Author: Mark Hinton, MD Educational Pearls:   Meniscus lock can occur with a tear leading to inability to extend the knee Treatment can include an intra-articular joint block followed by straightening Medial meniscus injuries are more common   References: Allum RL, Jones JR. The locked knee. Injury. 1986 Jul;17(4):256-8. PubMed PMID: 3770920. Critchley IJ, Bracey DJ. The acutely locked knee--is a manipulation worth while? Injury. 1985 Jan;16(4):281-3. PubMed PMID: 3967919. Summary by Travis Barlock, MS4  | Edited by Erik Verzemnieks, MD