ACL Recovery Exercises: Rehabilitation After Surgery

ACL reconstruction is just the beginning of a 9-12 month journey back to your sport. The exercises you do during rehabilitation determine whether your new ligament holds up or fails. This comprehensive guide takes you from surgery through return to play.

Understanding ACL Rehabilitation

The New Ligament

Your reconstructed ACL (typically using patellar tendon, hamstring, or quadriceps graft) needs time to heal, strengthen, and integrate with your bone. This process takes months, and rushing it increases re-injury risk.

Timeline Overview

• Weeks 1-2: Reduce swelling, restore extension, activate quads
• Weeks 2-6: Regain range of motion, begin strengthening
• Weeks 6-12: Build strength, begin light jogging
• Months 3-6: Progress strengthening, return to running
• Months 6-9: Sport-specific training, cutting/pivoting
• Months 9-12: Return to sport (with clearance)

Goals by Phase

1. Full knee extension (critical!)
2. Adequate flexion for activities
3. Quadriceps strength (most important muscle)
4. Hamstring and hip strength
5. Balance and proprioception
6. Sport-specific skills

Phase 1: Weeks 0-2

Immediate Goals

• Control swelling
• Achieve full knee extension (straightening)
• Activate quadriceps
• Begin gentle flexion

Swelling Management

• Ice: 20 minutes every 2 hours
• Elevation: Above heart level when resting
• Compression: Ace wrap or compression sleeve
• Ankle pumps: 30 reps every hour to promote circulation

Quad Sets

The most important early exercise:

1. Sit or lie with leg extended
2. Tighten your thigh muscle, pushing your knee down
3. Hold 10 seconds
4. Relax
5. 20-30 reps, 4-5 times daily

You cannot do too many quad sets.

Straight Leg Raise

1. Lie on back, brace opposite knee
2. Do a quad set first
3. Lift leg 8-12 inches, keeping knee straight
4. Lower slowly
5. 3 sets of 10-15, 3 times daily

Prone Hangs (Extension)

Full extension is critical and easier to achieve early:

1. Lie face down with legs hanging off the bed from mid-thigh
2. Let gravity pull your knee straight
3. Stay 10-15 minutes, 3 times daily

Heel Props

1. Place a rolled towel under your ankle (not behind the knee!)
2. Let your knee hang into extension
3. Hold 10-15 minutes, multiple times daily

Gentle Flexion

Heel Slides:

1. Lie on back
2. Slide heel toward buttock
3. Use a strap to assist if needed
4. Only go as far as allowed by your surgeon (often 90 degrees initially)
5. 20-30 reps, 3 times daily

Walking

• Use crutches as prescribed
• Weight bear as allowed by surgeon
• Focus on normal gait pattern
• Keep brace locked in extension if instructed

Phase 2: Weeks 2-6

Goals

• Achieve at least 120 degrees of flexion
• Maintain full extension
• Progress quad strength
• Begin closed-chain exercises

Range of Motion Progressions

Wall Slides:

1. Lie on back, feet on wall
2. Let foot slide down the wall, bending knee
3. Use other foot to push for more flexion
4. Hold 30-60 seconds at end range
5. Repeat 10 times

Stationary Bike:

• Start when you can bend past 90 degrees
• May need to rock back and forth initially
• No resistance at first
• 10-15 minutes

Strengthening

Mini Squats:

1. Stand with support, feet shoulder-width apart
2. Bend knees to 30-45 degrees
3. Keep weight in heels
4. Return to standing
5. 3 sets of 10-15

Step-Ups (Short Step):

1. Use a 4-inch step
2. Step up with surgical leg
3. Step down leading with other leg
4. 2-3 sets of 10

Leg Press (When Cleared):

1. Start light, limited range (0-60 degrees)
2. Full knee extension at the top
3. 3 sets of 12-15

Standing Hip Exercises:

• Hip flexion: 3 × 15
• Hip extension: 3 × 15
• Hip abduction: 3 × 15

Bridges:

1. Lie on back, knees bent
2. Lift hips, squeezing glutes
3. Hold 5 seconds
4. 3 sets of 15

Patella Mobilization

The kneecap can stiffen after surgery:

1. Sit with leg extended
2. Push kneecap up, down, left, right
3. Move gently but firmly
4. 2-3 minutes, 2-3 times daily

Phase 3: Weeks 6-12

Goals

• Full range of motion
• Progress closed-chain strengthening
• Begin single-leg exercises
• Light jogging (around week 12, if cleared)

Strength Progressions

Full Range Squats:

1. Progress depth gradually
2. Ensure good form (knees over toes)
3. 3 sets of 12-15

Lunges:

1. Start with reverse lunges (easier)
2. Progress to forward lunges
3. Control the motion
4. 3 sets of 10 each leg

Step-Ups (Higher):

1. Progress to 6-8 inch step
2. 3 sets of 12

Single-Leg Press:

1. Use leg press machine
2. Single-leg, moderate weight
3. 3 sets of 10-12

Romanian Deadlifts:

1. Hold dumbbells
2. Hip hinge with slight knee bend
3. 3 sets of 12

Hamstring Strengthening

Hamstrings protect the ACL—don't neglect them:

Nordic Curls (Eccentric):

1. Kneel with ankles anchored
2. Slowly lower yourself forward
3. Catch with hands
4. Push back up
5. 3 sets of 5-8

Hamstring Curls:

1. Machine or resistance band
2. 3 sets of 12-15

Single-Leg Balance

Single-Leg Stand:

1. Stand on surgical leg
2. Hold 30-60 seconds
3. Progress to eyes closed
4. Progress to unstable surface

Single-Leg Squat Touch:

1. Stand on surgical leg
2. Reach other leg forward and touch heel to ground
3. Return to standing
4. 3 sets of 10

Phase 4: Months 3-6

Goals

• Build strength to 80%+ of other leg
• Progress to running
• Begin agility ladder/light agility

Running Progression (When Cleared)

Week 1:

• Walk 2 min, jog 1 min × 5
• Every other day

Week 2:

• Walk 1 min, jog 2 min × 5

Week 3:

• Jog 5 min, walk 1 min × 3

Week 4:

• Continuous jog 15-20 minutes

Week 5+:

• Increase duration and intensity gradually

Advanced Strengthening

Bulgarian Split Squats:

1. Rear foot elevated on bench
2. Lower into lunge
3. 3 sets of 10 each leg

Single-Leg Romanian Deadlift:

1. Stand on one leg, hold weight
2. Hip hinge, reaching other leg back
3. 3 sets of 8-10 each leg

Box Jumps (Low):

• Start with step-ups to a box
• Progress to stepping down
• Then small jumps up
• Focus on soft, controlled landings

Leg Press Single-Leg (Heavier):

• Progress weight
• 3-4 sets of 8-10

Phase 5: Months 6-9

Goals

• Achieve 90%+ strength symmetry
• Begin cutting and pivoting drills
• Progress sport-specific training

Agility Progressions

Lateral Shuffles:

1. Athletic stance
2. Shuffle sideways
3. Stay low
4. 2-3 sets of 10 yards each direction

Carioca:

1. Side-stepping with crossover
2. Focus on hip rotation
3. Both directions

Figure-8 Running:

1. Large figure-8s first
2. Progressively smaller
3. Eventually add cones

Cutting Drills:

1. Start with anticipated cuts (you know where you're going)
2. Progress to unanticipated (react to stimulus)
3. Build speed gradually

Plyometrics

Box Drops:

1. Step off low box (6 inches)
2. Land softly on both feet
3. Progress height

Jump and Stick:

1. Jump forward
2. Land and hold 3 seconds
3. Focus on stable landing

Single-Leg Hops:

1. Small hops
2. Progress distance and height
3. Always control the landing

Phase 6: Months 9-12 (Return to Sport)

Criteria for Return

Physical testing (typically required):

• Quad strength 90%+ of other leg
• Hamstring strength 90%+ of other leg
• Single-leg hop tests 90%+ of other leg
• No pain or swelling
• Full range of motion

Functional criteria:

• Completed full running program
• Completed agility and cutting progressions
• Sport-specific drills at full speed
• Psychological readiness (confidence)

Sport-Specific Training

• Practice drills at increasing intensity
• Controlled scrimmages
• Non-contact practice
• Full practice
• Return to competition

Ongoing Prevention

Even after return:

• Continue hamstring strengthening (Nordics)
• Neuromuscular training (balance, landing)
• Hip and core strengthening
• Proper warm-up before activity

Sample Weekly Schedule

Weeks 2-6

Daily:

• Quad sets: 30 reps, 4 times
• Heel slides: 30 reps
• Prone hangs: 15 min, 2-3 times
• Straight leg raises: 3 × 15

3-4 times per week:

• Bike: 15-20 min
• Mini squats: 3 × 12
• Step-ups: 2 × 10
• Bridges: 3 × 15

Weeks 6-12

3-4 times per week:

• Bike: 20-30 min
• Squats: 3 × 15
• Lunges: 3 × 10 each
• Step-ups: 3 × 12
• Leg press: 3 × 12
• Hamstring curls: 3 × 12
• Single-leg balance: 3 × 60 sec

Months 3-6

3-4 times per week:

• Running progression
• Bulgarian split squats: 3 × 10
• Single-leg RDL: 3 × 10
• Nordic curls: 3 × 6
• Single-leg press: 3 × 10
• Box jumps (low): 3 × 8
• Balance on unstable surface

Months 6-9

3-4 times per week:

• Running and agility
• Advanced strength training
• Cutting and pivoting drills
• Plyometrics
• Sport-specific drills

Key Takeaways

1. Extension is #1 priority early—don't let it slip
2. Quad strength is the biggest predictor of success
3. You cannot do too many quad sets in weeks 1-4
4. Progress gradually—rushing increases re-injury risk
5. Hamstrings protect your ACL—prioritize Nordic curls
6. The graft needs time to mature—9-12 months minimum
7. Psychological readiness matters for return to sport
8. Continue prevention exercises even after return

ACL rehabilitation is a marathon, not a sprint. Each phase builds on the last, and skipping steps leads to problems. Trust the process, do the work, and you'll return to your sport stronger and more prepared than before.