Which of the following is not an objective criterion for clearing an athlete to return-to-play after ACL injury?

• A. Patient-reported knee confidence
• B. Full ROM
• C. Symmetrical strength (≥85-90%)
• D. Absence of effusion

Answer: (A)

The key idea is that return-to-play decisions rely on objective, measurable indicators of knee function and healing rather than how the athlete feels about it. Full range of motion is something you can quantify with a goniometer to ensure the knee can move through a normal arc without restrictions. Symmetrical strength, typically aiming for at least 85–90% recovery of the injured leg compared with the uninjured side, is verified through isokinetic or functional strength testing, showing the muscle’s actual capacity rather than perceived ability. Absence of effusion is a concrete sign that swelling has resolved and the joint is returning to a calmer, more stable state.

Patient-reported knee confidence, while important for how the athlete approaches sport and adheres to rehab, is subjective. Confidence can be influenced by fear, motivation, or expectations and doesn’t necessarily reflect the mechanical readiness of the knee. An athlete might feel confident even when ROM, strength, or swelling hasn’t fully recovered, or vice versa. Therefore, it’s not an objective criterion for clearance.