Depending on the type of injury you suffered, you may have torn one of the ligaments or a piece of cartilage within the knee. Given the specific details of your particular knee complaints, you may have torn a piece of meniscus, which is the cartilage that lines the bone in the knee and usually provides a nice smooth surface to protect against one bone from rubbing on another. When a piece of cartilage is torn it can jut outwards into the joint space, and it can occasionally get stuck between the bones when the knee is moved. When this happens, the knee often "locks up" or "catches" and full range of motion is impeded.
To help better determine what is wrong with your knee, you should see your primary care physician
or an orthopedic surgeon
. Evaluation with an MRI is the best way to visualize the structures within the knee to figure out if you did tear some cartilage. In some cases, small tears can be managed conservatively, particularly if they don't cause symptoms. However, in your case, if a tear is diagnosed, you would likely require arthroscopic surgery
to correct the problem given your level of activity and the degree of your symptoms.