Changes

**Poor conformation

**Poor conformation

**Disruption of blood supply to one side of bone

**Disruption of blood supply to one side of bone

**Secondary to [[Bones - developmental#Physitis|physitis in horses]]

**Secondary to [[Bones Developmental - Pathology#Physitis|physitis in horses]]

*Usually resolves spontaneously in one to two weeks of life

*Usually resolves spontaneously in one to two weeks of life

*More severe cases exceding compensatory capabilities will persisist

*More severe cases exceding compensatory capabilities will persisist

*In horses

*In horses

*Often associated with [[Bones - developmental#Angular limb deformity|angular limb deformity]]

*Often associated with [[Bones Developmental - Pathology#Angular limb deformity|angular limb deformity]]

*Also called '''epiphysitis''' and '''physeal dysplasia'''  

*Also called '''epiphysitis''' and '''physeal dysplasia'''  

*Problem of [[Bones - normal#Bone development|endochondral ossification]]

*Problem of [[Bones - normal#Bone development|endochondral ossification]]

**Excessive activity

**Excessive activity

**Growth spurts

**Growth spurts

*Histologically: (appearance similar to [[Bones - developmental#Angular limb deformity|angular limb deformity]])

*Histologically: (appearance similar to [[Bones Developmental - Pathology#Angular limb deformity|angular limb deformity]])

**Lateral aspect of radius

**Lateral aspect of radius

***Thickened metaphyseal part of physeal cartilage

***Thickened metaphyseal part of physeal cartilage

***Tension

***Tension

***-> Transverse [[Bones - fractures|fractures]] and repair

***-> Transverse [[Bones - fractures|fractures]] and repair

**Laxity of periarticular attachements in young foals allows [[Bones - developmental#Angular limb deformity|angular limb deformity]]; not occuring in older foals and young horses

**Laxity of periarticular attachements in young foals allows [[Bones Developmental - Pathology#Angular limb deformity|angular limb deformity]]; not occuring in older foals and young horses

**(Sustained trauma produces similar lesions)

**(Sustained trauma produces similar lesions)

[http://www.omafra.gov.on.ca/english/livestock/horses/facts/info_congenital.htm#musculoskeletal Developmental abnormalities]

[http://www.omafra.gov.on.ca/english/livestock/horses/facts/info_congenital.htm#musculoskeletal Developmental abnormalities]