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Findings support radial tuberosity preservation in distal biceps repair
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Results from mechanical testing showed both a significant reduction in radial tuberosity height and decrease in the moment arm at 60° of supination with use of trough repair compared with anatomic distal biceps repair.
“The anterior protuberance of the radial tuberosity functions as a supination cam; therefore, consideration should be given to preserve its topographical anatomy during a distal biceps repair,” the researchers wrote.
Researchers measured elbow flexion force efficiency and the isometric supination moment arm in 10 matched pairs of upper limbs from cadavers. Investigators used stereophotogrammetry to reconstruct the geometry of the proximal aspect of the radius. A 3-D model was used to reconstruct the repair sites and calculate trough disturbance on the native anatomy.
Findings from the post-hoc test revealed that at 60° of supination, trough repair specimens had a 27% lower supination moment arm compared with that of anatomic repair specimens. The anatomic repair group had an average tuberosity distance of 11 mm, and the trough repair group had an average distance of 8.3 mm. Investigators noted no significant differences between the repair groups with regard to pronation and neutral arm positioning.
Trough repairs lost 25% of the tuberosity distance due to the trough, and investigators found a significant association between tuberosity distance and the supination moment arm in the supination position.‒ by Monica Jaramillo
Disclosures: Schmidt reports he is a paid consultant for Arthrex, Inc. Please see the full study for a list of all other author’s relevant financial disclosures.
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