Diagonal conjugate - Dog - axes and angles - Pelvis - vet-Anatomy
View the module

Diagonal conjugate

Conjugata diagonalis

  • Synonym: Caudal conjugate
  • Acronym: CD

Definition

Stephan Mahler

The diagonal conjugate 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 laterolateral radiograph or multiplanar reconstructed CT images of the pelvis.

The diagonal conjugate is the distance between promontory and caudal end of pelvic symphysis.

The mean values reported in the literature for the diagonal conjugate are :

  • In Boston terrier with normal parturition (7.5 +/- 1.1 kg) and dystocia (7.5 +/- 0.8 kg) respectively : 6.8 +/- 0.08 cm and 6.8 +/- 0.15 cm

  • In Scottish terrier with normal parturition (9.5 +/- 0.9 kg) and dystocia (9.8 +/- 0.8 kg) respectively : 6.8 +/- 0.07 cm and 6.5 +/- 0.07 cm

  • In English bulldogs with normal parturition (21.25 +/- 0.91 kg) and that had given birth through caesarean section respectively (25.16 +/- 1.44 kg) : 10.23 +/- 0.4 cm and 10.15+/- 0.56 cm

  • In English bulldogs (range 18.1 to 30.8 kg, mean 23.56 kg) from both genders : 9.1 +/- 0.5 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) : 10.6 +/- 0.8 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

  • Horňáková et al. (2023). Radiographic pelvimetry in relation to dystocia in Bulldogs. Folia Veterinaria 67;3:33-38. DOI: 10.2478/fv-2023-0025

  • 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

Gallery