Clinical Orthopaedics and Related Research®

, Volume 468, Issue 5, pp 1214–1220 | Cite as

Functional Performance with a Single-radius Femoral Design Total Knee Arthroplasty

  • Enrique Gómez-BarrenaEmail author
  • Carmelo Fernandez-García
  • Almudena Fernandez-Bravo
  • Raquel Cutillas-Ruiz
  • Gloria Bermejo-Fernandez
Symposium: Current Issues in Knee Reconstruction



Better muscular recovery of the extensor mechanism after TKA is claimed by femoral designs based on a sagittal single radius.


We aimed to compare postoperative knee performance through the Knee Society scores, flexor and extensor muscle function, stability, and gait of a series of patients receiving a posterior stabilized, cemented TKA, with a single-radius femoral design.


We compared a series of patients treated with a single-radius femoral design TKA to a simultaneous series of patients receiving a multiradius femoral design. Both groups were similar in demographics and preoperative Knee Society scores. The clinical pathways were identical. Outcome assessment included Knee Society scores, isokinetic assessment, stabilometry, and gait cycle analysis.


We observed higher functional Knee Society scores (86.6 ± 1.89 versus 80.3 ± 1.90), fewer physiotherapy sessions (19.9 ± 4.65 versus 22.2 ± 3.34), and less time with two crutches (3.5 ± 1.2 versus 5.2 ± 1.04 weeks) for patients receiving the single-radius design. Isokinetic evaluation showed decreased flexion peak torque (40.3 ± 7.9 versus 48.7 ± 9.6), increased extension peak torque (77.2 ± 16.1 versus 69.1 ± 14.4), and lower flexor/extensor ratio (0.5 ± 0.08 versus 0.7 ± 0.1) in patients with the single-radius design. Stabilometry showing less relative oscillation, and gait cycle indirectly confirmed better support in the limb with the single-radius design.


The studied single-radius femoral design showed better functional short-term outcome and better extensor performance.

Level of Evidence

Level III, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.


Gait Cycle Peak Torque Anterior Knee Pain Knee Society Score Extensor Mechanism 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank the physiotherapists in the Rehabilitation Department, Fundación Jiménez Díaz, for their assistance.


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Copyright information

© The Association of Bone and Joint Surgeons® 2009

Authors and Affiliations

  • Enrique Gómez-Barrena
    • 1
    Email author
  • Carmelo Fernandez-García
    • 2
  • Almudena Fernandez-Bravo
    • 2
  • Raquel Cutillas-Ruiz
    • 2
  • Gloria Bermejo-Fernandez
    • 2
  1. 1.Department of Orthopaedic Surgery, Fundación Jiménez Díaz HospitalUniversidad Autónoma de MadridMadridSpain
  2. 2.Department of Rehabilitation, Fundación Jiménez Díaz HospitalUniversidad Autónoma de MadridMadridSpain

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