Decreased complications but a distinctive fixation loosening mechanism of fully threaded headless cannulated screw fixation for femoral neck fractures in young adults

Table 5 Binary logistic regression models

Variables	Femoral neck shortening (< 10 mm) (FTHCS versus PTS)			Fixation failure (FTHCS versus PTS)				Nonunion (FTHCS versus PTS)			ANFH (FTHCS versus PTS)
Variables	OR	95% CI	p value	OR		95% CI	p value	OR	95% CI	p value	OR	95% CI	p value
Total	0.38	0.15–0.93	0.035	0.26		0.10–0.69	0.007	0.34	0.12–1.01	0.052	0.82	0.24–2.82	0.754
Garden classification
I–II	0.18	0.03–0.92	0.039	0.15		0.02–1.32	0.087	–	–	0.998	2.24	0.19–26.23	0.521
III–IV	0.59	0.19–1.81	0.353	0.30		0.10–0.91	0.034	0.42	0.13–1.34	0.142	0.55	0.12–2.43	0.428
Pauwels classification
I–II	0.21	0.05–0.85	0.029	0.50		0.08–2.97	0.446	–	–	0.998	2.23	0.19–26.06	0.522
III	0.65	0.19–2.21	0.486	0.19		0.06–0.62	0.006	0.42	0.13–1.33	0.140	0.55	0.12–2.43	0.427
VN angle
< 15°	0.14	0.03–0.68	0.015		0.14	0.02–1.19	0.072	0.14	0.02–1.19	0.072	1.17	0.16–8.85	0.877
≥ 15°	0.87	0.26–2.95	0.821		0.29	0.09–0.91	0.035	0.55	0.14–2.11	0.384	0.64	0.13–3.06	0.640

FTHCS Fully threaded headless cannulated screw, PTS Partial threaded cannulated screw, VN Vertical of the neck axis, ANFH Avascular necrosis of femoral head

ISSN: 1749-799X