Knee giving out inwards

Patient: I was in the ocean and was taken under by a wave. My knee felt like it ben inwards.Now whn i talk it gives out but it feels like it bends in when it gives out. What could be the problem

Doctor: A muscle sprain involves the tearing or stretching of the ligaments beyond their normal capacity. A muscle strain is ass ociated with the tearing or excessive stretching of the muscle and can be equally as painful. Symptoms of muscle injury and muscle pain obviously involve pain, however it is not uncommon for the affected area to swell, redden and become bruised or discolored. All symptoms of muscle injury and muscle pain can range from mild to severe. Any muscle strain or muscle pull or even a muscle tear implies damage to a muscle or its attaching tendons. The time of healing varies from patient to patient and also depends on the severity of the injury. The conservative treatment consists of: initially, protection, rest, ice, compression, and elevation (known as the PRICE formula) can help the affected muscle and also maintaining the strained muscle in a stretched position. Heat can be applied when the swelling has lessened, anti-inflammatory drugs (i.e.: “Aleve”), rest the strained muscle and avoid the activities that caused the strain and other activities that are painful. A Physical Therapy program for 4-6 weeks must be followed and practice at home the stretching exercises above all. The healing time and conditions for each patient are different. If after this timeframe your knee is not improving significantly, other conditions must be ruled out as menisci injury or more severe ligament lesion, so you will have to get an appointment with an orthopedic surgeon for evaluation.