Differences in the stress distribution in the distal femur between patellofemoral joint replacement and total knee replacement: a finite element study

Journal of Orthopaedic Surgery and Research

Nico Verdonschot³  Luc Labey⁴  Gian Luca Gervasi²  Bernardo Innocenti⁴  Hans-Peter W van Jonbergen¹ 

[1] Department of Orthopedic Surgery, Deventer Hospital, PO Box 5001, 7400 GC, Deventer, The Netherlands;Department of Mechanical and Industrial Technology, University of Florence, Florence, Italy;Department of Orthopaedic Surgery and Orthopaedic Research Laboratory, Radboud University Nijmegen Medical Center, PO Box 9101, 6500 HB, Nijmegen, The Netherlands;European Centre for Knee Research, Smith&Nephew, Technologielaan 11 Bis, 3001, Leuven, Belgium

关键词: Squat movement;    Stress shielding;    Finite element analysis;    Knee prosthesis;    Patellofemoral joint replacement;   

Others  :  817888
DOI  :  10.1186/1749-799X-7-28

 received in 2011-11-04, accepted in 2012-06-01,  发布年份 2012

【 摘 要 】

Background

Patellofemoral joint replacement is a successful treatment option for isolated patellofemoral osteoarthritis. However, results of later conversion to total knee replacement may be compromised by periprosthetic bone loss. Previous clinical studies have demonstrated a decrease in distal femoral bone mineral density after patellofemoral joint replacement. It is unclear whether this is due to periprosthetic stress shielding. The main objective of the current study was to evaluate the stress shielding effect of prosthetic replacement with 2 different patellofemoral prosthetic designs and with a total knee prosthesis.

Methods

We developed a finite element model of an intact patellofemoral joint, and finite element models of patellofemoral joint replacement with a Journey PFJ prosthesis, a Richards II prosthesis, and a Genesis II total knee prosthesis. For each of these 4 finite element models, the average Von Mises stress in 2 clinically relevant regions of interest were evaluated during a simulated squatting movement until 120 degrees of flexion.

Results

During deep knee flexion, in the anterior region of interest, the average Von Mises stress with the Journey PFJ design was comparable to the physiological knee, while reduced by almost 25% for both the Richards II design and the Genesis II total knee joint replacement design. The average Von Mises stress in the supracondylar region of interest was similar for both patellofemoral prosthetic designs and the physiological model, with slightly lower stress for the Genesis II design.

Conclusions

Patellofemoral joint replacement results in periprosthetic stress-shielding, although to a smaller degree than in total knee replacement. Specific patellofemoral prosthetic design properties may result in differences in femoral stress shielding.

【 授权许可】

   
2012 van Jonbergen et al.; licensee BioMed Central Ltd.

【 图 表 】

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