Phase 1: Acute Recovery & Protection
Milestones
- Control pain and swelling (RICE protocol).
- Achieve full knee extension (straightening).
- Gradually increase knee flexion to 90 degrees.
- Walk with crutches, usually weight-bearing as tolerated.
Physio Interventions
- →Patellar mobilizations to prevent scar tissue.
- →Quad sets and straight leg raises to reactivate the quadriceps.
- →Cryotherapy and gentle passive range of motion.
Warning Signs
- Inability to achieve full knee extension (can lead to long-term limping).
- Excessive heat, redness, or calf pain (potential DVT).
- Infection signs at the surgical incision site.
Psychological Insight"It is normal to feel vulnerable and frustrated by the sudden lack of mobility. Stick strictly to the protocol—do not rush this phase."
Phase 2: Strength & Neuromuscular Control
Milestones
- Wean off crutches and achieve a normal walking gait.
- Attain full knee flexion (120-135 degrees).
- Perform unassisted squats and step-ups without pain.
Physio Interventions
- →Closed kinetic chain exercises (e.g., leg presses, mini-squats).
- →Stationary cycling for range of motion and light cardio.
- →Proprioception and balance training on unstable surfaces (BOSU ball).
Warning Signs
- Knee swelling increasing after exercise (a sign of pushing too hard).
- Pain specifically at the graft donor site (e.g., patellar tendon or hamstring).
- Limping persisting beyond week 4.
Psychological Insight"Patients often feel 'normal' during daily activities, leading to a false sense of security. It is crucial to remember the ACL graft is actually at its weakest biologically during weeks 6-8."
Phase 3: Running, Agility & Plyometrics
Milestones
- Begin a structured return-to-running program.
- Perform double-leg jumps and bounding without pain.
- Quadriceps strength reaching 75-80% of the uninjured leg.
Physio Interventions
- →Jogging on a treadmill or soft track.
- →Agility ladder drills and basic change-of-direction movements.
- →Introduction of light plyometrics (jumping and landing mechanics).
Warning Signs
- Knee buckling or feelings of instability during jumping.
- Poor landing mechanics (e.g., knee caving inwards/valgus collapse).
- Anterior knee pain during deceleration.
Psychological Insight"Excitement builds as you return to more athletic movements. However, fear of re-injury (kinesiophobia) is common when attempting jumps for the first time."
Phase 4: Return to Sport (RTS)
Milestones
- Pass formal Return-to-Sport (RTS) testing (Hop tests, Isokinetic strength).
- Limb symmetry index >90%.
- Clearance from the orthopedic surgeon for unrestricted sports.
Physio Interventions
- →Sport-specific drills (cutting, pivoting, sprinting).
- →Unanticipated reaction drills to simulate game scenarios.
- →Advanced heavy resistance training.
Warning Signs
- Hesitation or guarding the knee during sport-specific movements.
- Fatigue leading to poor biomechanics late in a training session.
Psychological Insight"Building confidence to trust the knee in competitive environments is the final hurdle. Sports psychology strategies can be beneficial here."
Free Initial Assessment
Includes clinical check, analysis, and personal recovery planning for ACL under Dr. Karolin Rockson, PT (BPT), Ex. CMC - Vellore.