著者

橋本 卓 金谷 整亮 池田 均 塚西 茂昭 信原 克哉 田中 道夫

出版者

日本肩関節学会

雑誌

肩関節 (ISSN:09104461)

巻号頁・発行日

vol.14, no.2, pp.245-248, 1990-09-01 (Released:2012-11-20)

参考文献数

4

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We have measured the intra-articular pressure simultaneously with arthrography of the shoulder. In this study, changes in the intra-articular pressure were examined in unstable shoudlers associated with loose shoulder, rotator interval lesion, and traumatic recurrent anterior dislocaiton.Of the 731 shoulders (731 patients) in which intra-articular pressure was me a sured from 1981, the measurement was possible in 254 shoulders (254 patients). A total of 91 shoulders, consisting of 20shoulders with traumatic recurrent anterior dislocation,40 loose shoulders, and 31 shoulders with rotator interval lesion, were evaluated.Physiologic saline was in f used into the joint, and canges in the intra-articular pressure were recorded as electric signals through a transducer. The arm was moved up and down passively, and the pressure was measured at intervals of 10.In loose shoulder and rotator interval l e sion, the intra-articular pressure decreased as the arm was lifted higher, but the decreases were smaller than in normal shoulders. In these groups, there was a smaller pressure increase to the position of maximum uplift with a smaller peak value and within a narrower range than in the normal group. These findings were more notable in the shoulders with an FSH angle of 81' or greater. These results suggest that the intra-articular pressure reflects the joint capacity.In traumatic recurrent anterior dislocation, however, the decrease in the pressure in an early stage of arm lifting was the greatest among all groups including the normal group, and the pressure increase with arm lifting was gentler in shoulders with an FSH of 80 °or less, unlike in the other two groups.The changes in the intra-articular pressure in shoulders with traumatic recurrent anterior dislocation may be explained by disruption of the anterior capsular mechanism and muscle contraction due to anxiety over the possibility of dislocaiton during arm lifting as well as the looseness of the articular capsule.

著者

中溝 寛之 橋本 淳 中村 真里 金谷 整亮 信原 克哉 中村 康雄

出版者

日本肩関節学会

雑誌

肩関節 (ISSN:09104461)

巻号頁・発行日

vol.28, no.2, pp.355-358, 2004-08-30 (Released:2012-11-20)

参考文献数

5

被引用文献数

1

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The purpose of this study was to investigate the characteristics of baseball pitching motion in young pitchers. Sixty-five asymptomatic pitchers were analyzed with a motion capture system. The subjects were classified into two groups according to their age: A: 34cases (10-15 years old), B: 3lcases (19-34 years old). Kinematic and kinetic parameters were used to compare the differences between the two groups. Abduction and horizontal adduction angles of the upper arm were smaller in group A at ball release. The trunk was less flexed and twisted, but was bent much more toward the non-throwing side in the group A. There were no significant differences between the two groups with regard to the elbow angles, the wrist angles and the interval from arm-cocking phase to ball release. Our results showed that the young pitchers tend to put their pitch arm behind their trunk at ball release. That position is not close to “Zero Position”. It causes stretching the anterior structure of the shoulder. Furthermore, the shoulder is overloaded by the rotational stress from the end of armcocking phase to ball release. Repetition of this stress might cause epiphyseal damage for young pitchers. The young pitchers should be taught proper pitching mechanics. Limitation on pitches might be able to reduce the risk of epiphyseal damage in young pitchers.