Anterior Cruciate Ligament (ACL) Recovery: Return to Sport Protocol

Returning to sport after ACL reconstruction is a milestone that requires careful preparation. Premature return is the leading cause of ACL re-injury. This guide outlines the strength benchmarks, functional tests, and criteria you must meet before returning to sport safely.

Strength Benchmarks

Before returning to sport, your surgical leg must achieve at least 90% strength symmetry compared to your non-surgical leg. This is measured through isokinetic testing of the quadriceps and hamstrings. The hamstring-to-quadriceps strength ratio should also be balanced for optimal knee stability.

Functional Testing

Functional tests assess your readiness for sport-specific demands. Common tests include: single-leg hop for distance, triple hop for distance, crossover hop, 6-metre timed hop, and single-leg vertical jump. You should achieve at least 90% limb symmetry index (LSI) on all hop tests.

Neuromuscular Training

Before returning to sport, you must complete a neuromuscular training programme that includes: landing mechanics training, cutting and pivoting drills, deceleration training, perturbation training, and sport-specific agility drills. Proper movement patterns significantly reduce re-injury risk.

Return-to-Sport Decision

The decision to return to sport should be based on objective criteria, not time alone. You must: have full range of motion, no knee effusion (swelling), 90%+ strength symmetry, pass all hop tests, demonstrate proper landing mechanics, and complete sport-specific training without pain or giving way. Most athletes meet these criteria between 9-12 months.