ACL Surgery Recovery: Week-by-Week Exercises, Timeline and What to Avoid

Recovery after ACL reconstruction takes about 9–12 months for pivoting sports. You move through five phases, and you progress to the next one when you meet clear goals – not just when time passes. Getting your knee fully straight early, rebuilding quadriceps strength, and waiting until you pass return-to-sport tests are the three things that matter most.

This guide from the knee team at Sports Orthopedics Institute, Bengaluru, walks you through each phase: what to aim for, which exercises to do, what to avoid, and how to know you're ready to move on. Always follow your own surgeon's and physiotherapist's protocol, which may differ if you had extra procedures such as a meniscus repair.

Jump to a phase

• Phase 1: Weeks 0 to 2
• Phase 2: Weeks 2 to 6
• Phase 3: Weeks 6 to 12
• Phase 4: Months 3 to 6
• Phase 5: Months 6 to 12
• Exercises to avoid
• Is my recovery on track?

Your recovery at a glance

Phase	Timing	Main goals	Key milestone to move on
1. Protect and straighten	Weeks 0–2	Control swelling, full straightening, wake up the quadriceps	Full extension; straight-leg raise without a lag
2. Walk normally	Weeks 2–6	Bend to 120°, normal walking, basic strength	Walking without a limp; little swelling
3. Build strength	Weeks 6–12	Full movement, strength and balance	Good single-leg squat; balance 30–60 seconds
4. Run and jump	Months 3–6	Running, hopping, power	Quadriceps about 80% of the other side before running
5. Return to sport	Months 6–12	Cutting, agility, sport training	At least 9 months; strength and hop tests about 90% of the other side

Phase 1: Weeks 0 to 2

Protect the knee, control swelling, and get it fully straight.

Goals

• Full knee extension (straight) – the single most important early goal
• Bend to about 90°
• Switch the quadriceps back on
• Walk with crutches, increasing weight as advised

Exercises

Exercise	How	Dose
Ankle pumps	Point and pull your foot up and down	10 every hour while awake
Quadriceps sets	Leg straight; tighten the thigh to push the back of the knee down; hold 5–10 seconds	3 × 10, 3–4 times a day
Heel prop	Rolled towel under the heel (never under the knee); let the knee straighten	10–15 minutes, 3–4 times a day
Heel slides	Slide heel towards your bottom, using a towel to help	3 × 10, 2–3 times a day
Straight-leg raise	Tighten the thigh first, then lift the straight leg about 30 cm	3 × 10, twice a day

Avoid

• A pillow under the knee – it makes the knee stiffen in a bent position
• Long periods on your feet; keep the leg raised when resting
• Walking without crutches until your physiotherapist clears you

Ready to move on when

Your knee straightens fully, you can do a straight-leg raise without the knee sagging, swelling is settling, and you can walk with crutches comfortably. Most people are off crutches by about 2 weeks.

Phase 2: Weeks 2 to 6

Walk normally again and build basic strength.

Goals

• Bend to about 120° by week 4
• Keep the knee fully straight
• Walk without a limp or crutches
• Reduce swelling

Exercises

Exercise	How	Dose
Stationary bike	Start once you can bend about 100°; minimal resistance	10 minutes, building to 20–30
Mini squats	Feet hip-width; bend only 30–45°; knees over toes	3 × 10–15
Low step-ups	10–15 cm step; step up with the operated leg, slowly	2–3 × 10
Standing hamstring curls	Holding a chair, bend the knee to bring the heel up	3 × 12
Side-lying leg lifts	Lift the top leg, toes forward	3 × 15 each side
Calf raises	Both feet, holding support	3 × 15

Avoid

• Deep squats or lunges
• Running, jumping or twisting
• Heavy leg-extension machine work (see Exercises to avoid)

Ready to move on when

You walk normally without a limp, your knee is fully straight, it bends to about 120°, and swelling is minimal after daily activity.

Phase 3: Weeks 6 to 12

Build strength, balance and control. Your knee will feel much better – but the graft is still maturing, so don't rush.

Goals

• Full bending, equal to the other knee
• Single-leg balance for 30–60 seconds
• Steady gains in thigh and hip strength

Exercises

Exercise	How	Dose
Leg press	Both legs, then single leg; bend to 90°	3 × 10–12
Wall sits	Back to the wall, knees bent 60–90°	3–5 holds of 20–30 seconds
Single-leg balance	Progress from floor to cushion, then eyes closed	3 × 30–60 seconds
Step-downs	Slowly lower the other foot from a 15–20 cm step	3 × 10
Band side-steps	Band around knees; small steps sideways in a half squat	3 × 10–15 each way
Romanian deadlifts	Both legs, light weight, hinging at the hips	3 × 10
Bike, cross-trainer, swimming (no breaststroke kick)	For fitness	20–30 minutes

Avoid

• Running, jumping and pivoting sport
• Breaststroke kick and deep loaded squats

Ready to move on when

Your knee has full movement with no swelling, you can do a controlled single-leg squat with the knee staying over the toes, and your physiotherapist confirms good quadriceps strength.

Phase 4: Months 3 to 6

Start running, then hopping and jumping, while continuing to build strength.

Before you start running, you should have

• Full movement and no swelling
• A good-quality single-leg squat
• Controlled landings on both legs
• Quadriceps strength about 80% of the other side
• Clearance from your physiotherapist

Exercises

Exercise	How	Dose
Walk–jog intervals	Flat surface; e.g. 1 minute jog, 1 minute walk	Build gradually over weeks
Forward and reverse lunges	Controlled, knee over toes	3 × 8–10 each leg
Single-leg leg press and step-downs	Increasing load	3 × 8–12
Double-leg hops	Soft, quiet landings, knees over toes	3 × 10, then progress
Single-leg hops	Only once double-leg landings are good	As advised
Agility ladder	Forward, then sideways patterns	5–10 minutes

Avoid

• Full-speed cutting, pivoting and competitive sport
• Plyometrics with poor landing control

Ready to move on when

You can run comfortably without swelling, hop with good control on the operated leg, and your strength is approaching that of the other side.

Phase 5: Months 6 to 12

Rebuild cutting, agility and sport skills, then return to sport once you pass objective tests.

Training

• Change-of-direction drills, starting with gentle 45° cuts at half speed and building up
• Deceleration and landing practice
• Sport-specific drills – for example, fielding and bowling run-ups in cricket, court movement in badminton, dribbling and controlled tackling in football
• Gradual return to team training before matches
• Continue strength work 2–3 times a week

Return-to-sport checklist

• At least 9 months since surgery for pivoting and contact sports
• Quadriceps and hamstring strength about 90% of the other side
• Hop tests about 90% of the other side
• Full movement, no swelling
• Confident in the knee, with no fear of giving way
• Clearance from your surgeon and physiotherapist

Why waiting and testing matter

In the Delaware–Oslo cohort study, the re-injury rate fell by about half for each month that return to sport was delayed, up to 9 months after surgery. Patients who returned without passing return-to-sport tests had a re-injury rate of 38%, compared with 5.6% in those who passed, and more equal quadriceps strength reduced re-injury (BJSM, 2016).

Exercises to Avoid and When They Become Safe

Most “forbidden” exercises are only off-limits for a while. The timing below is typical; your physiotherapist may adjust it.

Activity	Avoid until about	Why
Walking without crutches	Cleared, usually 1–2 weeks	Needs full straightening and quadriceps control first
Pillow under the knee	Never use it	Encourages a permanently bent knee
Deep squats and lunges under load	8–12 weeks	High stress on the knee early on
Resisted leg extensions (open chain)	Around 4–12 weeks, starting in a limited range under supervision	Can strain the graft if introduced too early or in the wrong range
Running	3–4 months, and only when criteria are met	Impact before strength is ready
Jumping and plyometrics	4–6 months, progressed gradually	Landing forces
Cutting, pivoting, twisting	6–9 months, progressed gradually	The movements that tear ACLs
Contact and competitive pivoting sport	At least 9 months, after passing tests	Re-injury risk falls sharply up to 9 months

Leg extensions are not banned. Carefully introduced, limited-range leg extensions are used by many physiotherapists to rebuild quadriceps strength – the key is the right range and load at the right time.

Is My Recovery on Track?

Use this after each exercise session or step up in training.

	What you notice	What to do
Green – keep going	Mild muscle soreness gone within 24 hours; no extra swelling; walking normally	Continue as planned
Amber – ease off	Soreness lasting more than 24 hours; mild swelling that settles overnight	Repeat the previous level for a few days
Red – stop and check	Sharp pain; swelling that builds or doesn't settle; limping; losing movement; knee giving way	Stop progressing and contact your physiotherapist

Call your surgeon urgently if you have

• Fever, increasing redness or warmth, or discharge from a wound
• Calf pain, swelling or tenderness – possible blood clot
• Chest pain or breathlessness – seek emergency care
• Severe pain not controlled by your medicines

Book a review if

• Your knee isn't fully straight by about 2 weeks
• You can't bend to about 90° by 2 weeks or 120° by 4–6 weeks
• Swelling persists beyond 6 weeks
• The knee feels unstable, catches or locks

Special Situations

Your programme may be adjusted for your graft, extra procedures and personal factors.

Situation	What may change
Patellar tendon graft	More front-of-knee pain at first; kneeling may stay uncomfortable; extra kneecap mobility work
Hamstring graft	Gentler hamstring loading in the early weeks; occasional hamstring cramps
Quadriceps tendon graft	Slower return of quadriceps control; extra focus on straight-leg raises
Meniscus repair at the same time	Weight-bearing and bending often limited for several weeks; deep squats delayed longer
Cartilage repair at the same time	Longer protected weight-bearing and a later return to impact
Teenagers and young adults	Higher re-injury risk; strict criteria-based return is especially important
Adults over 40	Goals often focus on daily function and recreational sport; arthritis may coexist
Female athletes	Extra emphasis on hip strength and landing technique to avoid the knee caving inwards

Mind, Nutrition and Braces

Your mind

Frustration, low mood and fear of re-injury are common and can slow your return. Set small weekly goals, celebrate milestones, stay connected with your team or training group, and talk to your physiotherapist if fear is holding you back. Graded exposure to harder movements in a controlled setting rebuilds confidence.

Nutrition

Eat enough protein at each meal – dal, rajma, chickpeas, paneer, curd, milk, eggs, chicken or fish – to limit muscle loss while you are less active. Include plenty of fruit and vegetables, keep alcohol to a minimum in the early weeks, and get your vitamin D level checked if you haven't recently. Supplements are not a substitute for rehab.

Braces

A post-operative brace is used by some surgeons for comfort and protection in the first weeks. Research has not shown long-term benefits for knee stability or function. A sports brace on return to play may help confidence, but it is no substitute for strength and good movement.

Helpful extras

Electrical muscle stimulation can help switch the quadriceps on in the early weeks. Blood-flow restriction training, under supervision, can build strength with lighter loads.

Frequently Asked Questions

How long is recovery after ACL surgery?

Most people walk normally by 4–6 weeks, run by 3–5 months, and return to pivoting sport at 9–12 months once they pass return-to-sport tests.

When can I walk without crutches?

Usually within about 2 weeks, once your knee is fully straight and you can control your quadriceps – sooner or later depending on your surgeon's protocol and any extra procedures.

When can I drive?

After left knee surgery in an automatic car, once you're off strong painkillers and comfortable. After right knee surgery, usually around 2–6 weeks, once you can brake firmly and safely. Check with your surgeon.

When can I start running?

Typically 3–5 months after surgery, once you have full movement, no swelling, good single-leg control and about 80% quadriceps strength.

When can I return to cricket, football, badminton or kabaddi?

For pivoting and contact sports, at least 9 months after surgery, and only after passing strength and hop tests at about 90% of the other leg.

Can I do leg extensions?

Yes, but in a limited range and with light load at first, under your physiotherapist's guidance. Closed-chain exercises such as squats and leg press form the core of early rehab.

Can my ACL tear again?

Yes. The risk is highest in young people returning to pivoting sports, especially before 9 months or without passing return-to-sport tests. Ongoing strength and prevention training reduces it.

Do I need to wear a brace?

Only if your surgeon recommends one. Braces have not been shown to improve long-term results.

How Sports Orthopedics Institute Can Help

Our knee team in HSR Layout, Bengaluru provides ACL reconstruction with integrated, criteria-based rehabilitation and formal return-to-sport testing. Book a consultation for a personalised recovery plan.

References

• Grindem H, et al. Simple decision rules can reduce reinjury risk by 84% after ACL reconstruction: the Delaware-Oslo ACL cohort study. British Journal of Sports Medicine, 2016.

Disclaimer: This guide is for general information. Always follow the specific protocol from your own surgeon and physiotherapist.