The correlation between volumetric bone mineral density and morphological parameters of the proximal femur and clinical outcomes in ankylosing spondylitis patients with hip involvement

Table 2 Radiographic parameters of AS patients on different stages of hip involvement

Parameters	Total AS patients (n = 65)	Group A (n = 39)	Group B (n = 26)	P value
CFI	3.52 ± 0.79 (1.70–5.77)	3.53 ± 0.70 (2.12–4.96)	3.50 ± 0.92 (1.70–5.77)	0.698
MCFI	2.19 ± 0.29 (1.33–3.04)	2.20 ± 0.31 (1.33–3.04)	2.19 ± 0.26 (1.76–2.66)	0.779
CCR	0.48 ± 0.11 (0.30–0.86)	0.48 ± 0.10 (0.32–0.74)	0.48 ± 0.12 (0.30–0.86)	0.883
CBR	0.46 ± 0.08 (0.31–0.65)	0.45 ± 0.07 (0.31–0.58)	0.48 ± 0.09 (0.32–0.65)	0.194

Group A represents the hips with absent, minimal or mild radiographic involvement (BASRI-Hip score = 0 or 1 or 2) and Group B represents the hips with moderate to severe radiographic involvement (BASRI-Hip score = 3 or 4)
Abbreviations: AS Ankylosing spondylitis, CFI Canal flare index, MCFI Metaphyseal canal flare index, CCR Canal to calcar ratio, CBR Canal bone ratio

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