Natural History of the Primary Osteoarthritis of the Hip

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Natural histories of 23 patients (28 hips) with primary osteoarthritis were radiologically examined and its etiology was discussed.There were two types in radiological development of the process, according to the direction of the displacement of the femoral head; (1) supero-lateral type (22 hips), which had a female prevalance, a fast development of the stage and osteophyte formation, (2) medial type (6 hips), which had a slow development of the stage and no osteophyte formation. In the cases of early stage in the supero-lateral type, their displaced femoral heads were reduced by hip abduction. Radiological findings in the medial type were similar to those of inflammation disorders such as ankylosing spondylitis and arthritic of the hipIn conclusion, there is close relationship between the medial type and inflammation of the hip joint. However, the etiology of the supero-medial type is considered as the muscle imbalance around the hip, which induces supero-lateral displacement of the head.
西日本整形・災害外科学会の論文