title: Meta-Analysis of Outcomes of a Single-Radius Versus Multi-Radius Femoral Design in Total Knee Arthroplasty.
abstract: BACKGROUND
  Although the single-radius (SR) femoral design is known to have theoretical advantages in many aspects, studies of clinical outcomes that compare the SR with the multiple-radius (MR) femoral design are controversial. We performed a meta-analysis to address the hypothesis that a SR femoral design in primary total knee arthroplasty improves patient outcomes.
  
  
  METHODS
  The meta-analysis identified 15 articles reporting the clinical outcomes of 2212 knee replacements using the SR (n = 948) compared with the multiradius (MR; n = 1361) femoral design. Comparing SR with MR, we examined the Knee Society Score for the knee (KSS-knee), KSS-function, knee flexion, range of motion, complications, isometric peak torque of knee, and survival rate.
  
  
  RESULTS
  The range of motion of SR knees was lower than that of MR knees. No differences were found in the analyses of KSS-knee, KSS-function, knee flexion, complications, isometric peak torque of the knee, and survival rate.
  
  
  CONCLUSIONS
  Our meta-analysis does not provide clinical support for the previously reported theoretical advantages of the SR implant design.
authors.affiliation: Department of Orthopedics and Orthopedics Oncology Institute of Chinese PLA, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi, P.R.China.
authors.forename: Shiluan
authors.initials: S
authors.lastname: Liu
authors.affiliation: Department of Orthopedics and Orthopedics Oncology Institute of Chinese PLA, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi, P.R.China.
authors.forename: Hua
authors.initials: H
authors.lastname: Long
authors.affiliation: Department of Orthopedics and Orthopedics Oncology Institute of Chinese PLA, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi, P.R.China.
authors.forename: Yinglong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Orthopedics and Orthopedics Oncology Institute of Chinese PLA, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi, P.R.China.
authors.forename: Baoan
authors.initials: B
authors.lastname: Ma
authors.affiliation: Department of Orthopedics and Orthopedics Oncology Institute of Chinese PLA, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi, P.R.China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Li
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D005269:Femur / Q000601:surgery*; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology / Q000601:surgery*; D007720:Knee Prosthesis; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D016896:Treatment Outcome
keywords: constant radius; meta-analysis; multi-radius; single-radius; total knee arthroplasty