Which objective criteria are commonly used to clear an athlete for return-to-play after an ACL or knee injury?

• A. Full ROM, symmetrical strength (≥85-90%), successful functional tests (e.g., hop tests), absence of effusion, and medical clearance
• B. Full ROM and absence of effusion
• C. Full ROM, same strength, but no functional tests
• D. ROM alone is sufficient for clearance

Answer: (B)

Clearance hinges on getting the knee back to a functional baseline that implies safe loading. Full range of motion shows the joint can move through its normal arc without stiffness or blocks, which is essential for any sport movement. Absence of effusion indicates the joint swelling has resolved, suggesting the tissues aren’t actively irritated and the knee can tolerate loading again. Together, these observable, objective signs confirm the knee has recovered enough to begin more challenging steps like strength work and functional tests. While many protocols later add strength symmetry and hop or movement tests to guide full return to play, full ROM and absence of swelling are the common, foundational criteria that must be present before progression.