Table 2.

Published definitions of stiffness

Study	Criteria
Kim et al. [25]	FFC > 15° or flexion < 75°
Parvizi et al. [35]	ROM < 90° or manipulation required
Gandhi et al. [15]	Flexion < 90° at 1 year
Yercan et al. [50]	FFC > 10° or flexion < 95° at 6 weeks
Scranton [40]	Flexion < 90°

FFC = fixed flexion contracture.