Details changed or left out to protect the athlete’s privacy.
Where she started
She’s a boxer. She came to me about 4 months after ACL surgery, from a high-volume clinic where she wasn’t getting one-on-one time. She’d been doing rehab for months and still couldn’t do a single-leg squat. She could barely load her quad without it shaking.
Her quad was small, weak and slow to fire. After knee surgery your body shuts the quad down. The muscle is there, but you can’t fully switch it on. That’s not a strength problem you can push through. You have to switch the quad back on first. Why the quad stays weak after ACL surgery →
What was missing
The quad needs to be loaded early. Leg extensions start almost right away with no weight, then holds with light load in a small, safe range, then a bigger range, working all the way to a straight knee. She wasn’t getting that. Her rehab didn’t fail because she didn’t work hard.
What we did
- Started over from zero. First, an even squat pattern, side to side.
- Switched the quad back on. Electrical stimulation pads to help the quad contract harder, plus leg extensions and holds, building load and range step by step.
- Tested, not guessed. We tested her quad strength against her other leg and against her body weight before moving on.
- Running, then bouncing. Once she was cleared to run, we built her back up to being quick and reactive on her feet: landing and bouncing back up, speeding up and stopping.
What she had to pass
Return to sport is criteria-based, not timeline-based. Before she went back to boxing, she had to pass:
- Quad strength compared with her other leg.
- Quad strength for her body weight.
- Speeding up and slowing down.
- How quickly she can land and bounce back up.
- Confidence in the knee.
What we test before return to sport →
Back into the ring: control to chaos
First, contact in drills where she knew exactly what was coming. Then things she didn’t see coming. We added the thinking piece: speed up on blue, stop on green, call out whether a number is even or odd while she moves. Control the environment, then open it up.
Then sparring, step by step: just her punches, then open sparring in a controlled setting, then back to full sparring and competing.
Where she is now
She’s back to her sport and competitive. No swelling, no pain, and she’s not feeling held back.
Stuck after ACL surgery?
If you’re months out and still can’t do a single-leg squat, or your quad shakes when you load it, the plan needs to change. Every athlete’s surgery and progress is different, so it starts with testing to find out where you are. ACL rehab in Miami →
This article is for general education and isn’t a substitute for an individual evaluation. Results depend on the athlete, the surgery and how they respond to training.