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J Wrist Surg
DOI: 10.1055/a-2772-2419
Case Report

Congenital Bilateral Bipartite Trapezoid: A Case Report and Literature Review

Authors

  • Jiangchao Zhang

    1   Department of Hand Surgery, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China

  • Binzhi Zhao

    1   Department of Hand Surgery, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China

  • Yuan Zheng

    1   Department of Hand Surgery, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China

  • Deshui Yu

    1   Department of Hand Surgery, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China

  • Ge Xiong 

    1   Department of Hand Surgery, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China

Funding Information This work was supported by Natural Science Foundation of Beijing Municipality (grant number: 7222087).
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Abstract

Background

Congenital bilateral bipartite trapezoid is an extremely rare anomaly of the carpal bones.

Case Description

We present a case of a 32-year-old man with bilateral bipartite trapezoid. Pronated oblique radiograph demonstrated division of the trapezoid into palmar and dorsal segments. Computed tomography and magnetic resonance imaging confirmed bilateral symmetry of the bipartite trapezoid without degenerative changes or bone marrow edema.

Literature Review

Owing to its rarity, literature on this condition remains limited. Only three articles were identified, including one cadaveric study and two case reports. Our study provides detailed imaging data and offers additional insight into this uncommon entity.

Clinical Relevance

This case highlights the diagnostic value of multiplanar wrist radiographs in detecting subtle carpal lesions. Clinicians should accurately recognize this condition and carefully differentiate it from an isolated trapezoid fracture or fracture nonunion to avoid unnecessary treatment.

Keywords

anatomical variation - congenital - bipartite trapezoid - imaging - diagnosis

Ethical Approval

Our institution does not require ethical approval for reporting individual cases or case series.


Informed Consent

Informed consent was obtained from the subject described in this report.


Note

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008 (5).




Publication History

Received: 28 August 2025

Accepted: 12 December 2025

Article published online:
31 December 2025

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