Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (21): 3300-3304.doi: 10.3969/j.issn.2095-4344.3857

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Relationship between tibio-femoral mechanical axis deviation on coronal plane and early joint function recovery after total knee arthroplasty

Mieralimu•Muertizha, Ainiwaerjiang•Damaola, Lin Haishan, Wang Li    

  1. Department of Orthopedics, Joint and Geriatric Osteopathy, People’s Hospital of Xinjiang Uygur Autonomous Region, Urumqi 830001, Xinjiang Uygur Autonomous Region, China
  • Received:2020-08-05 Revised:2020-08-11 Accepted:2020-09-11 Online:2021-07-28 Published:2021-01-23
  • Contact: Wang Li, Master, Chief physician, Department of Orthopedics, Joint and Geriatric Osteopathy, People’s Hospital of Xinjiang Uygur Autonomous Region, Urumqi 830001, Xinjiang Uygur Autonomous Region, China
  • About author:Mieralimu•Muertizha, Master, Attending physician, Department of Orthopedics, Joint and Geriatric Osteopathy, People’s Hospital of Xinjiang Uygur Autonomous Region, Urumqi 830001, Xinjiang Uygur Autonomous Region, China
  • Supported by:
    a grant from People’s Hospital of Xinjiang Uygur Autonomous Region, No. 20190406 (to MM)

Abstract: BACKGROUND: Total knee arthroplasty is the most effective treatment method for the end-stage knee diseases. However, the influence of the neutral alignment of lower limb on coronal plane on the clinical outcomes after surgery is still controversial.
OBJECTIVE: To investigate the effect of tibio-femoral mechanical axis deviation degree on coronal plane on the joint function and clinical outcomes after total knee arthroplasty. 
METHODS: Sixty patients with primary knee osteoarthritis aged (66.8±5.0) years from the People’s Hospital of Xinjiang Uygur Autonomous Region from January 2015 to December 2017 who underwent unilateral total knee arthroplasty were retrospectively analyzed. At the last follow-up, full-length radiographs were taken and tibio-femoral mechanical axis values were measured. The patients were divided into three groups: neutral position group (0° ≤ included angle ≤ 3°, n=25), mild deviation group (3°-6°, n=21), and severe deviation group (included angle > 6°, n=14) according to the tibio-femoral mechanical axis during the last follow-up. OKS, visual analogue scale score, and SF-12 health questionnaire scores were also compared among the three groups at the last follow-up. The trial was approved by the hospital ethics committee. 
RESULTS AND CONCLUSION: (1) There were no incision healing problems, deep vein thrombosis, periprosthesis infection, prosthesis loosening, or other complications during the follow-up in the three groups. (2) There was no significant difference in OKS and visual analogue scale scores among the three groups (P > 0.05). The SF-12 health questionnaire scores of severe deviation group were lower than those of the other two groups (P < 0.05). (3) The results showed that when the tibio-femoral mechanical axis deviated from the center of the line of lower limbs by 3°-6° after total knee arthroplasty, there was no significant influence on the postoperative function and quality of life of the patients. Deviation from the center of the line of lower limbs by more than 6° may have a corresponding impact on the postoperative clinical outcomes of patients.   

Key words: bone, prosthesis, osteoarthritis, total knee arthroplasty, tibio-femoral mechanical axis, lower limb force line

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