MENG Chen 1,2 , XU Yongqing 1 , SHI Rongmao 1 , PU Luqiao 1 , JI Jian’an 3 , YAO Xingyou 4 , ZHOU Xizong 5 , LI Chuan 1
  • 1. Department of Orthopedics, 920th Hospital of the Joint Logistics Support Force of Chinese PLA, Kunming Yunnan, 650000, P. R. China;
  • 2. Graduate School, Kunming Medical University, Kunming Yunnan, 650000, P. R. China;
  • 3. Department of Orthopedics, Lijiang People’s Hospital, Lijiang Yunnan, 674100, P. R. China;
  • 4. Department of Orthopedics, Wenshan People’s Hospital, Wenshan Yunnan, 663000, P. R. China;
  • 5. Department of Orthopedics, Yanjin People’s Hospital, Yanjin Yunnan, 657500, P. R. China;
LI Chuan, Email: lichuankaka@163.com
Navigation-free robot; total knee arthroplasty; knee osteoarthritis; extra-articular deformities; lower limb alignment
10.7507/1002-1892.202408061
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Objective  To evaluate the early effectiveness of navigation-free robot-assisted total knee arthroplasty (TKA) compared to traditional TKA in the treatment of knee osteoarthritis combined with extra-articular deformities.Methods  The clinical data of 30 patients with knee osteoarthritis combined with extra-articular deformities who met the selection criteria between June 2019 and January 2024 were retrospectively analyzed. Fifteen patients underwent CORI navigation-free robot-assisted TKA and intra-articular osteotomy (robot group) and 15 patients underwent traditional TKA and intra-articular osteotomy (traditional group). There was no significant difference in age, gender, body mass index, affected knee side, extra-articular deformity angle, deformity position, deformity type, and preoperative knee range of motion, American Knee Society (KSS) knee score and KSS function score, and lower limb alignment deviation between the two groups (P>0.05). The operation time, intraoperative blood loss, and complications of the two groups were recorded and compared. The knee range of motion and lower limb alignment deviation were recorded before operation and at 6 months after operation, and the knee joint function was evaluated by KSS knee score and function score. Results  There was no significant difference in operation time between the two groups (P>0.05); the intraoperative blood loss in the robot group was significantly less than that in the traditional group (P<0.05). Patients in both groups were followed up 6-12 months, with an average of 8.7 months. The incisions of all patients healed well, and there was no postoperative complication such as thrombosis or infection. At 6 months after operation, X-ray examination showed that the position of the prosthesis was good in both groups, and there was no loosening or dislocation of the prosthesis. The knee joint range of motion, the lower limb alignment deviation, and the KSS knee score and KSS function score significantly improved in both groups (P<0.05). The changes of lower limb alignment deviation and KSS function score before and after operation in the robot group were significantly better than those in the traditional group (P<0.05), while the changes of other indicators before and after operation in the two groups were not significant (P>0.05). Conclusion  Compared to traditional TKA, navigation-free robot-assisted TKA for knee osteoarthritis with extra-articular deformities results in less intraoperative blood loss, more precise reconstruction of lower limb alignment, and better early effectiveness. However, long-term effectiveness require further investigation.

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