Little research has been done on the prevalence of Kienböck's disease, and there is no consensus on the relationship between Kienböck's disease and negative ulnar variance. The goal of this cross-sectional study was to determine the prevalence of Kienböck's disease in middle-aged and elderly Japanese women and to clarify the relationship between Kienböck's disease and negative ulnar variance. The authors analyzed plain radiographs of both hands in women 40 years and older residing in the community to investigate the prevalence of Kienböck's disease and the relationship between Kienböck's disease and negative ulnar variance. Kienböck's disease was seen in 7 of the 572 participants. In the group with Kienböck's disease, ulnar variance did not differ significantly between affected (0.3 mm; SD, 1.5) and unaffected (0.3 mm; SD, 1.0; P=.285) sides. No significant difference was seen in ulnar variance values between the affected side in the group with Kienböck's disease and the normal group (P=.118). The number or proportion of participants with negative ulnar variance did not differ significantly between the affected side in the group with Kienböck's disease (3 of 7) and the unaffected side in the group with Kienböck's disease (1 of 7; P=.237) and between the affected side in the group with Kienböck's disease and the normal group (111 of 504; P=.189) by chi-square test. The prevalence of Kienböck's disease was 1.2% in middle-aged and elderly Japanese women. Negative ulnar variance is not a contributing factor to Kienböck's disease.

No abstract

No abstract

: Purpose : We verified electromyogram activity during hip flexion under different pelvic rotation positions, investigated the effects of pelvic rotational position and defined the difference between males and females. Subjects : 15 healthy adults 5 male, 10 female with a mean age of 28.8 years participated in this study. Method : We recorded surface electromyograms of the tensor fasciae latae muscle TFL , rectus femoris muscle RF , biceps femoris muscle BF , semitendinosus muscle ST , and the bilateral internal oblique muscle OI during flexion of the hip joint in a supine position with three different pelvis rotation conditions. Results : Males showed no significant differences at all muscle activity levels. Meanwhile, TFL muscle activities were significantly higher for females in other side rotation of the pelvis than in the pelvis neutral position p 0.05 . Moreover, opposite side of OI muscle was activated significantly highly in both side rotation position p 0.05 . Conclusion : Generally, the transverse diameter of the pelvis in females is longer than that in males. When the lower extremity is elevated in the pelvis rotation positions, the moment of force on the pelvis is thought to be higher in females. Therefore, the stabilizing muscles of the pelvis, like the OI, need to be activated isometrically in females.

Atomic Bomb Memorial HospitalWe reviewed the postoperative results of anterior spinal fusion for 17 cases of cervical ossification of the posterior longitudinal ligament with disc lesion. The mean age at surgery was 56.9 years and the mean preoperative period was 15.6 months.