The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions

• Verfasst von: Eckert, Johannes A. [VerfasserIn]
• Verfasst von: Bitsch, Rudi G. [VerfasserIn]
• Verfasst von: Sonntag, Robert [VerfasserIn]
• Verfasst von: Reiner, Tobias [VerfasserIn]
• Verfasst von: Schwarze, Martin [VerfasserIn]
• Verfasst von: Jäger, Sebastian [VerfasserIn]
• Titel: The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions
• Verf.angabe: J.A. Eckert, R.G. Bitsch, R. Sonntag, T. Reiner, M. Schwarze, S. Jaeger
• E-Jahr: 2022
• Jahr: 7 Feb 2022
• Umfang: 9 S.
• Fussnoten: Gesehen am 03.05.2022
• Titel Quelle: Enthalten in: Bone & joint research
• Ort Quelle: London : British Editorial Soc. of Bone & Joint Surgery, 2012
• Jahr Quelle: 2022
• Band/Heft Quelle: 11(2022), 2, Seite 82-90
• ISSN Quelle: 2046-3758
• DOI: doi:10.1302/2046-3758.112.BJR-2020-0507.R2
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: bone defects
• Sach-SW: femora
• Sach-SW: femoral component
• Sach-SW: flexion
• Sach-SW: hip
• Sach-SW: knee flexion
• Sach-SW: knees
• Sach-SW: Oxford unicompartmental knee arthroplasty
• Sach-SW: posterior condyle
• Sach-SW: Single peg
• Sach-SW: standard deviation
• Sach-SW: Twin peg
• K10plus-PPN: 1800766130

Abstract

Aims - - The cemented Oxford unicompartmental knee arthroplasty (OUKA) features two variants: single and twin peg OUKA. The purpose of this study was to assess the stability of both variants in a worst-case scenario of bone defects and suboptimal cementation. - - Methods - - Single and twin pegs were implanted randomly allocated in 12 pairs of human fresh-frozen femora. We generated 5° bone defects at the posterior condyle. Relative movement was simulated using a servohydraulic pulser, and analyzed at 70°/115° knee flexion. Relative movement was surveyed at seven points of measurement on implant and bone, using an optic system. - - Results - - At the main fixation zone, the twin peg shows less relative movement at 70°/115°. At the transition zone, relative movements are smaller for the single peg for both angles. The single peg shows higher compression at 70° flexion, whereas the twin peg design shows higher compression at 115°. X-displacement is significantly higher for the single peg at 115°. - - Conclusion - - Bony defects should be avoided in OUKA. The twin peg shows high resilience against push-out force and should be preferred over the single peg. - - Cite this article: Bone Joint Res 2022;11(2):82-90.