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Osteochondrosis – Primary Epiphyseal (Articular/Subchondral) Lesion Can Heal Or Can Progress

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Osteochondrosis – Primary Epiphyseal (Articular/Subchondral) Lesion Can Heal Or Can Progress 60 120 180 1 distal humeral condyles 2 medial epicondyle 3 proximal radial epiphysis 4 anconeal process Lab Ret study N=1018 . Normal . Affected . Total 688 (67.6%) . Total 330 (32.4%) . Male 230 (62.2%) . Male 140 (37.8%) . Female 458 (70.7%) . Female 190 (29.3%) Affected dogs N=330 1affected site - 250 (75.7%) 2 affected sites - 68 (20.6%) 3 affected sites - 12 (3.6%) immature skeletal diseases denis novak technique for skeletal radiography tissue < 12 cm “non-grid” (“table-top”) technique “high detail” system radiation safety diagnosis X – rays examination Ultrasound CT bilateral lesions - clinical signs ? unilateral present > one type of lesion 2ry arthrosis Common Osteochondrosis – primary epiphyseal (articular/subchondral) lesion can heal or can progress Osteochondritis dissecans – free articular fragment will progress Arthrosis Osteochondrosis talus / tarsus Lumbosacral OCD Lumbosacral OCD Inflammatory diseases Panosteitis – non infectious Hypertrophic osteodystrophy (HOD) – perhaps infectious Osteomyelitis - infectious Panosteitis New medullary bone Polyostotic Multiple lesions in one bone Symmetrical or nonsymmetrical Sclerotic pattern B I L A T E R A L periosteal new bone forms with chronicity Cross sections of a tibia different locations Hypertrophic osteodystrophy (HOD) Dogs are systemically ill, febrile, anorectic, reluctant to walk most will recover Radiographic changes of HOD . Polyostotic . Metaphyseal . Symmetrical . Changes of lesion Early Mid Late lytic “plates” in acute case HOD - 4 m ret – lesions are present in all long bones - mid cuff of ossified tissue is separated from the bone as it forms - mid to late rapid progress of lesion Treatment: Supportive Medical TLC Complicated cases can be fatal! Osteonecrosis of the femoral head Legg Calve Perthes Small breeds A developmental disorder Occurs 3-11 months of age Male = female Usualy unilateral disease Radiographic changes LCP Early stage Middle stage Later stage the articular cartilage remains relatively intact the cavity formation within the necrotic bone Ulna growth Trauma to distal growth plate Retained cartilage core Chondrodystrophic breeds abnormality Normal distal ulna Normal - plate-like distal radial physis, inverted cone shaped distal ulna physis Retained cartilage core -Distal ulnar metaphysis remains cartilaginous Retained cartilage core Lucent cone-shaped core Usually bilateral Can delay ulnar growth A cause of “radius curvus” Small no clinical importance Error in growth of physeal plates idiopathic/traumatic Delayed growth -entire or only part of the plate Growth can temporally stop Premature closure of plate Injury to entire or only part of the plate Premature closure of distal ulna with ulnar shortening and secondary radial bowing Premature closure - ulna - 10 m GDD Premature closure of the distal radius with elbow subluxation Incongruity of elbow joint resulting from closure of distal radial growth plate Bone infection Osteomyelitis Osteitis Myelitis Periostitis Bone infection hematogenous monostotic/polyostotic 2ndry infectious arthritis 2ndry puncture wound/surgery 2ndry to soft tissue infection Radiographic changes Usually destructive Minimal cortical destruction More medullary destruction Fungal disease is more productive Reactive new bone forms Usually with a pattern and mature appearance Sequestrum may form + involucrum other diseases... transitional vertebrae patella luxation malformation metabolic ... transitional lumbosacral vertebrae patellar luxation congenital “Life is movement and movement is life” .
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