Clinical pathology and treatment of prearthrosis of the hip.
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We have studied the clinical pathology and treatment of prearthrosis by analyzing clinical, radiological and arthroscopic data on secondary coxarthrosis due to congenital dislocation of hip the joint (CDH) .<BR>In the clinical and radiological studies, we examined 87 joints in 71 patients of prearthrosis out of 300 joints of 150 cases of coxarthrosis due to missed CDH. The symptoms occurred after adolescence and so CDH was not discovered in infancy and childhood. Also, in the arth-roscopic study, we examined 24 joints in 19 cases of pre-arthrosis including both those which were surgically treated and those which were not.<BR>There was a high incidence of prearthrosis in the cases of coxarthrosis due to missed CDH. The distribution of this symptom was spread through the age groups, but there were less cases in the 60s and 70s groups. As for the symptoms of the disease, 60% of the patients had arthralgia and the remainder had lower back pain, thigh pain, and knee joint pain. The initial symptoms occurred mostly in the teens and 20s, and about 50 % received an initial examination less than one year from the occurrence of the first symptoms.<BR>Classification by joint compatibility on radiographies showed that there were more type A (remained acetabular dysplasia) than type B (remained subluxation), but type B tended to be in a more advanced early stage than type A. Therefore, it can be observed that type B, the group with worse compatibility, progresses more quickly in coxarthrosis than type A does, the group with better compatibility.<BR>In arthroscopies of the hip which we have performed, a slight irregularity of the femoral head cartilage and fibrillation of the cartilage in the acetabulum were observed. We could not diagnose any symptoms in 20 % of the arthroscopy cases.<BR>With respect to treatment, 1) coxarthrosis which has poor compatibility with an insufficient acetabular covering and a CE angle of less than 10° should be operated on, since it is presumed that coxarthrosis progresses quickly in the early stage, and 2) coxarthrosis which has a slightly better compatibility with an insufficient acetablar covering and a CE angle of less than 10° is also suitable for operation. But for the coxarthrosis which does not belong to either 1) or 2), we consider that it is better to continue observing the natural progress and not to operate.
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