Does component axial rotational alignment affect clinical outcomes in Oxford unicompartmental knee arthroplasty?
| Autor: | Yuk Wah Hung, Chun Man Lau, Jonathan Patrick Ng, Yik Cheung Wan, Jason Chi Ho Fan, Wang Wai Chau, Tycus Tao Sun Tse |
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| Rok vydání: | 2020 |
| Předmět: |
musculoskeletal diseases
Male Knee Joint medicine.medical_treatment High variability Rotation 03 medical and health sciences 0302 clinical medicine medicine Humans Orthopedics and Sports Medicine Tibial rotation Femur Femoral component Unicompartmental knee arthroplasty Arthroplasty Replacement Knee Rotational alignment Aged Retrospective Studies Orthodontics Aged 80 and over 030222 orthopedics Tibia business.industry 030229 sport sciences Middle Aged External rotation Component (group theory) Female business Knee Prosthesis Tomography X-Ray Computed |
| Zdroj: | The Knee. 27(6) |
| ISSN: | 1873-5800 |
| Popis: | Background Limited studies have examined the relationship between axial rotational alignment and functional outcome in mobile-bearing UKA. The aims of this study was to determine the correlation between component axial rotational alignment and functional outcomes, and to recommend a safety range for component rotation for Oxford UKA. Methods A retrospective study of 83 Oxford UKA was performed in 67 patients. Postoperative CT scans and clinical assessments were performed at a mean follow up of 21 months. Functional outcomes were measured by the OKS, modified KSS and KFS scores. A moving threshold analysis was performed to evaluate the relationship between different rotational alignment cut-off values and functional outcome scores. Results The mean femoral and tibial components were positioned with a mean of 4.8° and 7.5° external rotation (ER), respectively. Increasing tibial external rotation was negatively correlated with clinical outcome scores while increasing femoral component rotation did not correlate with clinical outcomes. Better functional scores were observed at mean femoral and tibial rotation angles between 2–6° ER (1.2–6.6°) and 1–8° ER (0.5–8.8°), respectively; with the highest OKS, KSS and FKS observed at 3–4° ER for femoral component, and 4–5° ER for tibial component. Conclusion Femoral component axial rotation between 2°- 6° ER, and tibial component axial rotation between 1° and 8° ER correlated with significantly better functional scores. Surgeons should be especially aware of the relatively high variability in tibial component rotation and its implications of functional outcomes. |
| Databáze: | OpenAIRE |
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