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Do the radial head prosthesis components fit with the anatomical structures of the proximal radioulnar joint?

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Abstract

Purpose

The fitting accuracy of radial head components has been investigated in the capitulo-radial joint, and reduced contact after prosthetic replacement of the radial head has been observed. The kinematics of the proximal radioulnar joint (PRUJ) are affected by radial head arthroplasty as well, but have not yet been investigated in this regard.

Methods

The elbow joints of 60 upper extremities of formalin-fixed body donors were disarticulated to obtain a good view of the PRUJ. Each specimen was mounted on the examining table and radial head position in the native PRUJ was assessed in neutral position, full pronation, and full supination. Measurements were repeated after implantation of mono- and bi-polar prostheses.

Results

Analysis of the distribution of the joint contacts in the compartments showed significant differences after radial head replacement. In comparison to the native joint, after bipolar and monopolar radial head replacement, the physiological shift of the proximal radius was altered.

Discussion

The physiological shift of the joint contact of the radial head from anterior to posterior during forearm rotation that was found in the native joint in our cadaver model was not observed after prosthetic replacement. With higher conformity and physiological kinematic of radial head prostheses, possibly lower shear forces and lower contact pressures would be generated.

Clinical relevance

The tested radial head prostheses do not replicate the physiological kinematics of the radial head. Further development in the prosthesis design has to be made. The meticulous reconstruction of the annular ligament seems to be of importance to increase joint contact.

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Conflict of interest

KW, KJB and LPM receive payments from the Tornier company (Tornier, Saint-Ismier, France) for ongoing consultancy. The other authors, their immediate family, and any research foundation with which they are affiliated did not receive any financial payments or other benefits from any commercial entity related to the subject of this article.

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Correspondence to Kilian Wegmann.

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Wegmann, K., Hain, M.K., Ries, C. et al. Do the radial head prosthesis components fit with the anatomical structures of the proximal radioulnar joint?. Surg Radiol Anat 37, 743–747 (2015). https://doi.org/10.1007/s00276-014-1407-2

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  • DOI: https://doi.org/10.1007/s00276-014-1407-2

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