The PEEK performance: Analysis of the primary fixation of a novel cementless knee implant

This thesis investigated a new type of knee prosthesis made of a high-grade polymer. This knee prosthesis could be used in patients with metal allergy. Moreover, because this polymer has similar properties to bone, this knee prosthesis may prevent loosening, which will lead to fewer reoperations and better long-term outcomes. 
This knee prosthesis was investigated by analysing the effect of design- and patient-related factors on fixation using micromotions. 
The micromotions of the polymer knee prosthesis were generally higher than those of the currently used metal knee prosthesis. However, the micromotions of the majority of the polymer knee prostheses remained below the critical thresholds that allow sufficient bone ingrowth. These findings highlighted the complicated interplay between design- and patient-related factors that can affect fixation. Mapping these factors will help in the adequate design of cementless polymer knee prostheses.