Mucoid degeneration of the anterior cruciate ligament |
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Authors: | Robrecht Motmans Frank Verheyden |
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Institution: | (1) Department of Orthopaedic Surgery, Heilig Hart Ziekenhuis Lier, Katholieke Universiteit Leuven, Leuven, Belgium;(2) Grevensmolenweg 70, 3800 Sint-Truiden, Belgium |
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Abstract: | Mucoid degeneration of the anterior cruciate ligament (ACL) is a rare cause of knee pain. We report a case of a patient with
mucoid degeneration of the ACL, presenting with posterior knee pain and no history of a major knee trauma. On clinical examination,
the active range of motion showed a flexion deficit. The posterior knee pain was induced by passive hyperflexion of the knee.
There was no evidence of ligamentary instability. MRI showed a diffuse thickening of the ACL with a nodular mass on the femoral
insertion occupying the intercondylar notch, with increased signal intensity on both T1- and T2-weighted images. Arthroscopic
evaluation showed a diffuse hypertrophy of the ACL, throughout the entire length of the posterolateral bundle (PLB). A yellowish
homogenous mass on the femoral insertion of the ACL impinged on the posterior cruciate ligament (PCL) in flexion and occupied
the entire intercondylar notch. We performed an arthroscopic debridement of the hypertrophied tissues as precisely as possible.
This resulted in a nearly complete removal of the PLB and immediate relief of symptoms. Examination of knee stability after
debridement showed a stable ACL. Arthroscopic debridement of the mucoid degeneration of the ACL proved to be a safe and effective
method, without causing ligamentary instability in daily activities. |
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Keywords: | ACL Arthroscopy MRI Mucoid degeneration Knee joint |
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