What is the influence of tibial component posterior slope on clinical and radiographic outcomes following cemented medial unicompartmental fixed-bearing knee arthroplasty? A retrospective study with a minimum follow-up of five years.

IF 2.6 3区医学 Q2 ORTHOPEDICS

International Orthopaedics Pub Date : 2025-06-25 DOI:10.1007/s00264-025-06579-0

Maksym Polt, Titus Thut, David Alexander Graf, Naeder Helmy, Octavian Andronic

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Abstract

Purpose: To evaluate how changing the native posterior tibial slope (PTS) through implantation of a cemented medial unicompartmental knee arthroplasty (UKA) impacts clinical and radiographic outcomes, specifically whether it correlates with the occurrence of tibial periprosthetic radiolucency or tibial aseptic loosening (AL).

Methods: This retrospective study analyzed 63 patients with cemented medial UKAs with a minimum follow-up of five years. Patient-reported outcomes (PROMs) included the Oxford Knee Score (OKS). Radiographic parameters assessed were: PTS, mechanical axis, prosthetic joint space height, tibial component obliquity, intraprosthetic divergence, and tibial periprosthetic radiolucency. Partial Pearson correlation and multiple linear regression analyses were used to evaluate the relationship between tibial periprosthetic radiolucency and demographic or radiographic parameters.

Results: Of 63 patients (mean age 68.9 ± 7.9 years, follow-up 62.5 ± 8.8 months), 5 knees (7.9%) demonstrated tibial periprosthetic radiolucency ≥ 2 mm. The mean postoperative PTS change was 3.8 ± 2.6°, mechanical axis change: 2.5 ± 1.8°, prosthetic joint space height: 9.2 ± 3.1 mm, tibial component obliquity: 2.5° ± 3°, and intraprosthetic divergence angle: 5° ± 4°. OKS averaged 43.9 (range 22-48), with a mean knee flexion of 123.4 ± 6.8°. Statistical analysis showed no significant associations between tibial periprosthetic radiolucency and demographics, radiographic parameters, or PROMs. Changes in PTS did not correlate with a range of motion (ROM), PROMs, or radiolucency.

Conclusion: In our cohort, the deviation from native PTS following implantation of the cemented tibial component did not show a significant correlation with tibial periprosthetic radiolucency, PROMs, or ROM at mid-term follow-up.

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胫骨假体后斜度对骨水泥内侧单腔固定膝关节置换术后临床和影像学结果的影响是什么？回顾性研究，至少随访5年。

目的：评估通过植入骨水泥内侧单室膝关节置换术（UKA）改变天然胫骨后坡（PTS）对临床和影像学结果的影响，特别是它是否与胫骨假体周围放射透光度或胫骨无菌性松动（AL）的发生有关。方法：本回顾性研究分析了63例骨水泥内侧UKAs患者，随访时间至少为5年。患者报告的预后（PROMs）包括牛津膝关节评分（OKS）。影像学参数评估为：PTS、机械轴、假体关节间隙高度、胫骨组件倾角、假体内部散度和胫骨假体周围透光度。采用偏Pearson相关和多元线性回归分析来评估胫骨假体周围放射率与人口统计学或放射学参数之间的关系。结果：63例患者（平均年龄68.9±7.9岁，随访62.5±8.8个月），5例膝关节（7.9%）胫骨假体周围透光度≥2mm。术后平均PTS变化3.8±2.6°，机械轴变化2.5±1.8°，假体关节间隙高度9.2±3.1 mm，胫骨组件倾角2.5°±3°，假体内发散角5°±4°。OKS平均43.9（范围22-48），平均膝关节屈曲123.4±6.8°。统计分析显示，胫骨假体周围的放射率与人口统计学、放射学参数或prom之间没有显著关联。PTS的变化与活动度（ROM）、prom或放射率无关。结论：在我们的队列中，在中期随访中，植入骨水泥胫骨假体后与原始PTS的偏差与胫骨假体周围放射率、prom或ROM没有显着相关性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Orthopaedics 医学-整形外科

CiteScore

5.50

自引率

7.40%

发文量

360

审稿时长

1 months

期刊介绍： International Orthopaedics, the Official Journal of the Société Internationale de Chirurgie Orthopédique et de Traumatologie (SICOT) , publishes original papers from all over the world. The articles deal with clinical orthopaedic surgery or basic research directly connected with orthopaedic surgery. International Orthopaedics will also link all the members of SICOT by means of an insert that will be concerned with SICOT matters. Finally, it is expected that news and information regarding all aspects of orthopaedic surgery, including meetings, panels, instructional courses, etc. will be brought to the attention of the readers. Manuscripts submitted for publication must contain a statement to the effect that all human studies have been approved by the appropriate ethics committee and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki. It should also be stated clearly in the text that all persons gave their informed consent prior to their inclusion in the study. Details that might disclose the identity of the subjects under study should be omitted. Reports of animal experiments must state that the "Principles of laboratory animal care" (NIH publication No. 85-23, revised 1985) were followed, as well as specific national laws (e.g. the current version of the German Law on the Protection of Animals) where applicable. The editors reserve the right to reject manuscripts that do not comply with the above-mentioned requirements. The author will be held responsible for false statements or for failure to fulfil the above-mentioned requirements.