Quadriceps Weakness After ACL Reconstruction: How to Rebuild It
- Tom Morgan, Chartered Physiotherapist
- 2 days ago
- 2 min read
Updated: 6 hours ago
Why the quadriceps becomes weak after ACL surgery and how strengthening is progressively rebuilt.
What matters most
Swelling can inhibit quadriceps activation even before major muscle loss occurs.
How to progress
Early activation progresses towards loaded squats, step work and gym resistance when appropriate.
Common mistake to avoid
Objective strength testing is useful later because the operated leg can feel stronger than it actually is.
More structured rehabilitation support
General information only. Your own surgeon and physiotherapist should guide restrictions, exercise selection and progression. Seek urgent medical advice for chest pain, shortness of breath, a hot swollen calf, wound discharge, fever or rapidly worsening symptoms.
Complete rehabilitation programme
If you want the full structured programme rather than piecing recovery information together article by article, View the ACL Reconstruction Rehabilitation Guide (£24.99)
How to use this information in your rehabilitation
ACL rehabilitation should rebuild knee movement, quadriceps and hamstring strength, single-leg control and progressively the demands of running, jumping and sport. Progression is best guided by both healing time and objective function rather than time alone.
What should guide progression?
Look for a gradual improvement in the task you are working on while keeping symptoms and movement quality under control. If a progression causes a large or lasting increase in pain, swelling, loss of movement or poorer function, reduce the load and build up more gradually. Your surgeon or physiotherapist may give you different restrictions based on the exact procedure and your individual recovery.
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