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2022, Vol. 26 ›› Issue (6): 881-885Digital measurement and analysis of the distal femur in adults with secondary knee valgus deformityYuan Jing1, Sun Xiaohu1, Chen Hui3, Qiao Yongjie3, Wang Lixin2
Abstract: BACKGROUND: The surgical method for knee valgus deformity is osteotomy around the knee joint or total knee arthroplasty. Osteotomy around the knee joint needs three-dimensional shaping. The type of artificial total knee arthroplasty prosthesis and the degree of matching with the knee joint affect the long-term effect after arthroplasty. Femoral condyle osteotomy shaping usually requires the support of femoral condyle data. Nowadays, prosthesis systems designed by westerners have a relatively high usage rate in China, but cannot achieve the best results in the Chinese. OBJECTIVE: To explore the anatomical abnormalities of the femoral condyle, and provide anatomical data for total knee arthroplasty or osteotomy of knee valgus deformity. METHODS: Totally 41 adult patients (53 knees) with knee valgus deformity were detected with CT scan. The obtained images were imported into Mimics 17.0 software, and digital three-dimensional model was established. The anatomical parameters were measured, and the distribution and correlation were analyzed. The knee joint parameters between knee valgus deformity patients and healthy normal knee in single deformity patients (control group, n=29) were compared. RESULTS AND CONCLUSION: (1) Compared with the control group, epicondylar angle was not significantly different in the valgus group (P > 0.05). Medial mechanical femoral angle, distal condylar angle, and poster condylar angle were significantly increased in the valgus group (P < 0.05). (2) Measurement results of the surface profile of the femoral condyle showed that femoral condyle data were significantly lower in the valgus group than that in the control group (P < 0.05). No significant difference in femoral medial condyle data was found between the valgus and control groups (P > 0.05). (3) The distance between the center of the femoral condyle and the condyle line of the femoral condyle was significantly lower in the valgus group than that in the control group (P < 0.05). (4) These findings indicate that the morphological changes of the femoral lateral condyle of adult secondary knee valgus deformity are more significant, but the morphological changes of the femoral medial condyle are not obvious. The femoral condyle axis is used as a reference for adult secondary valgus total knee arthroplasty. The data obtained can help intraoperative positioning and improve the treatment effect. Key words:implant, digital orthopedics, knee valgus, total knee arthroplasty, three-dimensional reconstruction, anatomical variation, morphological parameters |