Which signs indicate a knee injury such as ACL or meniscal tear requires specialist evaluation?

• A. Severe or progressive swelling, instability, catching or locking, and significant limitation of weight-bearing.
• B. Mild swelling that subsides in 24 hours.
• C. Pain only with climbing stairs.
• D. Full, pain-free ROM immediately after injury.

Answer: (A)

Experiencing knee signs that suggest possible ACL or meniscal damage and need specialist evaluation includes severe or progressive swelling, instability, catching or locking, and significant difficulty bearing weight. Severe swelling after a knee injury often indicates bleeding into the joint from ligament or meniscal injury, which points to a serious intra-articular problem. Instability means the supportive ligaments aren’t functioning properly, increasing the risk of further damage. Catching or locking signals a mechanical issue inside the joint, such as a torn meniscus fragment or loose body getting in the way of smooth motion. When weight bearing is notably limited, it reflects a substantial injury that could involve a fracture or major ligament/meniscal damage. Together, these signs warrant professional assessment, imaging if needed, and a treatment plan rather than waiting to see if it improves on its own. In contrast, mild swelling that subsides quickly, pain only with stairs, or full, painless range of motion soon after injury are more consistent with minor injuries and do not as clearly mandate specialist evaluation.