Os hamuli proprium

Case contributed by Dr Brian Gilcrease-Garcia


Acute radius fracture.

Patient Data

Age: 30 years
Gender: Female

Along the volar aspect of the hamate, there is an oval well-corticated bone in the expected location of the hamulus (hook). No evidence of acute carpal fracture.

Annotated image

Red arrow points to well-corticated ossific fragment at the expected location of hamate hook.

Case Discussion

This was an incidental finding during evaluation for acute radial shaft fracture. 

A smooth and well-defined ossified body in the expected location of the hook of the hamate is most consistent with an unfused ossification center, also known as os hamuli proprium. Although a healed fracture of the hook of hamate could have this appearance, the exact alignment and absence of reported prior trauma suggest a congenital etiology.

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Case information

rID: 61747
Published: 17th Jul 2018
Last edited: 14th Aug 2019
Tag: ossicle
Inclusion in quiz mode: Excluded
Institution: Mallinckrodt Institute of Radiology at Washington University

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