title: Ultrasonographic findings in cubital tunnel syndrome caused by a cubitus varus deformity.
abstract: We have retrospectively reviewed the clinical, preoperative ultrasonographic, and operative findings of eight patients who had tardy ulnar nerve palsy caused by a cubitus varus deformity. The mean varus angle on the affected side was 23°. With preoperative ultrasonography, the anterior dislocation of the ulnar nerve from the medial epicondyle was detected in dynamic scanning of short-axis images, and long-axis images revealed nerve compression and kinking in the proximal border of the flexor carpi ulnaris. Operative findings revealed compression of the ulnar nerve by a fibrous band, which was released in all cases. The cause of the tardy ulnar nerve palsy in this series of patients was constriction by a fibrous band and kinking in the proximal border of the flexor carpi ulnaris due to ulnar nerve dislocation from compression resulting from the forward movement of the medial head of the triceps brachii muscle.
authors.affiliation: Department of Orthopaedic Surgery, St. Marianna University School of Medicine, Kawasaki 211-8511, Japan. h3simizu@marianna-u.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Shimizu
authors.forename: M
authors.initials: M
authors.lastname: Beppu
authors.forename: T
authors.initials: T
authors.lastname: Arai
authors.forename: H
authors.initials: H
authors.lastname: Kihara
authors.forename: K
authors.initials: K
authors.lastname: Izumiyama
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D020430:Cubital Tunnel Syndrome / Q000000981:diagnostic imaging* / Q000209:etiology / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016916:Joint Deformities, Acquired / Q000150:complications / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D010027:Osteotomy / Q000379:methods*; D012189:Retrospective Studies; D013639:Tarsal Bones / Q000000981:diagnostic imaging* / Q000601:surgery; D014463:Ultrasonography; D055815:Young Adult