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Load sharing and ligament strains in balanced, overstuffed and understuffed UKA. A validated finite element analysis

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Bilgen, Ömer Faruk

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Innocenti, Bernardo
Labey, Luc
Van Lenthe, G. Harry
Vander Sloten, Jos
Catani, Fabio

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Churchill Livingstone Inc Medical Publishers

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Abstract

The aim of this study was to quantify the effects of understuffing and overstuffing UKA on bone stresses, load distribution and ligament strains. For that purpose, a numerical knee model of a cadaveric knee was developed and was validated against experimental measurements on that same knee. Good agreement was found among the numerical and experimental results. This study showed that, even if a medial UKA is well-aligned with normal soft tissue tension and with correct thickness of the tibia component, it induces a stiffness modification in the joint that alters the load distribution between the medial and lateral compartments, the bone stress and the ligament strain potentially leading to an osteoarthritic progression.

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Keywords

UKA, Overstuffing, Understuffing, Tibial stress, Collateral ligament strain, Unicompartmental knee arthroplasty, Follow-up, Numerical sensitivity, 3-dımensıonal model, Joint replacement, Stress-analysis, Tibial plateau, Early failure, 10-year, Behavior, Orthopedics

Citation

Innocenti, B. vd. (2014). "Load sharing and ligament strains in balanced, overstuffed and understuffed UKA. A validated finite element analysis". Journal of Arthroplasty, 29(7), 1491-1498.

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