A seven-year-old Labrador Retriever dog was presented with the complaint of chronic
left hindlimb lameness. A diagnosis of partial rupture of the left cranial cruciate
ligament with concurrent cranio-medial synovial cyst formation was made. This cystic
structure was assumed to be communicating with the stifle joint. There was no evidence
of a meniscal tear, but superficial fibrillation of the axial border was present.
Surgical excision of the cyst with concurrent treatment of the cranial cruciate ligament
deficiency by tibial tuberosity advancement was performed with a successful outcome.
Whilst commonly encountered in humans, synovial cysts are uncommon in dogs. To the
authors’ knowledge this is the first reported case of synovial cyst formation in the
stifle of a dog.
Keywords
Stifle - synovial cyst - cranial cruciate ligament - meniscus - arthrotomy