I felt a pop on the outside of my knee playing football. What happened?

What may have been injured

The outer side of the knee is held by the lateral collateral ligament (LCL) and a group of structures called the posterolateral corner, which control the knee bending outward and twisting backwards. They are typically injured when the knee is pushed outward, for example by a tackle to the inside of the knee, or when it is forced straight beyond its normal range.

An isolated mild LCL sprain causes tenderness on the outer side and usually recovers with rest and rehabilitation. More serious injuries combine damage to several structures and may include the ACL or PCL. The lateral meniscus can also tear in the same moment.

Look out for these

• The knee feels wobbly or bends outward when you stand or walk
• You cannot walk without limping, or the knee buckles when straight
• Quick swelling within hours
• Numbness on the outer shin or top of the foot, or difficulty lifting the foot, which can mean the peroneal nerve was stretched
• Severe pain, a knee that looks out of shape or a cold, pale foot, which need the emergency department now

First steps at home

Stop playing. Use ice, compression and elevation for the first two days, and crutches if walking is painful or the knee feels unstable. Avoid twisting and do not test the knee by returning to the pitch. Simple painkillers can help if they are safe for you.

Why early review in Doha matters

Posterolateral corner injuries are easily missed, and some do better when repaired or reconstructed within the first few weeks than later. If the knee feels unstable, swells or the pain is not settling after a few days, arrange to see a knee surgeon promptly. Dr. Gelber at Aman Hospital examines all the ligaments, the nerve and the meniscus, and usually requests an MRI to map the injury before deciding between bracing and surgery.