Reproducibility and sensitivity to change of various methods to measure joint space width in osteoarthritis of the hip: a double reading of three different radiographic views taken with a three-year interval

Table 7 Proportion of patients considered to be progressors

View	Observer	Patients with ≥ 0.3 mm change between M0 and M36	Patients with ≥ 0.5 mm change between M0 and M36
Pelvic	1	52%	34%
	2	48%	40%
	Both	40%	28%
Hip AP	1	52%	34%
	2	54%	40%
	Both	46%	32%
Oblique	1	56%	46%
	2	52%	38%
	Both	46%	34%

Shown are the proportions of patients considered to be progressors, using two different smallest detectable differences (SDDs) as cutoff values for defining progression (0.3 mm and 0.5 mm) for the two readers and three views. AP, anteroposterior.

ISSN: 1478-6362