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Radiocapitellar and Ulnotrochlear Pressures Increase in a Radial Head Fracture Model: A Cadaveric Biomechanical
Thomas France1, Winthrop Lockwood1, Songyuan Gu2
1Department of Orthopedics, University of Colorado, Aurora, Colorado.
The Journal of Bone and Joint Surgery. American Volume
|December 26, 2023
Summary
Radial head resection significantly increases intra-articular elbow joint pressure. Even partial resection elevates radiocapitellar and ulnotrochlear pressures, impacting joint health and fracture management strategies.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Anatomy
Background:
- Intra-articular pressure changes related to radial head fracture management are not well-documented.
- Radial head fractures are common elbow injuries requiring effective treatment strategies.
Purpose of the Study:
- To investigate the impact of progressive radial head resection on intra-articular pressure in the radiocapitellar and ulnotrochlear joints.
- To hypothesize that increased radial head resection leads to elevated joint pressures.
Main Methods:
- Utilized ten cadaveric elbow specimens.
- Measured intra-articular pressure using sensors in the radiocapitellar and ulnotrochlear joints under varying degrees of radial head resection (0%, 20%, 40%, 100%).
- Applied standardized elbow loading across different flexion angles.
Main Results:
- Pressure distribution remained consistent between joints with intact and partially resected radial heads.
- Radiocapitellar and ulnotrochlear peak contact pressures (PCP) increased significantly with resection.
- A 40% resection resulted in over a 100% increase in PCP, with complete resection causing a 159% increase in ulnotrochlear PCP.
Conclusions:
- Radial head resection, even partially, elevates intra-articular elbow joint pressures.
- Significant pressure increases observed after 40% radial head resection highlight potential risks.
- Findings suggest that preserving the radial head is crucial for maintaining normal joint mechanics.
