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Posterior Shoulder Instability in the Patients with Bilateral Congenital Absence of Long Head of Biceps Tendon: A Case Report
Clinics in Shoulder and Elbow 2018;21:240-245
Published online December 1, 2018
© 2018 Korean Shoulder and Elbow Society.

Sung-Hyun Yoon, Kang Heo, Jae-Sung Yoo, Sung-Joon Kim, Joong-Bae Seo

Department of Orthopedic Surgery, Dankook University College of Medicine, Cheonan, Korea
Correspondence to: Joong-Bae Seo
Department of Orthopedic Surgery, Dankook University College of Medicine, 119 Dandae-ro, Dongnam-gu, Cheonan 31116, Korea
Tel: +82-41-550-3060, Fax: +82-41-556-3238, E-mail: ssjb1990@dkuh.co.kr, ORCID: https://orcid.org/0000-0003-0334-1049
IRB approval: Dankook University Hospital (No. DKUH 2018-05-012).
Received June 6, 2018; Revised July 25, 2018; Accepted July 30, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Rare cases of a congenital absence of the long head of the biceps tendon (LHBT) have been reported, and its incidence is unknown. In a literature review of the congenital absence of the LHBT, only 1 case was associated with posterior shoulder instability and severe posterior glenoid dysplasia. This paper reports the first case of a patient with a bilateral congenital absence of the LHBT with posterior shoulder instability without glenoid dysplasia or posterior glenoid tilt. The patient experienced a traffic accident while holding the gear stick with his right hand. After the accident, a posteroinferior labral tear with paralabral cysts was detected on the magnetic resonance images. The congenital absence of the LHBT was assumed to have affected the posterior instability that possibly increased the susceptibility to a subsequent traumatic posterior inferior labral tear. This case was identified as a posterior inferior tear caused by a traumatic 쁤ear stick injury.
Keywords : Shoulder; Instability; Biceps