ACL Rehabilitation Exercise Guide
Anterior Cruciate Ligament Protocol: Phase-Based Dos and Don'ts
Clinical Objective
Successful ACL rehabilitation focuses on early restoration of full passive knee extension, quadriceps reactivation, gentle neuromuscular control, and later progression to multi-planar stability and dynamic strength. Graft protection is paramount in the early phases.
Recommended Exercises
Prone Hangs (Extension Passive Stretch)
WatchHow: Lie face down on a treatment table or bed with your feet and lower shanks hanging off the edge freely. Relax completely for 3–5 minutes.
Purpose: Restores and maintains full terminal knee extension (hyperextension symmetry), which is critical early on.
Demo curated by Physiotutors
Quad Sets with Biofeedback / Towel Roll
WatchHow: Sit or lie with your leg straight. Place a small rolled towel under your heel or knee. Tighten your thigh muscle hard, pushing the back of your knee downward into the surface. Hold for 5–10 seconds.
Purpose: Combats post-operative arthrogenic muscle inhibition and re-educates the quadriceps.
Demo curated by Physiotutors
Heel Slides (Active-Assisted Flexion)
WatchHow: Sit or lie on your back with legs straight. Use a strap or your hands to gently pull your heel toward your buttocks, sliding it along the floor or surface, then slowly return.
Purpose: Progressively restores pain-free knee flexion range of motion.
Demo curated by Physiotutors
Mini-Squats & Weight Shifts (Closed Chain)
WatchHow: Stand holding onto a secure support or TRX straps. Perform controlled bodyweight mini-squats up to 30–45 degrees of knee flexion, maintaining balanced weight distribution.
Purpose: Safely loads the lower extremity in a closed kinetic chain to build early functional quadriceps and gluteal strength.
Demo curated by Physiotutors
Proprioceptive Single-Leg Stances
WatchHow: Once cleared for partial-to-full weight-bearing, stand on the affected leg on a stable floor surface (progressing later to balance pads), keeping posture upright and knee slightly soft.
Purpose: Restores joint position sense, neuromuscular coordination, and dynamic ankle-knee-hip stability.
Demo curated by Physiotutors
Movements & Habits to Avoid
Early Open-Chain Knee Extensions (Heavy Terminal Arc)
Risk: Heavy resisted open-chain extension machine exercises between 0 and 45 degrees place direct, unmitigated anterior shear force on the newly healing ACL graft.
Unrestricted Twisting, Pivoting, or Cutting
Risk: Sudden rotational forces or lateral cutting maneuvers before adequate multi-planar graft maturation can cause structural graft failure or re-injury.
Hyperextension Overload / Forced Stretching
Risk: While passive extension is vital, aggressive or forced hyperextension under heavy load can strain the posterior structures and graft fixation sites.
Unprotected High-Impact Plyometrics & Running
Risk: Jumping, deep landing mechanics, and sprinting too early in the timeline bypass critical strength benchmarks and risk severe joint trauma.
Deep Unrestricted Squats / Lunges in Early Phases
Risk: Deep knee flexion angles combined with forward translation under load increase patellofemoral and tibiofemoral joint stress prematurely.
Clinical GuidelineACL progression must be criteria-based rather than time-based. Always coordinate progression milestones with your orthopedic surgeon and physical therapist.
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