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Proximal ulnar osteochondroma as a potential risk factor for radial head dislocation: A retrospective analysis
Han Xiao1,2,3,4, Miao Li1,2,3, Xiaoqian Tan1,2,3
1The Affiliated Children's Hospital of Xiangya School of Medicine, Central South University (Hunan Children's Hospital), Changsha, China.
Journal of Children'S Orthopaedics
|June 22, 2026
Summary
Hereditary multiple osteochondromas (HMO) in the proximal ulna can lead to radial head dislocation. Surgical removal of these ulnar tumors may prevent dislocation in patients with this rare forearm condition.
Area of Science:
- Orthopedics
- Medical Genetics
- Radiology
Background:
- Hereditary multiple osteochondromas (HMO) is a rare genetic disorder.
- HMO affecting the proximal radius and ulna is exceptionally uncommon.
- Limited clinical literature exists on this specific presentation.
Purpose of the Study:
- To describe a rare case of HMO involving the proximal forearm.
- To discuss potential management strategies for this condition.
- To identify risk factors for radial head dislocation in HMO patients.
Main Methods:
- Retrospective review of patients with HMO (2010-2021).
- Radiographic assessment of osteochondromas, radial head status, ulnar bow, and ulnar length.
- Statistical comparison using Brown-Forsythe and Welch test with Tamhane's T2 post hoc analysis.
Main Results:
- 12 patients (14 forearms) with HMO were analyzed.
- Patients with proximal ulnar tumors without resection developed radial head subluxation/dislocation.
- No subluxation/dislocation occurred in patients with radius-limited proximal tumors.
- No significant differences in ulnar length or bow were observed between groups.
Conclusions:
- Proximal lateral ulnar osteochondromas are a risk factor for radial head dislocation.
- Surgical excision of proximal ulnar tumors may prevent radial head dislocation.
- Early intervention is crucial for managing HMO-related forearm deformities.
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