For Patients After ACL Reconstruction, Cartilage Restoration (MACI / Osteochondral Allograft), or Meniscus Repair or Transplant
Prepared by: Dr. Robert Duerr, Orthopedic Sports Medicine
Introduction
Knee preservation procedures such as ACL reconstruction, cartilage restoration (MACI or osteochondral allograft), and meniscus transplantation are designed to restore knee stability and protect the joint from early arthritis.
After formal physical therapy ends, long-term exercise is critical to maintain strength, protect the surgical reconstruction, and prevent future injury.
This guide provides safe long-term exercise recommendations for maintaining knee health and returning to an active lifestyle.
Key Principles for Long-Term Knee Health
Successful long-term outcomes depend on maintaining:
- Strong quadriceps muscles
- Strong hip and core muscles
- Good neuromuscular control and balance
- Healthy body weight
- Regular low-impact cardiovascular exercise
Patients who stop exercising after physical therapy often lose 20–30% of quadriceps strength within the first year, which increases the risk of knee pain and future injury.
Weekly Exercise Targets
| Exercise Type | Recommended Frequency |
|---|---|
| Strength training | 2–3 days per week |
| Balance / neuromuscular training | 2–3 days per week |
| Cardiovascular exercise | 3–5 days per week |
| Flexibility / mobility | Daily |
Strength Exercises for All Knee Preservation Patients
These exercises are safe and beneficial for most patients after ACL reconstruction, MACI, osteochondral allograft, or meniscus transplant.
| Exercise | Sets | Reps | Benefit |
|---|---|---|---|
| Goblet squat | 3 | 8–10 | Quadriceps strength |
| Step-ups | 3 | 10 each leg | Functional knee strength |
| Romanian deadlift | 3 | 8 | Posterior chain strength |
| Hamstring curls | 3 | 12 | Protects knee stability |
| Lateral band walks | 3 | 15 | Hip stability |
| Calf raises | 3 | 15 | Lower leg strength |
Balance and Neuromuscular Training
Balance exercises improve knee stability and reduce reinjury risk.
| Exercise | Sets | Reps |
|---|---|---|
| Single-leg balance | 3 | 30 seconds |
| Single-leg squat (shallow) | 3 | 8 |
| Step-downs | 3 | 8 each leg |
| BOSU balance squats | 3 | 10 |
Cardiovascular Exercise
Low-impact cardiovascular activity is recommended for long-term knee health.
Best Options
- Cycling
- Swimming
- Elliptical training
- Rowing
- Walking
Running
Running may be appropriate depending on the procedure and surgeon guidance.
Patients with cartilage restoration procedures should limit repetitive long-distance running.
Special Considerations by Procedure
After ACL Reconstruction
Most patients can gradually return to higher impact activities and sports if strength and stability are restored.
Recommended Activities
- Running
- Strength training
- Agility drills
- Recreational sports
Exercises to Emphasize
| Exercise | Benefit |
|---|---|
| Single-leg squats | Quadriceps symmetry |
| Nordic hamstring curls | Protect ACL graft |
| Lateral band walks | Prevent knee valgus |
| Plyometric drills | Improve landing control |
After Cartilage Restoration (MACI or Osteochondral Allograft)
Cartilage grafts require long-term protection from excessive impact and shear forces.
Recommended Activities
- Cycling
- Swimming
- Elliptical training
- Strength training
- Hiking
Activities to Limit
| Activity | Reason |
|---|---|
| Deep squats (>90° with heavy weight) | Increased cartilage stress |
| High-impact plyometrics | Increased joint compression |
| Frequent cutting sports | Increased shear forces |
| Long-distance running | Repetitive cartilage loading |
After Meniscus Repair or Transplant
The meniscus helps protect the knee from arthritis by absorbing shock.
Patients should emphasize strength and low-impact fitness.
Recommended Activities
- Cycling
- Swimming
- Strength training
- Golf
- Hiking
Activities to Limit
- Deep squatting under heavy load
- Competitive pivoting sports
- High-impact running
Example Weekly Exercise Plan
| Day | Activity |
|---|---|
| Monday | Strength training |
| Tuesday | Cycling or elliptical |
| Wednesday | Balance and mobility |
| Thursday | Strength training |
| Friday | Rest or light cardio |
| Saturday | Recreational activity |
| Sunday | Walking or swimming |
Warning Signs During Exercise
Stop activity and contact your physician if you experience:
- Persistent knee swelling
- Knee instability or giving way
- Sharp joint pain
- Mechanical symptoms such as locking or catching
- Loss of knee motion
Long-Term Outlook
Maintaining strength and fitness after knee preservation surgery can:
- Improve long-term knee function
- Protect cartilage and joint surfaces
- Reduce risk of arthritis
- Allow patients to remain active for many years
Exercise is one of the most important factors in preserving the health of your knee joint.