Rotator cuff repair is a patient endurance test. The shoulder has to be left alone for six weeks while the tendon knits back to bone. Then four months of slow, methodical rebuilding. The patients who do well are the ones who accept that early, not the ones who try to push through.
What was actually repaired
The rotator cuff is a group of four tendons that wrap around the head of your humerus and hold it centred in the shoulder socket. The supraspinatus, on the top, is the one that tears most often. When it tears, the tendon pulls away from the bone. The surgeon reattaches the tendon to its footprint on the humerus using suture anchors.
The repair is strong on the day of surgery. The tendon-to-bone interface is not. Biology has to do the rest. That biology takes 6 to 12 weeks to produce a connection that can take any load. If you load it before then, you re-tear it.
Re-tear rates and what affects them
Re-tear rates for rotator cuff repairs range from 10 percent for small tears in younger patients to 40 percent or more for large tears in older patients. The biggest predictors are tear size, age, tissue quality, and how strictly the early restrictions are followed. The first one you can't change. The last one you can.
What the timeline looks like
- Week 0 to 6: Sling. Day and night except for hygiene and the exercises your surgeon allows. Passive range of motion only, no active movement of the operated arm. Hand, wrist and elbow exercises to keep them mobile. Pendulum swings.
- Week 6 to 12: Sling off. Active assisted range of motion progressing to active. Stretching to regain full passive range. Still no resistance training of the cuff.
- Month 3 to 4: Light resistance with bands. Scapular control work. Postural training. The cuff is loaded gently for the first time.
- Month 4 to 6: Strength building. Dumbbells, cable work, push and pull patterns. Most desk workers back to full duties.
- Month 6 to 9: Heavy strength training. Most overhead athletes start a return-to-sport progression here. Tradies often need this long before returning to full duties.
- Month 9 to 12: Full return to sport or full work duties. The shoulder is usually 90 to 95 percent of pre-surgery strength.
The sling is non-negotiable
Patients underestimate how often they use their dominant arm until they can't. Reaching for a coffee, pulling up a sock, opening the car door. Each one of those small loads stresses the repair. The sling is what stops you doing them reflexively.
Wear it for the full duration your surgeon specified. Six weeks for most repairs, longer for large or revision repairs. Sleeping in a sling is awkward. Most patients find a recliner or stacked pillows on the back to keep the shoulder neutral works best.
The two most common reasons rotator cuff repairs fail are reaching for something with the operated arm before week six, and trying to lift weights before month four. Both feel fine in the moment. Both are visible on the scan three months later.
What patients get wrong
First, ditching the sling at week four because the pain is gone. The pain dropping doesn't mean the tendon is healed. The biology takes six weeks regardless of how you feel. Second, skipping the passive range work in weeks two to six. The stiffness that comes from doing nothing is real. Get the range back early and gently. Third, treating the operated arm as "the broken one" forever. Once you're cleared to load it, load it. Avoiding it builds a long-term weakness that's harder to undo than a re-tear.
What we do at Rehab N Run
We typically see rotator cuff repair patients weekly through the sling phase, twice a week from week six to twelve, then weekly again through month four. Hands-on work to keep the joint capsule and surrounding muscles mobile in the sling phase. Progressive loading from month three onwards. Book a 60-minute initial in the first two weeks after surgery and bring your surgical report so we can see exactly what was repaired.