Original Article Knee Surg Relat Res 2017;29(2):122-128 https://doi.org/10.5792/ksrr.16.045 pISSN 2234-0726 · eISSN 2234-2451
Knee Surgery & Related Research
Mid-Term Results of Oxford Medial Unicompartmental Knee Arthroplasty in Young Asian Patients Less than 60 Years of Age: A Minimum 5-Year Follow-up Yeong-Joon Kim, MD, Bu-Hwan Kim, MD, Seong-Ho Yoo, MD, Suk-Woong Kang, MD, Chang-Hun Kwack, MD, and Moo-Ho Song, MD Department of Orthopaedic Surgery, Daedong General Hospital, Busan, Korea
Purpose: The purpose of this study was to evaluate the efficacy of unicompartmental knee arthroplasty (UKA) in young active Asian patients by analyzing clinical outcomes, complications and survival rates. Materials and Methods: Eighty-two knees were evaluated with a minimum follow-up of 5 years after Oxford phase 3 UKA in patients less than 60 years of age at the time of surgery. Their mean age was 54.7 years (range, 44 to 59 years). The mean follow-up period was 8.9 years (range, 5.3 to 12 years). Kaplan–Meier survivorship analysis was used to estimate implant survival. Results: Including 3 bearing dislocations, 1 medial tibial collapse and 1 lateral osteoarthritis, the total complication rate was 6.1% (5/82). Of the 3 cases of bearing dislocation, 2 cases were resolved by replacing with a thicker bearing and 1 case was converted to total knee arthroplasty (TKA) due to repeated dislocation. The two knees with a medial tibial collapse and a lateral osteoarthritis were converted to TKA. The 10-year cumulative survival rate using Kaplan-Meier survival method was 94.7% (95% confidence interval: 88.7%–100%). Conclusions: Oxford medial UKA was reliable and effective in young active Asian patients providing good clinical results and survival rate in the mid-term follow-up. Keywords: Knee, Osteoarthritis, Arthroplasty, Unicompartmental, Mobile bearing, Asian, Young age
Introduction Unicompartmantal knee arthroplasty (UKA) for the treatment of isolated compartment osteoarthritis of the knee has been continuously improved since its introduction in the 1950s. In 1989, Kozinn and Scott1) reported the ideal candidates for UKA as inactive elderly (≥60 years old) patients. Active patients and manual laborers were described as inappropriate candidates due to the Received August 15, 2016; Revised (1st) October 7, 2016; (2nd) November 9, 2016; Accepted December 20, 2016 Correspondence to: Moo-Ho Song, MD Department of Orthopaedic Surgery, Daedong General Hospital, 187 Chungnyeol-daero, Dongnae-gu, Busan 47737, Korea Tel: +82-451-554-8996, Fax: +82-451-553-7575 E-mail: [email protected] This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
risk of mechanical failure and component loosening increased by repetitive high-impact loading. Thus,
Knee Surgery & Related Research
Mid-Term Results of Oxford Medial Unicompartmental Knee Arthroplasty in Young Asian Patients Less than 60 Years of Age: A Minimum 5-Year Follow-up Yeong-Joon Kim, MD, Bu-Hwan Kim, MD, Seong-Ho Yoo, MD, Suk-Woong Kang, MD, Chang-Hun Kwack, MD, and Moo-Ho Song, MD Department of Orthopaedic Surgery, Daedong General Hospital, Busan, Korea
Purpose: The purpose of this study was to evaluate the efficacy of unicompartmental knee arthroplasty (UKA) in young active Asian patients by analyzing clinical outcomes, complications and survival rates. Materials and Methods: Eighty-two knees were evaluated with a minimum follow-up of 5 years after Oxford phase 3 UKA in patients less than 60 years of age at the time of surgery. Their mean age was 54.7 years (range, 44 to 59 years). The mean follow-up period was 8.9 years (range, 5.3 to 12 years). Kaplan–Meier survivorship analysis was used to estimate implant survival. Results: Including 3 bearing dislocations, 1 medial tibial collapse and 1 lateral osteoarthritis, the total complication rate was 6.1% (5/82). Of the 3 cases of bearing dislocation, 2 cases were resolved by replacing with a thicker bearing and 1 case was converted to total knee arthroplasty (TKA) due to repeated dislocation. The two knees with a medial tibial collapse and a lateral osteoarthritis were converted to TKA. The 10-year cumulative survival rate using Kaplan-Meier survival method was 94.7% (95% confidence interval: 88.7%–100%). Conclusions: Oxford medial UKA was reliable and effective in young active Asian patients providing good clinical results and survival rate in the mid-term follow-up. Keywords: Knee, Osteoarthritis, Arthroplasty, Unicompartmental, Mobile bearing, Asian, Young age
Introduction Unicompartmantal knee arthroplasty (UKA) for the treatment of isolated compartment osteoarthritis of the knee has been continuously improved since its introduction in the 1950s. In 1989, Kozinn and Scott1) reported the ideal candidates for UKA as inactive elderly (≥60 years old) patients. Active patients and manual laborers were described as inappropriate candidates due to the Received August 15, 2016; Revised (1st) October 7, 2016; (2nd) November 9, 2016; Accepted December 20, 2016 Correspondence to: Moo-Ho Song, MD Department of Orthopaedic Surgery, Daedong General Hospital, 187 Chungnyeol-daero, Dongnae-gu, Busan 47737, Korea Tel: +82-451-554-8996, Fax: +82-451-553-7575 E-mail: [email protected] This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
risk of mechanical failure and component loosening increased by repetitive high-impact loading. Thus,
