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Related Experiment Video

Updated: Mar 16, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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Better functional outcome after single-radius TKA compared with multi-radius TKA.

Isabel Collados-Maestre1, Alejandro Lizaur-Utrilla2,3, Blanca Gonzalez-Navarro1

  • 1Department of Orthopaedic Surgery, Elda University Hospital, Ctra Elda-Sax s/n, 03600, Elda, Alicante, Spain.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|August 15, 2016
PubMed
Summary

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Single-radius total knee arthroplasty (TKA) demonstrated superior outcomes compared to multi-radius TKA. Patients receiving the single-radius design experienced earlier functional improvements and higher satisfaction rates, supporting its recommendation.

Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Clinical biomechanics

Background:

  • Total knee arthroplasty (TKA) is a common procedure for end-stage knee osteoarthritis.
  • Femoral component design is a critical factor influencing TKA outcomes.
  • Comparing single-radius (SR) and multi-radius (MR) designs is essential for optimizing patient function and satisfaction.

Purpose of the Study:

  • To evaluate the impact of femoral component design on patient outcomes after TKA.
  • To compare functional results between single-radius (SR) and multi-radius (MR) TKA designs.

Main Methods:

  • A randomized controlled trial involving 237 patients undergoing TKA.
  • Comparison of SR (118 patients) versus MR (119 patients) TKA designs.
  • Minimum 5-year follow-up with prospective assessments using Knee Society Score (KSS), WOMAC, SF12, quadriceps strength, chair test, and patient satisfaction.
Keywords:
Multi-radiusOutcomesQuadriceps strengthSingle-radiusTotal knee arthroplasty

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Main Results:

  • The SR group showed significantly better KSS, range of motion, extension lag, quadriceps strength, chair test performance, and WOMAC pain scores (p < 0.05).
  • Functional improvements were observed earlier in the SR group, starting from 6 months postoperatively.
  • Patient satisfaction was significantly higher in the SR group (p = 0.032), with similar revision and implant survival rates between groups.

Conclusions:

  • The single-radius cruciate-retaining femoral component demonstrated superior clinical outcomes compared to the multi-radius design.
  • Earlier functional recovery and higher patient satisfaction favor the use of the SR TKA system.
  • While differences were moderate, the SR design is recommended for improved patient experience and functional results.