Bi-iliac distance - Dog - axes and angles - Pelvis - vet-Anatomy
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Bi-iliac distance

Bi-iliac distance

  • Synonym: Distance between iliac tuber coxae
  • Acronym: BID

Definition

Stephan Mahler

The bi-iliac distance is a pelvic measurement used to assess the anatomy of the pelvic area, particularly in the context of obstructive dystocia and constipation. It is determined from a ventrodorsal radiograph or multiplanar reconstructed CT images of the pelvis.

The bi-iliac distance is the horizontal distance between the two coxal tuberosities. It represents the distance between the most lateral points of the outer edge of the iliac crest.

The mean values reported in the literature for the bi-iliac distance are :

  • In Boston terrier with normal parturition and dystocia respectively : 7.1 +/- 0.14 cm and 6.9 +/- 0.17 cm

  • In Scottish terrier with normal parturition (9.5 +/- 0.9 kg) and dystocia (9.8 +/- 0.8 kg) respectively : 7.8 +/- 0.12 cm and 7.4 +/- 0.12 cm

  • In English bulldogs (range 18.1 to 30.8 kg, mean 23.56 kg) from both genders : 7.7 +/- 0.4 cm

  • In non-brachycephalic dogs of various breeds and crossbred dogs (range 18 to 31.1 kg, mean 26.62 kg) from both genders (18-30 kg) : 8.4 +/- 0.6 cm

References

  • Eneroth et al. (1999). Radiographic pelvimetry for assessment of dystocia in bitches: a clinical studv in two terrier breeds. Journal of Small Anmal Practice. J Small Anim Pract;40.257-264. DOI: 10.1111/j.1748-5827.1999.tb03076.x

  • Dobak, Tetyda P.; Voorhout, George; Vernooij, Johannes C.M.; Boroffka, Susanne A.E.B. (2018). Computed tomographic pelvimetry in English bulldogs. Theriogenology, (), S0093691X18302437–. doi:10.1016/j.theriogenology.2018.05.025

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