الفهرس 
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Abstract
Radiological and magnetic resonance studies were used to compare morphometry and morphology of the coccyx in normal subjects and patients with coccydynia.
In this study the youngest patient was 19 years old and the eldest patient was 50 years old. sixteen (53.3%) males and 14 (46.7%) females.
Comparing controls with patients with coccydynia had significant more sacrococcygeal joint fusion (P= 0.02), more coccygeal type 2 (P= 0.003), intercoccygeal subluxation (P=0.007), bony spicule (P= 0.01), highly significant less sacrococcygeal curvature index (P < 0.001), significant less coccygeal curvature index (P = 0.04), highly significant more sacrococcygeal curved length (P < 0.001), lower intercoccygeal angle (P =0.04) and less sacral angle (P = 0.01). There was no significant difference in the number of coccygeal segments (P= 0.87) and in either sex (P=1.00 and= 0.11 in females and males, respectively), intercoccygeal joint fusion (P= 0.24) and in either sex (P= 0.13and= 0.47in females and males, respectively), coccygeal straight length (P=0.06), coccygeal curved length (p= 0.07), straight sacral lengths (p=0.07). Curved sacral length (p= 0.15) and straight sacrococcygeal length (p= 0.26).
Compared with female controls, female patients had significant more coccygeal type 2 (P = 0.05), lower prevalence sacrococcygeal joint fusion (P = .05), higher prevalence bony spicule (P = 0.05), less coccygeal curvature index (P = 0.04), higher sacrococcygeal curved length (P= 0.002), lower sacrococcygeal curvature index (P= 0.009) and less sacral angle (P= 0.04).