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Three-dimensional shoulder kinematics normalize after rotator cuff repair
lateral rotation and decreased glenohumeral elevation with arm abduction. We hypothesized that in
patients with an RC tear, scapular lateral rotation, and thus glenohumeral elevation, will be restored to
normal after RC repair.
Methods: Shoulder kinematics were quantitatively analyzed in 26 patients with an electromagnetic tracking
device (Flock of Birds) before and 1 year after RC repair in this observational case series.We focused
on humeral range of motion and scapular kinematics during abduction. The asymptomatic contralateral
shoulder was used as the control. Changes in scapular kinematics were associated with the gain in range
of motion. Shoulder kinematics were analyzed using a linear mixed model.
Results: Mean arm abduction and forward flexion improved after surgery by 20° (95% confidence interval
[CI], 2.7°-36.5°; P =...Show moreBackground: Patients with a rotator cuff (RC) tear often exhibit scapular dyskinesia with increased scapular
lateral rotation and decreased glenohumeral elevation with arm abduction. We hypothesized that in
patients with an RC tear, scapular lateral rotation, and thus glenohumeral elevation, will be restored to
normal after RC repair.
Methods: Shoulder kinematics were quantitatively analyzed in 26 patients with an electromagnetic tracking
device (Flock of Birds) before and 1 year after RC repair in this observational case series.We focused
on humeral range of motion and scapular kinematics during abduction. The asymptomatic contralateral
shoulder was used as the control. Changes in scapular kinematics were associated with the gain in range
of motion. Shoulder kinematics were analyzed using a linear mixed model.
Results: Mean arm abduction and forward flexion improved after surgery by 20° (95% confidence interval
[CI], 2.7°-36.5°; P = .025) and 13° (95% CI, 1.2°-36.5°; P = .044), respectively. Kinematic analyses
showed decreases in mean scapular protraction (ie, internal rotation) and lateral rotation (ie, upward rotation)
during abduction by 3° (95% CI, 0.0°-5.2°; P = .046) and 4° (95% CI, 1.6°-8.4°; P = .042), respectively.
Glenohumeral elevation increased by 5° (95% CI, 0.6°-9.7°; P = .028) at 80°. Humeral range of motion
increased when scapular lateral rotation decreased and posterior tilt increased.
Conclusions: Scapular kinematics normalize after RC repair toward a symmetrical scapular motion pattern
as observed in the asymptomatic contralateral shoulder. The observed changes in scapular kinematics
are associated with an increased overall range of motion and suggest restored function of shoulder
muscles.Show less
- All authors
- Kolk, A.; Witte, P.B. de; Henseler, J.F.; Zwet, E.W. van; Arkel, E.R.A. van; Zwaal, P. van der; Nelissen, R.G.H.H.; Groot, J.H. de
- Date
- 2016-01-21
- Volume
- 25
- Issue
- 6
- Pages
- 881 - 889