[Snapping pes syndrome with a loose bone fragment is a rare cause for medial knee pains]
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Updated: May 29, 2026

Clinical Effects of Ultrasound-Guided Acupotomy in Knee Osteoarthritis Treatment
Published on: April 26, 2024
Roland Knudsen1, Zaid Al-Aubaidi
1Ortopædkirurgisk Afdeling, Odense Universitetshospital, 5000 Odense, Denmark. rolandknudsen@hotmail.com
Abstract:
A case of a patient with snapping pes syndrome following a blunt trauma to the knee is presented. Snapping pes syndrome is a painful catching experienced at the posteromedial corner of the knee from pes anserinus when moving from flexion to extension. Since the accident ten years ago the patient experienced a painful snapping phenomenon on the inner side of the knee. MRI and arthroscopies found no explanation. Ultrasound revealed that the semitendinosus snapped over a bony fragment during extension of the knee. Removal of the fragment resulted in remission.
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