Knee-joint simulator, penetration

Penetration of Metallic Femoral Components into Polymeric Tibial Components Observed in a Knee Joint Simulator... 

A knee joint simulator designed to evaluate the mechanical and tribological characteristics of total replacement knee joints will be described. Measurements of penetrations of metallic femoral components into the polymeric tibial components by means of dual index holographic contouring will be presented and the findings compared with observations from detailed studies of wear in well-controlled laboratory machines and the limited evidence of in-vivo performance of replacement knee joints. 

A knee joint simulator was designed and built in the bioengineering laboratory at Leeds in the late 1970 s to enable the mechanical and tribological characteristics of current and projected knee joint replacements tp.he assessed. The simulator has been described by Dowson et al and it is shown in Figure 1. Realistic load and motion cycles are applied to the knee joints to simulate any desired activity, but usually walking, and the penetration of the metallic femoral components into the polymeric tibial components after a large number of cycles can then be used to assess the life of the joints. Furthermore, the penetrations recorded, which include both wear and creep, can be related to results of laboratory wear studies of the behaviour of UHMWPE and to the in-vivo performance of total replacement knee joints. The simulator is therefore an Important machine in both the pragmatic and fundamental aspects of total replacement knee join development. 

Dual index holographic contouring has been used to record the nature and the extent of femoral penetration into worn polymeric tibial components tested on the knee joint simulator. The system is briefly described and results are presented for two different forms of prostheses., ... 

Dowson D, Gillis BJ, Atkinson JR. Penetration of metallic femoral components into polymeric tibial components observed in a knee joint simulator. American Chemical Society Symposium Series No. 287, Polymer Wear Contr 1985 p. 215-28. 

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