Assessment of Roentgenographic Changes in the Femoral Shaft after Femoral Endoprosthetic Replacement.
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We studied changes in the femoral shaft after femoral endoprosthetic replacement from the viewpoint of bone remodeling.We evaluated 39 hips followed-up for 6 months to 6 years and 1 month. The width of bone, medulla and cortex were measured at the end level of the stem on each radiograph taken after surgery and after over 6 months. Changes were classified into 6 types of bone remodeling according to Iwasaki's classification.The types (TYPE I, IV) in which the cortex was thickening were frequently detected as having an unstable stem. Stress and minor mobility of the stem-end due to ustability may have caused bone remodeling which controled resorption of bone in the endosteum and promoted formation of bone in the periosteum. Thin cortex and enlarge-ment of the medullary cavity in type V was caused by aging and osteoporosis. It was assumed that this change in bone remodeing coutribute to progression of the unstable stem and sinking of the stem in the femoral shaft.
- 西日本整形・災害外科学会の論文
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