The suitability of an uncemented hydroxyapatite coated (HAC) hip hemiarthroplasty stem for intra-capsular femoral neck fractures in osteoporotic elderly patients: the Metaphyseal-Diaphyseal index, a solution to preventing intra-operative periprosthetic fracture

Table 1 Risk factors for Intra-operative fracture

Risk Factors	Intra-operative Fracture (n = 71)	No Fracture (n = 489)	Uni-ANOVA			Multi-Regression Analysis
			OR	Chi ²	F (p)	OR	Chi ²	95%CI	CST
Age (yrs +/-sd)	83 +/- 6.7	81 +/- 7.5	-	0.906	0.66, p = 0.91	1.5	0.135	0.004 (0.001-0.008)	0.98
Sex (Female %)	81.7%	82%	1.09 (0.57-2.08)	0.707	0.30, p = 0.81	0.05	0.933	0.002 (0.08-0.893)	0.93
Time to operation (Days +/- SEM)	1 +/- 3.3	1 +/- 3.3	-	0.328	0.07, p = 0.7	0.8	0.875	0.005 (0.001-0.001)	0.99
Operator experience (Median, yrs +/- SEM)	8.31 +/- 6.9	7.7 +/- 6.3	-	0.455	0.44, p = 0.7	0.8	0.453	0.002 (0.003-0.007)	0.99
Cemented	9 (12.7%)	144	3.62* (1.61-8.10)	0.001*	11.7* , P < 0.001	3.4*	0.001*	0.133 (0.056-0.211)	0.98*
Uncemented	62 (87.3%)*	345

OR = Odds Ratio. F = Uni-ANOVA statistic. P < 0.05 * considered significant.
CST = Colinearity Statistical Tolerance: (0-1). The higher the value, the less likely a Type I error has been committed.
The table confirms that only the Uncemented stems are a risk factor for intra-operative fracture

ISSN: 1749-799X