上腕骨大結節, 小結節の骨棘の発生頻度

抄録

This study elucidated the factors causing spur formation at the greater tuberosity and lesser tubercle of the humerus.
260 shoulder joints of 138 preserved skeletons were investigated. The average age at the time of death was 58.7 years (range, 20-86 years).
Presence of spur in the acromion and in the tuberosities of the humerus were observed macroscopically. The angle formed by the tangent line of the front of the condyles and that of the bicipital groove was also measured.
The incidence of spur formation was statistically higher with increasing age. There was a statistical relationship between presence of spur at the humerus and also at the acromion.
According to Neer, elevation of the arm in the anatomical position of external rotation causes the critical area to pass under the anterior process of the acromion. However, this study revealed that the presence of more spurs in the tuberosities makes the humerus statistically internally rotated. Therefore, it may be suggested that the incidence of bony spurs is not only due to impingement, but rotation of the humerus and other factors are also responsible.