title: Snapping knee caused by intra-articular tumors.
abstract: Locking of the knee can present with no history of antecedent injury. We identified impingement of intra-articular tumors in 2 cases. Intra-articular tumors are relatively rare. Mechanical symptoms were present in both cases. On physical examination, there was a palpable mass at the medial region of the patellofemoral joint. The interior had been replaced mainly by amorphous necrotic tissue. The definite diagnosis of a soft-tissue mass of the knee could not be made on histologic examination.
authors.affiliation: Department of Orthopaedic Surgery, Yamaguchi University School of Medicine, Yamaguchi, Japan. tmine@po.cc.yamaguchi-u.ac.jp
authors.forename: Takatomo
authors.initials: T
authors.lastname: Mine
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ihara
authors.forename: Tosihiko
authors.initials: T
authors.lastname: Taguchi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tanaka
authors.forename: Hidenori
authors.initials: H
authors.lastname: Suzuki
authors.forename: Takahiro
authors.initials: T
authors.lastname: Hashimoto
authors.forename: Shinya
authors.initials: S
authors.lastname: Kawai
mesh_terms: D000273:Adipose Tissue / Q000473:pathology* / Q000601:surgery; D000328:Adult; D018771:Arthralgia / Q000209:etiology; D001182:Arthroscopy; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000150:complications / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D007718:Knee Injuries / Q000150:complications; D007719:Knee Joint / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D009336:Necrosis; D013585:Synovitis / Q000150:complications / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery