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Post-Surgery

How to recover faster after knee surgery

Recovery after knee surgery is not just about rest. The right rehabilitation programme, started early, makes the biggest difference to your outcome.

7 min readMay 2025

Whether you have had an ACL reconstruction, a knee replacement, or a meniscus repair, the quality of your rehabilitation determines how well your knee works in the long run. Surgery corrects the structural problem. Physiotherapy rebuilds the strength, range of motion, and confidence to use it properly. Starting rehabilitation early, even within the first day or two, consistently produces better outcomes than waiting for all the pain and swelling to settle first.

The three phases of recovery

  • Phase 1: Protection and early movement (days 1 to 14): Focus is on reducing swelling, regaining basic range of motion, and activating the quadriceps. Weight-bearing is usually allowed with crutches from day 1 or 2, depending on the procedure.
  • Phase 2: Strengthening (weeks 3 to 8): Swelling settles and the focus shifts to rebuilding strength in the quadriceps, hamstrings, and calf muscles. Balance and coordination exercises are introduced progressively.
  • Phase 3: Functional return (weeks 8 onwards): Higher-level activities, including stairs, squats, walking on uneven ground, and then sport-specific drills, are progressively added. For ACL patients, return to sport is typically not before 9 months.

Early exercises (weeks 1 to 2)

Ex

Quad sets

Objective: Reactivates the quadriceps, which often switch off after knee surgery due to pain and swelling.

  1. 1Lie flat or sit with your leg straight out in front of you.
  2. 2Press the back of your knee down towards the floor or bed by tightening the muscle at the front of your thigh.
  3. 3Hold the contraction for 5 to 10 seconds.
  4. 4Release fully and relax.
Prescription: 10 to 15 repetitions every hour while awake. This is safe to do even with significant swelling.
Ex

Heel slides

Objective: Gradually restores knee flexion (bending) in a controlled way.

  1. 1Lie on your back.
  2. 2Slowly slide your heel towards your buttocks, bending your knee as much as you comfortably can.
  3. 3Hold at the end of your range for 2 seconds.
  4. 4Slide the heel back to the start.
  5. 5Use a smooth surface or a plastic bag under your heel to reduce friction.
Prescription: 10 to 15 repetitions, 3 to 4 times a day. Track how far your heel can slide each day. Gradual improvement is expected.

Mid-phase exercises (weeks 3 to 8)

Ex

Straight leg raise

Objective: Builds quad strength without stressing the healing knee joint.

  1. 1Lie on your back with the operated leg straight and the other knee bent for support.
  2. 2Tighten the quad of the straight leg (quad set).
  3. 3Lift the leg to the height of the bent knee.
  4. 4Hold for 2 seconds, then lower slowly.
  5. 5Do not let the knee bend during the lift.
Prescription: 3 sets of 10 to 15, once daily. Add a small ankle weight when this feels easy.
Ex

Mini squats

Objective: Reintroduces weight-bearing through the knee in a controlled, partial range.

  1. 1Stand at a bench or kitchen counter for balance.
  2. 2Feet hip-width apart, toes slightly turned out.
  3. 3Bend your knees to about 30 to 40 degrees, not a full squat.
  4. 4Keep your weight evenly through both feet.
  5. 5Hold 2 seconds at the bottom, then straighten back up.
Prescription: 3 sets of 10, every other day. Pain should stay at or below 3 out of 10. Stop if you feel sharp pain inside the knee.

Red flags to watch for

  • Increased swelling: Some swelling is normal. If your knee suddenly becomes much more swollen after an exercise session, rest and apply a cold pack, not directly on skin. If swelling does not reduce within 24 hours, contact your surgeon.
  • Redness and heat: A warm, red knee that feels hot to touch may indicate infection. Contact your surgeon immediately rather than waiting.
  • Complete loss of muscle control: If your quad completely fails and your knee buckles when walking, stop and contact your physiotherapist before continuing exercises.
  • Fever: Fever after surgery is always worth checking with your doctor. It should not be assumed to be a normal part of recovery.

A physiotherapist at home is often the most practical option after knee surgery, especially in the first two weeks when clinic travel is difficult. Book a home visit on BookPhysio.in.

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