Agenesis and Dysgenesis of the Navicular Bone as Cause of Lameness and Malalignment in Two Foals

Schenzel, Svenja; Rohde, Christin; Fugazzola, Maria

doi:10.1016/j.jevs.2020.103224

Cited by 1 publication

(2 citation statements)

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“…Equine congenital malformations that affect the limbs are very rare, representing only 1.6% of congenital abnormalities (Bertone & Aanes, 1984; Jordana et al., 2016 ; Schenzel et al., 2020 ; Smith et al., 1986 ). Hypoplasia or aplasia have been previously described to affect the navicular bone, phalangeal joint and metacarpophalangeal joint (Bertone & Aanes, 1984; Jordana et al., 2016 ; Schenzel et al., 2020 ; Smith et al., 1986 ). Congenital patellar abnormalities primarily affect miniature horses and are rarely reported in foals.…”

Section: Discussionmentioning

confidence: 99%

“…Polydactyly occurs most frequently and typically affects the forelimbs (Smith et al., 1986 ). Absent, aplastic, or dysplastic bones are rare, and only cases affecting the phalanges and/or distal sesamoids have been reported (Bertone & Aanes, 1984; Jordana et al., 2016 ; Schenzel et al., 2020 ; Smith et al., 1986 ). Congenital patellar aplasia or hypoplasia is a rare disorder in humans that usually does not cause significant knee dysfunction and is often accompanied by other congenital abnormalities (Jerome et al., 2008 ; Jerome et al., 2009 ; Sferopoulos, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

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Bilateral patellar aplasia in a foal

Ludwig

Hallowell

Womble

et al. 2023

Veterinary Medicine & Sci

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A 2-day-old Cleveland Bay colt was referred to the Equine Emergency Service of the Farm Animal and Equine Veterinary Medical Center at North Carolina State University's College of Veterinary Medicine for evaluation of decreased nursing behaviour and right hindlimb lameness of 2 days' duration. When assisted to stand, the foal was unable to extend either hindlimb or bear weight on the hindlimbs, the right patella was luxated laterally and unable to be reduced, and the foal assumed a crouched position.Stifle radiographs revealed minimal, heterogeneous, ill-defined ossification of both patellae. Due to the severity of the musculoskeletal defects, humane euthanasia was elected. Post-mortem examination identified a congenital malformation of both patella bones with failure of ossification and cardiac changes suggestive of right atrioventricular valve dysplasia. Histology of the patellae showed no evidence of osteoid deposition or ossification. To our knowledge, bilateral congenital patellar aplasia has not been previously described in foals.

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