Clinical Outcome and Biomechanical Analysis of Dynamic Hip Screw Combined with Derotation Screw in Treating Displaced Femoral Neck Fractures Based on Different Reduction Qualities in Young Patients (≤65 Years of Age)

Table 3

Comparison of postoperative complications and clinical outcomes.

Variables	Positive buttress reduction group ()	Anatomical reduction group ()	value
Complications
Varus change of the FNSA (degree)			0.003
Femoral neck shortening (mm)			<0.001
Femoral head necrosis	2 (6.5)	4 (10.8)	0.681
Fracture nonunion	0 (0.0)	2 (5.4)	0.496
Mechanical failure	1 (3.2)	3 (8.1)	0.620
VAS			0.222
Harris hip score			0.320
Excellent	8 (25.8)	6 (16.2)
Good	18 (58.1)	18 (48.6)
Fair	4 (12.9)	9 (24.3)
Poor	1 (3.2)	4 (10.8)

Abbreviations: FNSA: femoral neck-shaft angle; VAS: visual analogue scale. Statistically significant difference.