Comparison of functional outcomes between single-radius and multi-radius femoral components in primary total knee arthroplasty: a meta-analysis of randomized controlled trials

Abstract

Purpose Our purpose in the current meta-analysis was to compare the functional outcomes in patients who have received single-radius (SR) or multi-radius (MR) femoral components in randomized controlled trials (RCTs) for primary total knee arthroplasty (TKA). The hypothesis was that there would be no statistically significant difference between two groups in terms of functional outcomes. Materials and methods We searched the international electronic databases PubMed, Embase, and the Cochrane Central Register of Controlled Trials up to February 2020 for RCTs that compared functional outcomes of SR and MR femoral component designs after primary TKA. We performed a meta-analysis of nine RCTs using the Knee Society Score for the knee (KSS-knee), KSS-function, Knee Injury and Osteoarthritis Outcome Score (KOOS), Oxford Knee Score (OKS), degree of knee flexion, extension, and complications, including postoperative infection and revision surgery. Results The meta-analysis revealed no statistically significant differences in all the analyzed variables, including KSS-knee, KSS-function, KOOS, OKS, knee flexion, and knee extension. For postoperative complications, no statistically significant differences were detected for femoral component designs in postoperative infection or incidence of revision surgery between the two groups. Conclusions The current meta-analysis of RCTs did not show any statistically significant differences between SR and MR femoral component designs in terms of postoperative functional outcomes. Evaluated outcomes included functional outcome scores, degree of knee flexion, extension, and complications. However, because of the limited clinical evidence of this study owing to the heterogeneity between the included RCTs, a careful approach should be made in order not to arrive at definite conclusions.

Potential New Treatments for Knee OA: A Prospective Review of Registered Trials

“…It attempts, at least in theory, to provide more lever arm for the extensor mechanism and thus improve strength. Current evidence did not show any significant differences between these two femoral component designs regarding functional outcomes [18].…”

The Effect of Prosthesis Type on Intraoperative Soft-Tissue Balance and Clinical Outcomes in Modified Kinematically Aligned Cruciate-Retaining Total Knee Arthroplasty

“…In a meta-analysis investigating the functional outcomes in patients who have received SR or MR femoral components in randomized controlled trials for primary MA-TKA, no significant differences were found between the two groups. 32 In the future, a detailed comparison between MA and KA-TKA with SR or MR prosthesis should be performed.…”

Current applications of gait analysis after total knee arthroplasty: A scoping review

“…The effect of the single-radius implant has been well studied with 2D analysis. 24 This implant type is defined as a single spherical radius with a locus between 10 and 120 . 24 There is evidence to suggest that this implant design may be associated with a statistically significant improvement in motion analysis parameters.…”

“…24 This implant type is defined as a single spherical radius with a locus between 10 and 120 . 24 There is evidence to suggest that this implant design may be associated with a statistically significant improvement in motion analysis parameters. Specifically, decreased flexion peak torque, increased extension peak torque, and lower flexor/extensor ratio were seen in combination with increased KSS scores from 80.3 ± 1.90 to 86.6 ± 1.89 with this implant type.…”