Fig. 4
Kaplan-Meier survival curves describing survival free from prosthesis loosening. Left, femoral component. CFR0.7 > 2 cm, CFR0.7 > 4 cm, and CFR0.85 were all associated with less loosening. Right, tibial component. Only CFR0.85 was associated with less loosening CFR (canal filling ratio) was calculated as the ratio between the stem width and the medullary canal width. CFRx > y indicates stem length > y for which CFR is larger than x.