Table 2.

Distribution of patient population according to doubtful criteria.

Criteria for Doubtful Interpretation	n. of Patients	Patients with BMS
A. Small, not significant increase of activity in the suspected region at late images	36	30
B. Increase of bone marrow activity over time, that does not allow easy visualization of peri-prosthetic or bone activity	11	9
C. Small increase of extent of uptake in the suspected region at late images, without significant increase of activity	4	4
D. Soft tissue infection that does not allow to clearly evaluate the bone	6	5
E. Small increase of activity over time, in the suspected region, but similar increase also in bone marrow	2	2
F. Unmodified activity over time in the suspected region with clear decrease of bone marrow and background activity	7	6
	tot: 66	tot: 56