Evaluating the necessity of bone augmentation for distal radius fracture fixed with a volar locking plate: a retrospective study

Table 3 Differences in radiographic parameters immediately after surgery and at 6-month follow-up

	Non-augmentation group, GP1 (n = 88)					Augmentation group, GP2 (n = 17)					p-value†	p-value‡
	After surgery		At 6 months		p-value	After surgery		At 6 months		p-value	p-value†	p-value‡
For all patients with distal radius fracture
*X/Y	3.56	(3.42, 3.74)	3.46	(3.34, 3.61)	< 0.001**	3.54	(3.36, 3.61)	3.42	(3.30, 3.53)	0.001**	0.399	0.289
Volar tilting	11.00	(9.00, 13.00)	11.00	(8.00, 13.00)	0.366	11.00	(7.00, 12.50)	10.00	(7.00, 13.00)	0.749	0.240	0.281
Radial inclination	22.00	(19.00, 24.00)	22.00	(20.00, 24.00)	0.171	22.00	(19.0, 24.00)	21.00	(19.50, 22.50)	0.233	0.730	0.278
Radial height/R^a	0.57	(0.44, 0.66)	0.54	(0.39, 0.64)	< 0.001**	0.52	(0.43, 0.57)	0.45	(0.37, 0.57)	0.039*	0.171	0.196
For patients with comminuted fractures
GP1, (n = 38)						GP2 (n = 16)
X/Y	3.60	(3.48, 3.75)	3.54	(3.38, 3.64)	< 0.001**	3.52	(3.35, 3.61)	3.42	(3.29, 3.54)	0.001**	0.094	0.099
Volar tilting	11.00	(8.75, 13.00)	10.50	(8.00, 12.00)	0.098	11.00	(7.25, 12.75)	10.00	(7.00, 13.00)	0.497	0.402	0.621
Radial inclination	22.00	(19.00, 24.25)	22.00	(20.00, 24.25)	0.697	21.50	(19.00, 23.00)	21.00	(19.25, 22.00)	0.431	0.458	0.282
Radial height/R	0.59	(0.43, 0.65)	0.54	(0.39, 0.65)	0.002**	0.52	(0.46, 0.57)	0.46	(0.41, 0.57)	0.063	0.215	0.384

Mann-Whitney U test, median (interquartile range). Wilcoxon signed rank, *p < 0.05, **p < 0.01
†After surgery: non-augmentation vs. augmentation
‡At 6 months: non-augmentation vs. augmentation
*X was defined as the distance of the tip of the dorsal cortex to the 2nd distal locking screw
Y was defined as the distance from the distal 1st to the distal 2nd locking screw, which should be fixed between the images immediately and at 6 months after surgery. The ratio X/Y for statistical analysis can eliminate magnification error
^a R was defined as the distance from the distal 1st locking hole to the distal 2nd locking hole on the anteroposterior (AP) view, which should be fixed between the images immediately and at 6 months after surgery
The ratio Radial Height/R for statistical analysis can eliminate magnification error

ISSN: 1471-2474