Morphological matching analysis of tibial prosthesis in Oxford unicompartmental arthroplasty based on different rotational alignments in the Southern Han Chinese population

doi:10.13418/j.issn.1001-165x.2026.5.04

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Chinese Journal of Clinical Anatomy ›› 2026, Vol. 44 ›› Issue (5) : 519-526. DOI: 10.13418/j.issn.1001-165x.2026.5.04

Morphological matching analysis of tibial prosthesis in Oxford unicompartmental arthroplasty based on different rotational alignments in the Southern Han Chinese population

Zhou Junhao¹, Hu Yihui^1,2, Lin Guotai³, Feng Bolin¹, Lin Kewei¹, Luo Jiabao¹, Zhang Ziwei¹, Zhong Huan¹, Ouyang Hanbin¹*

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Abstract

Objective To evaluate the impact of different rotational alignment references for tibial osteotomy on the matching of the tibial component in Oxford unicompartmental knee arthroplasty (UKA) among the Southern Chinese Han population. Methods A retrospective analysis was conducted on computed tomography (CT) imaging data of both lower limbs from 40 cases of Southern Chinese Han adults (80 knees). Three-dimensional (3D) models of the lower limbs were reconstructed. Digital simulations of Oxford UKA were performed on all 80 knees. Tibial osteotomies in the sagittal and axial planes were performed using the sAP line, FAMA line, and the MIR line as references, respectively. 3D models of the resected tibiae were obtained, and morphological parameters of the axial resection plane were measured. A senior joint surgeon selected the appropriate tibial component for simulated implantation and conducted matching analysis. Statistical analysis was then performed on the measurement data. Results ICC analysis indicated excellent consistency between the independent measurements of two surgeons for 20 models (ICC= 0.984, P<0.05). The sAP group demonstrated an aspect ratio closest to the design ratio of the Oxford UKA tibial component. Correspondingly, the prosthesis matching rate was the highest in the sAP osteotomy group (88.8%), followed by the FAMA group (82.5%), and lowest in the MIR group (25.0%), with statistically significant differences among the groups (P<0.05). There was no significant difference in the matching rate between the sAP group and the FAMA group (P>0.05). However, both groups showed significantly higher matching rates compared with the MIR group (P<0.05). Under matching conditions, there was no significant differences between the sAP and FAMA groups in terms of prosthesis coverage or mismatch area across zones. However, the mismatch area in the medial zone for the sAP group was significantly smaller than that of the MIR group (P<0.05). Conclusions Among Southern Chinese Han patients, compared with the MIR line, using either the sAP line or the FAMA line for tibial sagittal osteotomy yields superior matching outcomes for the Oxford unicompartmental tibial prosthesis. The design of next-generation prostheses should be tailored to the tibial morphometry of the Chinese population, with particular attention to refining the parametric design of the anteroposterior dimension and posteromedial curvature.

Key words

Oxford unicompartmental knee arthroplasty; / / Tibial osteotomy; / / Prosthesis matching; / / sAP line; / / Southern Chinese Han population

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Zhou Junhao, Hu Yihui, Lin Guotai, Feng Bolin, Lin Kewei, Luo Jiabao, Zhang Ziwei, Zhong Huan, Ouyang Hanbin. Morphological matching analysis of tibial prosthesis in Oxford unicompartmental arthroplasty based on different rotational alignments in the Southern Han Chinese population[J]. Chinese Journal of Clinical Anatomy. 2026, 44(5): 519-526 https://doi.org/10.13418/j.issn.1001-165x.2026.5.04

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