Knee Replacement Exercises: Recovery Guide for After Surgery

A total knee replacement is a major surgery—but it's also the beginning of getting your life back from knee pain. The exercises you do after surgery determine how well your new knee will function. This guide walks you through rehabilitation from day one to full recovery.

Understanding Your Recovery

Timeline Overview

• Week 1-2: Focus on reducing swelling, regaining basic movement
• Week 2-6: Build range of motion and early strength
• Week 6-12: Progressive strengthening and function
• Month 3-6: Return to most activities
• Month 6-12: Full recovery and optimization

Goals of Rehabilitation

1. Regain full knee extension (straightening)
2. Achieve functional knee flexion (bending—typically 110-120 degrees)
3. Restore muscle strength
4. Return to normal walking pattern
5. Resume desired activities

What to Expect

• Some pain and swelling is normal
• Progress isn't always linear
• Range of motion is often easier to regain than strength
• Full recovery takes 6-12 months

Phase 1: Days 1-14 (Immediate Post-Op)

Start exercises in the hospital and continue at home. These exercises are done multiple times daily.

Ankle Pumps

Prevents blood clots and reduces swelling:

1. Pump your ankles up and down (point and flex)
2. 20-30 repetitions
3. Every hour while awake

Quad Sets

Reactivates the quadriceps muscle:

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

This is one of the most important exercises early on.

Straight Leg Raise (Assisted Then Independent)

1. Lie on your back
2. Tighten quad (as in quad set)
3. Lift entire leg 6-12 inches off bed
4. Keep knee straight
5. Hold 5 seconds
6. Lower slowly
7. 10 repetitions, 3 times daily

Initially, you may need to use your hands or a strap to help lift the leg.

Heel Slides

Regains knee flexion:

1. Lie on your back
2. Slide your heel toward your buttock, bending your knee
3. Use a strap or towel to assist if needed
4. Hold the bent position 5-10 seconds
5. Slide back out
6. 10-20 repetitions, 3-4 times daily

Knee Extension Stretch

Critical for regaining full extension:

1. Sit with leg extended on a bed or couch
2. Place a rolled towel under your ankle (not under your knee)
3. Let gravity push your knee down toward the surface
4. Hold 10-15 minutes
5. Repeat 3-4 times daily

Full extension is easier to achieve early—don't neglect this exercise.

Seated Knee Flexion

1. Sit on edge of chair
2. Slide foot back under the chair
3. Use your other foot on top to push further
4. Hold 20-30 seconds
5. 10 repetitions, multiple times daily

Walking

• Use walker or crutches as prescribed
• Weight bear as allowed by your surgeon
• Short, frequent walks (every 1-2 hours)
• Focus on quality of gait, not distance

Ice and Elevation

Not exercises, but critical:

• Ice 20 minutes, several times daily
• Elevate leg when resting
• Manage swelling aggressively—it limits range of motion

Phase 2: Weeks 2-6 (Range of Motion and Early Strengthening)

Continue Phase 1 exercises and add these progressions.

Prone Knee Flexion (Prone Hangs)

For knee extension:

1. Lie face down with legs off the end of the bed from mid-thigh
2. Let gravity pull your knee into extension
3. Hold 5-10 minutes
4. Can add light ankle weight for more stretch

Stationary Bike (When Cleared)

Usually started around week 2-3:

1. Start with no resistance
2. May need to rock back and forth initially before full rotations
3. 10-15 minutes
4. Progress to full rotations and light resistance

Standing Knee Flexion

1. Stand holding a support
2. Bend your knee, bringing heel toward buttock
3. Hold 5-10 seconds
4. Lower slowly
5. 3 sets of 10

Mini Squats

1. Stand with support
2. Feet shoulder-width apart
3. Bend knees to 30-45 degrees
4. Keep weight in heels
5. Return to standing
6. 2-3 sets of 10

Step-Ups (Low Step)

1. Stand facing a 4-inch step
2. Step up with surgical leg
3. Bring other leg up
4. Step down with non-surgical leg first
5. 2 sets of 10

Seated Knee Extension with Weight

1. Sit on chair with ankle weight
2. Straighten knee
3. Hold 5 seconds at top
4. Lower slowly
5. 3 sets of 10-15

Terminal Knee Extension

Targets the last degrees of extension:

1. Place a rolled towel under your knee
2. Straighten your knee, lifting your heel
3. Hold 5 seconds
4. Lower slowly
5. 3 sets of 15

Side-Lying Hip Abduction

Strengthens hip (critical for normal walking):

1. Lie on non-surgical side
2. Lift surgical leg toward ceiling
3. Lower with control
4. 2-3 sets of 15

Standing Hip Extension

1. Stand holding support
2. Extend surgical leg backward
3. Squeeze glute at the end
4. 2 sets of 15

Phase 3: Weeks 6-12 (Progressive Strengthening)

Build strength and function. Continue key exercises from earlier phases.

Squats (Deeper)

1. Progress to 60-90 degree knee bend
2. Ensure good form (knees tracking over toes)
3. 3 sets of 10-15

Lunges (Modified)

1. Take a step forward with surgical leg
2. Lower into a small lunge
3. Keep front knee behind toes
4. Push back to start
5. 2-3 sets of 10

Step-Ups (Higher Step)

Progress to 6-8 inch step:

1. Focus on pushing through the surgical leg
2. 3 sets of 10

Leg Press (Machine)

When available:

1. Start with light weight
2. Full range of motion
3. 3 sets of 10-15

Single-Leg Balance

1. Stand on surgical leg
2. Hold 30 seconds
3. Progress to 60 seconds
4. Add unstable surface (pillow) when ready

Walking Program

• Transition from walker to cane to no device
• Gradually increase distance
• Focus on normal gait pattern
• Avoid limping

Pool Exercises (When Incision is Healed)

• Walking in water
• Water aerobics
• Gentle kicking
• Range of motion exercises

Phase 4: Months 3-6 (Return to Activity)

Advanced Strengthening

Single-Leg Squat to Chair:

1. Stand in front of chair on surgical leg
2. Slowly lower to seated
3. Stand back up using one leg
4. 2-3 sets of 8-10

Romanian Deadlift:

1. Stand on surgical leg
2. Hip hinge, reaching opposite leg back
3. 2 sets of 10 each leg

Lateral Step-Ups:

1. Stand beside a step
2. Step up sideways with surgical leg
3. Step down with control
4. 3 sets of 10

Cardiovascular Training

• Continue bike (increase resistance and duration)
• Elliptical machine
• Swimming (when cleared)
• Walking on varied terrain

Sport-Specific Training

When cleared by your surgeon (typically 3-6 months):

• Golf: Start with putting, progress to full swing
• Cycling: Outdoor cycling
• Swimming: All strokes
• Tennis: Doubles first, then singles (if approved)

High-impact activities (running, jumping) are generally not recommended after knee replacement.

Sample Weekly Schedule

Weeks 1-2

3-4 times daily:

• Ankle pumps: 30 reps
• Quad sets: 20 reps
• Heel slides: 20 reps
• Straight leg raises: 10 reps
• Knee extension stretch: 10-15 minutes

Walking: Every 1-2 hours, short distances

Ice: After exercises and frequently throughout day

Weeks 2-6

Daily:

• All Phase 1 exercises
• Stationary bike: 15-20 minutes
• Standing knee flexion: 3 × 10
• Mini squats: 2 × 10
• Step-ups: 2 × 10

3 times per week:

• Seated knee extension with weight: 3 × 15
• Hip abduction: 2 × 15
• Hip extension: 2 × 15

Weeks 6-12

3-4 times per week:

• Bike: 20-30 minutes
• Squats: 3 × 12
• Lunges: 2 × 10
• Step-ups: 3 × 10
• Leg press: 3 × 12
• Single-leg balance: 3 × 30 seconds

Daily:

• Walking: 20-30 minutes
• Range of motion maintenance

Months 3-6

3-4 times per week:

• Full strength training routine
• Cardiovascular exercise: 30-45 minutes
• Balance and proprioception work

Red Flags

Contact your surgeon immediately if:

• Increasing redness around incision
• Fever over 101°F
• Drainage from incision
• Sudden severe swelling or pain
• Calf pain, warmth, or swelling (could indicate blood clot)
• Knee gives way or feels unstable
• Unable to bear weight when you should be able to

Tips for Success

Managing Pain

• Take pain medication as prescribed (especially before exercise)
• Ice after exercise sessions
• Stay ahead of pain—don't wait until it's severe

Range of Motion

• Extension is most important—prioritize it
• Work on flexion persistently
• Consistent stretching beats aggressive stretching

Building Strength

• Don't skip exercises—muscle atrophy happens fast
• Progress gradually—increase weight/reps slowly
• Both legs need work—don't neglect the other side

Mindset

• Recovery takes time—be patient
• Celebrate small victories
• Stick with the program even when progress feels slow

Key Takeaways

1. Start exercises immediately—day one matters
2. Extension is critical—easier to achieve early
3. Quad activation is your top priority initially
4. Multiple short sessions work better than one long session
5. Manage swelling aggressively—it limits everything
6. Follow your surgeon's guidelines for weight bearing and activity
7. Full recovery takes 6-12 months—be patient

Your new knee can give you decades of pain-free movement. The work you put into rehabilitation determines how well it will function. Stay consistent with your exercises, communicate with your healthcare team, and trust the process.