title: Load sharing and ligament strains in balanced, overstuffed and understuffed UKA. A validated finite element analysis.
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.
authors.affiliation: European Centre for Knee Research, Smith&Nephew, Leuven, Belgium; BEAMS Department, Université Libre de Bruxelles, Brussels, Belgium.
authors.forename: Bernardo
authors.initials: B
authors.lastname: Innocenti
authors.affiliation: Department of Orthopaedia, School of Medicine, University of Uludağ, Bursa, Turkey.
authors.forename: Ömer Faruk
authors.initials: ÖF
authors.lastname: Bilgen
authors.affiliation: European Centre for Knee Research, Smith&Nephew, Leuven, Belgium.
authors.forename: Luc
authors.initials: L
authors.lastname: Labey
authors.affiliation: Biomechanics Section, KU Leuven, Leuven, Belgium.
authors.forename: G Harry
authors.initials: GH
authors.lastname: van Lenthe
authors.affiliation: Biomechanics Section, KU Leuven, Leuven, Belgium.
authors.forename: Jos Vander
authors.initials: JV
authors.lastname: Sloten
authors.affiliation: Orthopaedics and Traumatology Department, Modena Policlinic, Modena, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Catani
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D002102:Cadaver; D004867:Equipment Design; D020342:Finite Element Analysis; D006801:Humans; D007719:Knee Joint / Q000601:surgery*; D008022:Ligaments / Q000601:surgery; D017888:Medial Collateral Ligament, Knee / Q000601:surgery*; D008962:Models, Theoretical; D010003:Osteoarthritis / Q000503:physiopathology; D020959:Polyethylene / Q000737:chemistry; D015203:Reproducibility of Results; D013314:Stress, Mechanical; D013977:Tibia / Q000601:surgery
chemical_list: D020959:Polyethylene
keywords: UKA; collateral ligament strain; overstuffing; tibial stress; understuffing