Abstract
AbstractA 10-year-old Labrador Retriever was referred for persistent lameness due to chronic right shoulder pain, unresponsive to various pain management therapies. Radiographs indicated signs of severe degenerative changes in the joint. Synovial fluid analysis was not diagnostic. Septic arthritis was suspected based on computed tomography and clinical signs. Arthroscopy allowed joint exploration, tissue biopsies, and copious joint lavage. Trichophyton spp. proliferation was identified on antimicrobial culture and histological analysis on samples obtained during arthroscopy. Oral griseofulvin therapy was initiated. Two months later, the referring veterinarian decided to interrupt the treatment after a negative synovial culture despite persistent lameness. Euthanasia was elected upon after pain also appeared on the tarsus; a post-mortem exam was not authorized by the owner. The origin of the infection remains unclear as this patient had no skin lesions and its immunological status was unknown. However, dermatophytosis has been reported in healthy dogs without skin lesions. To the author's knowledge, this is the first report of an osteoarticular infection with a dermatophyte in a dog.
Highlights
Osteomyelitis is an inflammatory process usually secondary to infection which involves the bone and its medulla
The adjacent joints may be involved, and it may be difficult to assess whether the infectious arthritis or the adjacent osteomyelitis is the primary lesion
Images of e102 Osteoarticular Infection of the Shoulder Joint Due to Trichophyton Spp. in a Dog Feline and Cabassu the Computed tomography (CT) associated with clinical signs made septic arthritis more likely, even though a tumour remained a possible differential diagnosis
Summary
Osteomyelitis is an inflammatory process usually secondary to infection which involves the bone and its medulla. Mediolateral radiographs of the right shoulder joint, taken by the referring veterinarian, revealed an illdefined punched-out osteolytic lesion at the articular surface of the caudal glenoid cavity and the humeral head with new bone formation at the margins of the aforementioned lysis (►Fig. 1). A focal defect of the cartilage and subchondral bone on the caudal humeral head was found, compatible with OCD (►Fig. 3A), as well as severe proliferative synovitis and eburnation on the glenoid cavity. Samples of cartilage with subchondral bone from the caudal humeral head defect and synovial membrane were taken for histological analysis and microbiological culture with. As no clinical improvement was observed, the referring veterinarian decided to interrupt the antifungal treatment, based on a negative synovial fluid culture obtained by joint aspiration. Lameness and pain worsened and the general condition of the dog deteriorated rapidly and the owner elected euthanasia without consenting to a post-mortem examination
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