Changes

**Joint laxity / acetabular dysplasia

**Joint laxity / acetabular dysplasia

**-> Flattened femoral head +/- mild or severe periarticular [[Musculoskeletal Terminology - Pathology|osteophyte]] formation

**-> Flattened femoral head +/- mild or severe periarticular [[Musculoskeletal Terminology - Pathology|osteophyte]] formation

**-> Thickening of femoral head + degeneration of [[Joints - normal#Articular cartilage|articular cartilage]]

**-> Thickening of femoral head + degeneration of [[Joints - Anatomy & Physiology#Articular cartilage|articular cartilage]]

**[[Musculoskeletal Terminology - Pathology|Eburnation]]

**[[Musculoskeletal Terminology - Pathology|Eburnation]]

*Predisposes to [[Joints Degenerative - Pathology#Degenerative joint disease (DJD)|DJD]]

*Predisposes to [[Joints Degenerative - Pathology#Degenerative joint disease (DJD)|DJD]]

*Defect in cartilage growth (i.e. '''dyschondroplasia''')

*Defect in cartilage growth (i.e. '''dyschondroplasia''')

*In growing animals: large breeds of dogs (4-8 months), pigs (5-7 months) and horses (weeks - 2 years)

*In growing animals: large breeds of dogs (4-8 months), pigs (5-7 months) and horses (weeks - 2 years)

*Involves both the [[Bones - normal#Physis (Growth plate)|growth plate]] and the immature [[Joints - normal#Articular cartilage|joint cartilage]]

*Involves both the [[Bones - normal#Physis (Growth plate)|growth plate]] and the immature [[Joints - Anatomy & Physiology#Articular cartilage|joint cartilage]]

*Multifactorial:  

*Multifactorial:  

**Trauma

**Trauma

****Lesion filled with [[General Pathology - Chronic Inflammation#Granulation tissue|granulation tissue]] (fibroplasia)

****Lesion filled with [[General Pathology - Chronic Inflammation#Granulation tissue|granulation tissue]] (fibroplasia)

****Surrounding thickened bone spicules

****Surrounding thickened bone spicules

****Cap of thickened [[Joints - normal#Articular cartilage|articular cartilage]] over the defect

****Cap of thickened [[Joints - Anatomy & Physiology#Articular cartilage|articular cartilage]] over the defect

****-> May fragment - joint mice

****-> May fragment - joint mice

****Calcified cartilage fragments may be in the posterior pocket of joint capsule

****Calcified cartilage fragments may be in the posterior pocket of joint capsule