title: Mid-term Results of Single-Radius Cruciate Retaining Total Knee Arthroplasty: Minimum 5 Year Follow-up.
abstract: OBJECTIVE
  The single-radius design of the knee implant was introduced to improve the results of total knee arthroplasty (TKA) by reducing maximum extensor forces, and it also represents more physiologic quadriceps force pattern, which could have a positive effect on knee function after TKA. We studied mid-term results of single-radius designed cruciate retaining (CR) TKA.
  
  
  METHODS
  We analyzed the functional improvement and radiological osteolytic pattern after TKA using the single-radius Scorpio CR prosthesis. TKA was performed on 102 knees. The mean follow-up period was 73.8 months. For clinical assessment, the range of motion (ROM), Harris hip score, and functional outcome score were obtained preoperatively and at last follow-up.
  
  
  RESULTS
  The average ROM was 100.2° preoperatively and 121.7° at last follow-up. The average knee score was 59.2 points preoperatively and 92.9 points at last follow-up. The average functional outcome score was improved from 51.9 points preoperatively to 85.4 points at last follow-up. Radiolucency was observed in four knees but all were non-progressive lesions smaller than 2 mm.
  
  
  CONCLUSIONS
  The clinical outcome of TKA using the single-radius CR prosthesis was good during the mid-term follow-up and the incidence of osteolysis was very rare.
authors.affiliation: Department of Nursing School, Chodang University, Muan, Korea.
authors.forename: Kwang Mee
authors.initials: KM
authors.lastname: Kim
authors.affiliation: Department of Orthopedic Surgery, Wonkwang University School of Medicine & Hospital, Iksan, Korea.
authors.forename: Keun Churl
authors.initials: KC
authors.lastname: Chun
authors.affiliation: Department of Orthopedic Surgery, Wonkwang University School of Medicine & Hospital, Iksan, Korea.
authors.forename: Jae Sun
authors.initials: JS
authors.lastname: Hwang
authors.affiliation: Department of Orthopedic Surgery, Wonkwang University School of Medicine & Hospital, Iksan, Korea.
authors.forename: Churl Hong
authors.initials: CH
authors.lastname: Chun
keywords: Arthroplasty; Cruciate-retaining; Knee; Single-radius