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Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 20, Issue 6, pp 1104–1109 | Cite as

In vivo sagittal plane kinematics of the FPV patellofemoral replacement

  • A. P. Monk
  • B. H. van Duren
  • H. Pandit
  • D. Shakespeare
  • D. W. Murray
  • H. S. Gill
Knee

Abstract

Purpose

Isolated symptomatic patellofemoral osteoarthritis has been reported in 2% of men and 8% of women older than the age of 55 years in the community. With the development of improved designs and surgical techniques, interest in the use of patellofemoral replacement has increased. The primary aim of the newer generation of patellofemoral replacement implant designs has been to more closely reproduce normal knee kinematics. This study compares the functional sagittal plane in vivo kinematics of a contemporary patellofemoral prosthesis, the FPV, with normal knee kinematics using the patella tendon angle and patella flexion angle relationships with the knee flexion angle.

Methods

The in vivo kinematics for a group of 8 patients (15 knees) with patellofemoral replacement and 22 normal subjects was measured for both a step-up and a lunge exercise using an established fluoroscopic method.

Results

The patella tendon angle characteristics of the implanted knees were similar to those of the normal knees for the step-up exercise with a significant difference only observed at 50° knee flexion angle. For the lunge exercise, the patella tendon angle for the implanted knee was consistently lower than that measured for the normal knee. Overall the subjects had excellent clinical scores post-patellofemoral replacement showing a significant improvement from their pre-operative scores.

Conclusion

The kinematics of the FPV implant was closer to normal than those of total knee implants; however, there were still differences from the normal knees.

Level of evidence

III.

Keywords

Patellofemoral replacement Kinematics Functional Outcome 

Notes

Acknowledgments

Financial support has been received from the NIHR Biomedical Research Unit into Musculoskeletal Disease, Nuffield Orthopaedic Centre and University of Oxford.

Conflict of interest

The institution of one or more of the authors has received research funds from a commercial source.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • A. P. Monk
    • 1
  • B. H. van Duren
    • 1
    • 2
  • H. Pandit
    • 1
    • 2
  • D. Shakespeare
    • 3
  • D. W. Murray
    • 1
    • 4
  • H. S. Gill
    • 1
  1. 1.Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal SciencesUniversity of OxfordOxfordUK
  2. 2.Department of Engineering ScienceUniversity of OxfordOxfordUK
  3. 3.Nuffield Health Warwickshire HospitalLeamington Spa WarwickshireUK
  4. 4.Nuffield Orthopaedic CentreOxfordUK

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