Reliability of the pronator quadratus fat pad sign to predict the severity of distal radius fractures

Table 1 Distribution (n = 44) of distal radius fractures according to the Frykman classification

Frykman-classification
I	3
II	0
III	10
IV	5
V	2
VI	2
VII	9
VIII	13

Table 2 Thickness of the pronator quadratus complex measured on lateral conventional radiographs and sagital reconstructions of a computed tomography

	Total (n = 89)	With fracture	Without fracture
		(n = 44)	(n = 45)
CR (mm)	7.5 ± 2.8	8.8 ± 2.9	6.2 ± 1.8
CT (mm)	9.4 ± 3.0	10.9 ± 3.1	7.8 ± 2.0
Correlation	0.795	0.74	0.695
coefficient

CR: Conventional radiographs; CT: Computed tomography.

Table 3 Frequency of a positive and negative fat pad sign depending on the absence or presence of a fracture

	CR pronator quadratus fat pad sign
Radius fracture		Positive	Negative	Total
	Yes	21	23	44
	No	2	43	45
	Total	23	66	89

Table 4 Sensitivity and specificity of the positive fat pad sign for detection of a fracture

	Sensitivity	Specificity	Positive	Negative
			predictive value	predictive value
Positive fat pad	48.00%	96.00%	91.00%	65.00%
sign for detection
of a fracture