抄録
The manage ment of the deltoid in a rotator cuff repair is still controversial. The purpose of this study was to analyse the functional recovery of the deltoid by using surface EMG.43 shoulders of 43 patients with a rotator cuff repair were examined before and 2 months after surgery. There were 32 males and 11 females, ranging in age from 33 to 78 years(mean: 59.02 years). Surface EMGs were measured in the deltoid(anterior, middle and posterior fiber). Each muscle activity was recorded under the maximum isometric contraction for five seconds. A computer system managed the described data and calculated the integrated EMG. All the subjects underwent an acromioplasty and they were then divided into two groups according to the management of the deltoid, group A consisted of 29 patients with a nondetached the deltoid, group B consisted of 14 patients with a detached deltoid. In the reattachment of the deltoid, the muscle fiber was jerked up to the acromion in order to give the muscle a favorable tension.
All three fibers showed excellent recovery after surgery compared with before. The percentage of recovery rate(after surgery/before surgery%)indicated 140.11% in the anterior fiber,152.71% in the middle fiber,124.92% in the posterior fiber.
There was no statistical difference between group A and group B (p<0.05)in the percentage of recovery rate of the detachment of the deltoid.
In a cuff repair, a lot of factors such as age, sex, size of cuff tear and morbidiy period influence the surgical results. However, the recovery of the detached deltoid had the same reasonable results as the recovery of a non-detached deltoid on condition that the muscle fiber was tense.
