The road to recovery: ACL rehabilitation

After ACL reconstruction, rehabilitation is critical to restore knee function and reduce the risk of reinjury. This process is phase-based and typically lasts 9 to 12 months before an athlete can safely return to competitive sport. Each phase builds on the previous one, with clear goals and milestones.

Early phase: 0 to 6 weeks post-surgery

The early phase focuses on controlling pain and swelling, restoring full range of motion, and reactivating the quadriceps. Key milestones include achieving 0 to 135 degrees of knee motion, performing unassisted straight-leg raises, and returning to normal walking mechanics. 

Intermediate phase: 6 to 12 weeks post-surgery

This phase emphasizes progressive strengthening of the quadriceps, hamstrings, glutes, and core. Balance and proprioceptive training are also introduced to retrain the knee’s ability to respond to changes in position and load. Key exercises that start are step-ups, Romanian deadlifts, squats, and balance exercises. 

Intermediate phase: 3 to 6 weeks post-surgery

The advanced phase, 3 to 6 months, introduces plyometrics, running progressions, change-of-direction drills, and landing mechanics. These exercises focus on neuromuscular awareness, teaching the athlete to handle dynamic, high-stress movements safely. Continue to strengthen muscles in both legs and progressively increase the difficulty of exercises.  

Final Stage:6-12 months post-surgery

Finally, the return-to-sport phase, usually 6 to 9 months or longer, focuses on sport-specific training while maintaining leg strength symmetry. Fatigue management, resistance training, and psychological readiness are also addressed. Objective testing, rather than time alone, guides return-to-play decisions. Tests like isokinetic strength assessment, single-leg hop tests, and Y-Balance testing identify strength asymmetries or deficits that must be corrected before full competition. Research shows that delaying return to sport after six months can reduce reinjury risk by nearly 50%.

Protocols 

There are several physical therapy protocols designed to support a successful return to sport. While certain aspects may vary depending on the type of graft used, the key milestones remain largely consistent across all protocols. It is essential to work closely with your surgeon, physical therapist, and athletic trainers to ensure the plan is appropriate for you and that your progression occurs at a safe and effective pace.

Mass General Brigham Protocol

We offer a range of specialized services tailored to meet your individual needs. Our approach is focused on understanding and responding to what you require, providing effective and practical solutions.

Delaware Physical Therapy Clinic

We offer a range of specialized services tailored to meet your individual needs. Our approach is focused on understanding and responding to what you require, providing effective and practical solutions.

Additional Information

New technologies and rehabilitation protocols are being developed to enhance the recovery process, improve outcomes, and reduce the risk of reinjury after ACL surgery.

Blood Flow Restriction Technology

Blood flow restriction (BFR) training is often used during ACL injury rehabilitation to help maintain muscle strength and size while using lighter loads, reducing stress on the healing joint. By partially restricting blood flow during exercise, BFR promotes muscle growth and recovery, making it a valuable tool in the early and mid-stages of rehab.

Force Plate Technology

Force plate technology is used during ACL rehabilitation to objectively measure how much force an athlete can produce, helping clinicians assess strength and readiness to progress. By analyzing metrics such as ground reaction forces and limb asymmetries, it provides precise data to guide training decisions and track recovery over time.