Table 5.

Multivariate logistic regression model for the development of patellar crepitus

Parameter		Odds ratio	95% confidence level	p value
Previous surgeries	1	6.2	5.9–6.4	0.0009
	> 1	18.2	18.0–18.3	< 0.0001
Femoral component size < 3		4.6	4.4–4.7	0.0253
Polyethylene bearing thickness > 12.5		12.4	12.2–12.6	0.0015
Preoperative patellar tendon length (mm)		0.9	0.8–1.0	0.0098
Femoral component flexion (°)		1.2	1.0–1.5	0.0282
Change in posterior condylar offset (mm)		1.5	1.2–1.9	< 0.0001