<prompt> A patient gives a H0 twisting strain and locking of the knee joint, the most likely diagnosis is -Avulsion of tibial tubercleMeniscal tearTearing of lateral collateral ligamentTear of anterior cruciate ligament  <response>: Clinical features of meniscal tearThe patient is usually a young patient who sustained a twisting injury to the knee on the sports field.There is a classical history of twisting injury with swelling appears some hours later or perhaps the following day in comparison to hemarthrosis, in which swelling develops immediately.There is recurrent pain. Later on, pain becomes persistent.There is recurrent locking of the knee, i.e., the knee is locked in partial flexion with the inability to extend the knee for the last few degrees. 