title: Calcific tendinitis of biceps femoris: an unusual site and cause for lateral knee pain.
abstract: A 37-year-old man presented to the acute knee and sports medicine clinic with atraumatic lateral knee pain. He had point tenderness over the lateral aspect of his knee which had not settled with anti-inflammatory medications. Imaging revealed a large opaque lesion lateral to the knee and although there was no clear mechanism, injury to the posterolateral corner was considered. An MRI subsequently revealed a rare case of calcific tendinitis to the biceps femoris tendon insertion. This condition was self-limiting and did not require interventions such as steroid injections. This is the first reported case of calcific tendinitis of biceps femoris as a cause of acute knee pain.
authors.affiliation: Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, Norfolk, UK.
authors.forename: Warwick
authors.initials: W
authors.lastname: Chan
authors.affiliation: Department of Trauma and Orthopaedics, Norfolk and Norwich University Hospital, Norwich, Norfolk, UK.
authors.forename: Helen Emily
authors.identifier: http://orcid.org/0000-0002-1545-692X
authors.initials: HE
authors.lastname: Chase
authors.affiliation: Radiology Department, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, Norfolk, UK.
authors.forename: John G
authors.initials: JG
authors.lastname: Cahir
authors.affiliation: Department of Trauma and Orthopaedics, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, Norfolk, UK.
authors.forename: Neil Patrick
authors.initials: NP
authors.lastname: Walton
mesh_terms: D000328:Adult; D018771:Arthralgia / Q000209:etiology*; D002114:Calcinosis / Q000150:complications* / Q000473:pathology; D000070633:Hamstring Muscles; D006801:Humans; D007719:Knee Joint; D008297:Male; D052256:Tendinopathy / Q000150:complications* / Q000473:pathology