This review illustrates the MR appearances of commonly encountered problems that can present as a "locked knee", as well as several unusual causes. Internal derangement of menisci, particularly bucket handle tears, predominate. Loose bodies as a result of trauma/degeneration and lesions such as cysts of the cruciate ligaments and focal pigmented villonodular synovitis are also illustrated. While meniscal tears are the major cause of "locked knee" in clinical practice, interference with normal knee kinematics is non-specific with regard to the diagnosis. Emphasis is therefore given to less frequently seen abnormalities that lead to a mechanical block of knee extension.
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Discoid meniscus is a congenital morphological variant of the meniscus, which tends to occur more frequently in its lateral form than in the medial form. This anomaly is characterized by central hypertrophy of the meniscus and a larger diameter than the normal meniscus, resulting in an abnormal shape and greater coverage of the tibial plateau. The clinical presentation of this condition varies depending on the stability of the meniscus.
View Article and Find Full Text PDFSurgical Management of a Torn ACL and Bucket-Handle Meniscal Tear in the Pregnant Patient: A Case Report.
JBJS Case Connect
April 2024
Department of Orthopaedics, Rutgers, Robert Wood Johnson Medical School, New Brunswick, New Jersey.
Case: A 36-year-old, 7-month pregnant woman presented to the office with a locked knee and a displaced bucket-handle medial meniscus tear, in the setting of chronic anterior cruciate ligament (ACL) insufficiency. After thorough discussion with the patient and her husband, the obstetrician, and the anesthesiologist, the patient was treated with left knee ACL reconstruction and medial meniscus repair.
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Article Synopsis
- An acutely locked knee is a serious condition needing immediate orthopedic care, often caused by issues like meniscus tears or ACL injuries.
- This report discusses a unique case where a locked knee was due to both a loose body and a degenerative osteophyte, showcasing the complexity of diagnosis and treatment.
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Department of Anatomy and Surgical Anatomy, Faculty of Health Sciences, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.
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Br J Hosp Med (Lond)
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Department of Trauma and Orthopaedics, St George's University Hospital, London, UK.
The acute locked knee is an orthopaedic emergency requiring prompt diagnosis and treatment. It can be classified as acute or chronic. The term 'locked knee' refers to a knee that demonstrates fixed flexion or which has a 'block' to complete extension.
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