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A questionnaire survey was completed by 77 patients in 9 males and 68 females between 1 and3 years after surgery. Mean age at surgery was 66.1 (range, 49 to 87).In the 3 years before surgery 40 (51.9%) patients were participating in sport. By 1 to 3 yearsafter surgery 43 (55.8%) patients were participating in sport. A total of 33 (82.5%) had returnedto their sporting activities by 1 to 3 years after surgery in groups who played sports beforesurgery and 7 (17.5%) were unable to do with the most common reason being “cannot move asmuch as I wanted”. On the other hand, a total of 10 (27%) had started playing sports aftersurgery. The sports activities after surgery were the most common being walking, radiocalisthenics, and swimming as low-impact sports. A total of 27 (73%) did not play sports beforeor after surgery with the most common reason being “fear of damage to the hip joint”.In conclusion, when Japanese patients who have undergone THA for hip dysplasia choose toparticipate in sports, orthopedic surgeons should provide information with which to evaluate therisk of sports activity and recommend appropriate sports activity.Thursday, October 7, 2010, 11:00-11:20Session B4: Ethnic and Gender Issues in TKR.Gender Differences in Japanese Osteoarthritic Knee Joint Geometry*Shinro Takai - Teikyo University School of Medicine - Tokyo, Japan*Email: takai@kta.att.ne.jp562 osteoarthritic knees rated as stage 1 or more according to Kellgren's osteoarthritic kneeclassification were selected randomly and analyzed radiologically. Eighty cases with the heightof 155 cm-160 cm, for which a large number of male and female cases are available (34 malecases, 46 female cases) were extracted for analysis. The values measured were significantlylarger in male than in female in any region. In order to clarify differences in morphologybetween the sexes, the ratio between the values measured of various regions was computed. Asa result, the value obtained by dividing the length of medial femoral condyle in anteriorposteriordirection and the depth of medial femoral condyle in proximal-distal direction by thewidth of femur at articular level was 0.87±0.03, 0.56±0.03 in female against 0.81±0.04,0.52±0.03 in male, respectively. The value obtained by dividing the length of medial tibiacondyle in anterior-posterior direction by the width of tibia at articular level was 0.61±0.05 infemale against 0.59±0.04 in male. Anteversion of the femur in female was higher than that inmale.When the differences between the sexes were studied, the values measured of various regionswere significantly larger in males than in females even in the group of the same height.Morphologically, the knee of males tended to have a larger width than that of females.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]