaluation of bone union was carried out according to modified Matsuzaki's criteria. Excellent or good cases achieved sucressful bone union while possible or nonunion on cases failed to achieve bone union. 8 patients had a clear zone which appeared within 6 months after surgery, mean 3.8 months. 8 patients had sacral stabilization performed and there were 3 patients with sacral clear zone. 25 patients without a clear zone were classified as successfu. 2 of 8 patients with a clear zone were classified as failure. In regard to development of the clear zone, 6 months after surgery is the important period. If a clear zone is not observed within 6 months after surgery, the possibility of successful bone union is high.
西日本整形・災害外科学会の論文