Emre Bilgin1, Hasan Bombacı2, Ali Turgut1, Önder Kalenderer1, Bekir Eray Kılınç3, Levent Adıyeke2, Mücahit Görgeç4. 1. Health Science University Tepecik Training and Research Hospital Department of Orthopaedics and Traumatology, İzmir, Turkey. 2. Health Science University Haydarpaşa Numune Training and Research Hospital Department of Orthopaedics and Traumatology, İstanbul, Turkey. 3. Gölhisar State Hospital Department of Orthopaedics and Traumatology, Burdur, Turkey. 4. Orthopaedics and Traumatology Surgeon, Private Clinic, İstanbul, Turkey.
Abstract
OBJECTIVE: To analyze the effect of tibiofemoral mechanical axis (TFMA) deviation severity on clinical outcomes after total knee arthroplasty (TKA). METHODS: We retrospectively reviewed the patients who underwent primary TKA between January 2002 and December 2010. After applying inclusion/exclusion criteria, we evaluated 70 knees of 51 patients. The mean ± SD follow-up period was 7.08 ± 1.34 years. The knees were divided into 3 groups based on TFMAs. The first group, identified as "well aligned," included the TFMAs that were neutral within 3° (0° ± 3°) of alignment. The second group, identified as "outliers 1," included the slightly deviated TFMAs (-3° to -6° valgus and +3° to +6° varus). The third group, identified as "outliers 2," included the severely deviated TFMAs of more than 6° from neutral alignment (<-6° valgus and > + 6° varus). The clinical outcomes of each group were compared by evaluating the Oxford Knee Score (OKS), visual analog scale (VAS), and Short Form-36 physical component summary (SF-36 PCS) and mental component summary (SF-36 MCS) scores. RESULTS: We found that OKS, SF-36 PCS, and SF-36 MCS were nearly the same in the well-aligned and outliers 1 groups but worse in the outliers 2 group. VAS scores were nearly the same in all groups. (p > 0.05). CONCLUSION: Function scores were impaired when the TFMA deviated more than 6° from neutral. However, the differences in clinical outcomes between well-aligned knees and those of outliers were not found to be statistically significant in the medium term.
OBJECTIVE: To analyze the effect of tibiofemoral mechanical axis (TFMA) deviation severity on clinical outcomes after total knee arthroplasty (TKA). METHODS: We retrospectively reviewed the patients who underwent primary TKA between January 2002 and December 2010. After applying inclusion/exclusion criteria, we evaluated 70 knees of 51 patients. The mean ± SD follow-up period was 7.08 ± 1.34 years. The knees were divided into 3 groups based on TFMAs. The first group, identified as "well aligned," included the TFMAs that were neutral within 3° (0° ± 3°) of alignment. The second group, identified as "outliers 1," included the slightly deviated TFMAs (-3° to -6° valgus and +3° to +6° varus). The third group, identified as "outliers 2," included the severely deviated TFMAs of more than 6° from neutral alignment (<-6° valgus and > + 6° varus). The clinical outcomes of each group were compared by evaluating the Oxford Knee Score (OKS), visual analog scale (VAS), and Short Form-36 physical component summary (SF-36 PCS) and mental component summary (SF-36 MCS) scores. RESULTS: We found that OKS, SF-36 PCS, and SF-36 MCS were nearly the same in the well-aligned and outliers 1 groups but worse in the outliers 2 group. VAS scores were nearly the same in all groups. (p > 0.05). CONCLUSION: Function scores were impaired when the TFMA deviated more than 6° from neutral. However, the differences in clinical outcomes between well-aligned knees and those of outliers were not found to be statistically significant in the medium term.