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78 patients with GOH who were treated surgical/y between 1988 and 1994 have been evaluated. Results of 26 of them (38 hips) with a fol/ow up period have been reviewed. Mean fol/ow up period was three years. In the age group 1-5 there was 27 hips and the results were as fol/ows: 11 excel/ent, 12 good and 4 fair. There.was 4 excel/ent, 1 good, 3 fair and 3 poor results in 11 hips belonging to patients who were older than 6 years. In the lalter age group al/ hips with bad results had hip stiffness. Avascular necrosis percentage was %33 in the younger age group and 45% in the older. In 6 of 34 hips which were treated with open reduction there was hip stiffness. We treated 4 of these 6 hips with manipulation under general anesthesia and in none of them a good result was obtained. Less than half the normal range of motion of the hip af ter surgical treatment can be termed as "hip stiffness". Hip stiffness is a demanding problem in GOH surgery and is difficult to manage once it has developed. AI/ effort must be directed to prevention of hip stiffness. Unfortunately, one cannot achieve satisfactory results in treatment of hip stiffness by methods such as delayed rehabilitation, manipulation under general anesthesia or surgical release. In order to prevent hip stiffness a stable reduction, a short period of stay in east and early rehabilitation fol/owing the east removal is mandatory. In those hips treated by radical reduction, manipulation under general anesthesia must always be employed immediately af ter removal of the east.