MRIによる断裂棘上筋の萎縮性変化の評価 : 非断裂患者の加齢性変化との比較 Quantative Evaluation of Atrophic Changes of the Torn Supraspinatus Muscle using MRI : A Comparative Study with Aging Changes
Our objective was to elucidate the effective factors for atrophic changes of a torn supraspinatus muscle quantatively.<BR>Patients and Methods. We analyzed the data of 100 patients with shoulder pain and examined their MRIs due to shoulder pain; the clinical features and the measured data from the MRI; the severity of the cuff tear, the area of the supraspinatus muscle sectioned oblique sagittally at the articular edge of the glenoid (S). To revise the physique differences, the maximum transverse diameter of the humeral head (D) was also measured. The severity of the cuff tears were divided into 6 grades; no tear (grade 0), partial thickness tear (grade 1), small tear (grade 2), medium tear (grade 3), large tear (grade 4), massive tear (grade 5). A stepwise regression analysis was used for the detection of the effective factors.<BR>Results.1) 67 cases had no-cuff tear and 33 cases had a cuff tear.2) In the no-cuff tear group, the sectioned area of the supraspinatus muscle (S) simply correlated with the maximum transverse diameter of the humeral head (D) no relation with sex or the side, hence the S/D was used as the revised marker of the sectioned area of the supraspinatus muscle. The stepwise regression analysis resulted in S/D=550.9-2.5x(age) in the no-cuff tear group (P<0.01).3) In the cuff tear group, stepwise regression analysis resulted in S/D=705.0-53.3x(cuff tear grade)-4.5x(age) (P<0.01).<BR>Conclusion. Deterioration of the rotator cuff tear may be a more of a causative factor for atrophic changes of the supraspinatus muscle than aging.
- 肩関節 = Shoulder joint
肩関節 = Shoulder joint 23(2), 277-279, 1999-07-30