Shoulder Muscle Strength and Neuromuscular Activation 2 Years after Reverse Shoulder Prosthesis—An Experimental Case Control Study
Abstract
:1. Introduction
2. Materials and Methods
2.1. Subjects
2.2. Range of Motion and Clinical Outcome Scores
2.3. Radiographic Evaluation
2.4. Assessment of Muscle Strength
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- for abduction and adduction: starting position at 30° of abduction, neutral elbow position, neutral hand position, handle parallel to the chair;
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- for flexion and extension: starting position at 30° of abduction, neutral elbow position, hand in 30° pronation;
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- for internal and external rotation: starting position at 90° of abduction, elbow at 90° of flexion, hand in neutral position.
2.5. Assessment of EMG Activity
2.6. Statistics
3. Results
4. Discussion
5. Conclusions
Author Contributions
Conflicts of Interest
References
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Variable | Mean ± SD (range) | |
---|---|---|
N | 13 (7 women) | |
Age (yrs) | 73 ± 12 (48–87) | |
Body mass index (kg/m2) | 28 ± 4 (18–35) | |
Postoperative follow-up (months) | 24 ± 1 (23–26) | |
Operated side | 11 right (8 dominant) | |
Clinical outcome scores | Pre-operative | Post-operative |
Constant score (0–100) | 39 ± 11 (21–59) | 76 ± 9 (50–84) * |
QuickDASH score (0–100) | 48 ± 17 (29–90) | 82 ± 16 (50–97) * |
Active range of motion | Operated side | Non-operated side |
Abduction (°) | 130 ± 18 (100–160) | 160 ± 11 (140–170) * |
Flexion (°) | 140 ± 7 (120–145) | 170 ± 11 (150–180) * |
Internal rotation (°) | 30 ± 13 (20–60) | 50 ± 7 (40–60) * |
External rotation (°) | 60 ± 13 (40–80) | 80 ± 10 (60–90) * |
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Rienmüller, A.; Maffiuletti, N.A.; Schwyzer, H.-K.; Eggspühler, A. Shoulder Muscle Strength and Neuromuscular Activation 2 Years after Reverse Shoulder Prosthesis—An Experimental Case Control Study. J. Clin. Med. 2020, 9, 365. https://doi.org/10.3390/jcm9020365
Rienmüller A, Maffiuletti NA, Schwyzer H-K, Eggspühler A. Shoulder Muscle Strength and Neuromuscular Activation 2 Years after Reverse Shoulder Prosthesis—An Experimental Case Control Study. Journal of Clinical Medicine. 2020; 9(2):365. https://doi.org/10.3390/jcm9020365
Chicago/Turabian StyleRienmüller, Anna, Nicola A. Maffiuletti, Hans-Kaspar Schwyzer, and Andreas Eggspühler. 2020. "Shoulder Muscle Strength and Neuromuscular Activation 2 Years after Reverse Shoulder Prosthesis—An Experimental Case Control Study" Journal of Clinical Medicine 9, no. 2: 365. https://doi.org/10.3390/jcm9020365