What Are the First Signs of an ACL Tear?

An ACL tear commonly presents after a sudden pivot, landing, stop, or change of direction. The knee may swell soon after the injury because bleeding or irritation occurs inside the joint. Pain can make walking difficult, while instability may appear when turning or putting weight through the leg. These features can also occur with other knee injuries, so symptoms alone cannot confirm the diagnosis. An examination and, when needed, imaging help assess the ligament and check for associated cartilage or meniscus injury.

Stop sport and avoid twisting, jumping, or testing the knee repeatedly. Rest with the leg supported, use a cold pack wrapped in cloth for short periods, and follow a clinician's advice about pain relief. If walking is painful or the knee feels unstable, use support and arrange an assessment. Rehabilitation may be recommended before returning to activity; a clinician can also discuss Sports Physiotherapy and a Return-to-Sport Programme.

Arrange prompt medical assessment for marked swelling, difficulty bearing weight, repeated giving way, or limited ability to bend or straighten the knee. Seek urgent care after a major injury if the knee looks deformed, the foot becomes cold or numb, or severe pain is not settling. Early assessment of a possible ACL Tear can guide protection of the joint and the next treatment decision.

Ask whether the examination suggests ACL injury, whether imaging is needed, and which movements should be avoided. You can also ask how long to use support, when rehabilitation should begin, and whether ACL Reconstruction is appropriate for your activity goals.