Decreased Radial Inclination Without Dorsal Angulation Attenuates the Biomechanical Effects of Ulnar Abutment Syndrome: A Finite Element Analysis

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To evaluate the impact of decreased radial inclination on ulnar abutment mechanics while maintaining normal volar tilt and varying ulnar variance.
Analyzed nine cadaveric forearms using computed tomography to create finite element models.
Developed five models per specimen, varying radial inclination while keeping volar tilt normal.
Simulated gripping loads to assess contact forces and stresses at the ulnar head and surrounding structures.
Contact force at the ulnar head decreased from 70.61 N to 44.29 N with radial inclination loss, not statistically significant after correction.
Equivalent and minimum principal stresses at the lunate were significantly lower with reduced radial inclination under modeled conditions.

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Evaluates how loss of radial inclination affects ulnar abutment mechanics, suggesting critical biomechanical insights.

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Suzuki et al. (2026) studied this question.

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