Electromyographic Evaluation of Early-Stage Shoulder Rehabilitation Exercises Following Rotator Cuff Repair.
Peter K Edwards, Patrick Wai Hang Kwong, Timothy Ackland and 3 others
PMID 34909253WHAT IT FOUND
Most early shoulder exercises exceeded safe loading limits in healthy volunteers.
Only the pendulum, table slide, and assisted wall slide kept supraspinatus activation low. Clinicians should not assume passive exercises are safer than active-assisted ones for protecting the cuff.
Key findings
01In healthy participants, most passive and active-assisted exercises generated supraspinatus muscle activity above the 15% threshold suggested for safe early post-operative loading.
02The pendulum, table slide, and assisted wall slide were the only exercises evaluated that kept supraspinatus activation below 15%.
03There was no clear difference in muscle activation between passive and active-assisted exercises for the supraspinatus, suggesting the distinction may not be necessary for protecting the tendon.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study was performed on healthy, young volunteers, not patients with repaired rotator cuffs. Muscle activation patterns in a painful, post-surgical shoulder may differ significantly. EMG measures muscle electrical activity, not the actual mechanical tension or stress placed on the healing tendon repair. Many participants were healthcare professionals (physiotherapists or exercise physiologists), which may have led to more correct exercise technique than typical patients would exhibit at home. The 15% MVIC threshold for 'safe' loading is based on previous literature and expert consensus, not a universally agreed-upon biomechanical limit.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not apply these findings directly to post-surgical patients. The study measured healthy shoulders, so the muscle activation levels reported may not reflect the altered movement patterns or pain inhibition seen in patients recovering from rotator cuff repair.