If there was a complete dislocation of the knee, then most likely you had bicruciate injury or injury to anterior and posterior cruciate ligaments. If there was a partial dislocation, one of the cruciate ligament may be still functioning. Its difficult to say unless an examination or investigational study is done. If your knee is symptomatic, then you should first regain your range of motion through physical therapy, strengthen your muscles and then have ligament reconstruction done - that is the best scenario of restoring the normal anatomy. However any associated injuries like tear in the meniscus or articular cartilage surface will definitely influence the outcome the natural history of a dislocated knee (without any intervention) is early onset of arthritis or instability.