PuSH - Publikationsserver des Helmholtz Zentrums München: Personalized joint replacement: Landmark-free morphometric analysis of distal radii.

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Remus, S.L.* ; Brugetti, K.* ; Zimmer, V.A.* ; Hesse, N.* ; Reidler, P.L.* ; Giunta, R.E.* ; Schnabel, J.A. ; Demmer, W.*

Personalized joint replacement: Landmark-free morphometric analysis of distal radii.

J Funct. Morphol. Kinesiol. 10:71 (2025)

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Background: Fractures of the distal radius are common, particularly among young men and elderly women, often leading to painful wrist arthritis, especially if the joint surface has been affected. Traditional treatments of the wrist, such as full or partial wrist fusion, limit movement, and common wrist prostheses have high complication rates. Regenerative medicine and 3D bioprinting offer the potential for personalized joint replacements. Methods: This study evaluates using the contralateral radius as a template for creating customized distal radius prostheses. Bilateral CT scans of healthy wrists were analyzed to assess the shape and symmetry of the distal radius using a landmark-free morphometric method. Instead of comparing defined landmarks, the entire surface of the radius is analyzed employing dense point- and deformation-based morphometry to detect subtle morphological differences, providing an unbiased and more accurate comparison of the overall deformations in the distal radii. Results: results show strong intraindividual symmetry in joint surfaces. Interindividual comparisons revealed significant morphological variations, particularly gender-specific differences. Conclusions: These findings support the use of the contralateral radius as a template for the replaced side. At the same time, the interindividual results endorse the approach of pursuing personalized prostheses as the optimal replacement for distal joint surfaces. The increasing improvement of 3D-printed prostheses promises new methods for better outcomes in distal radius arthrosis after intraarticular fractures. Further research into clinical applications and biocompatible 3D printing materials is recommended.

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