Rotatory intra-articular dislocation of the patella in two dogs

Two young (8 and 13 week old) dogs were referred for evaluation of acute lameness. Physical examination, radiography, and surgical exploration of their stifles confirmed rotatory intra-articular dislocations of the patella. The dislocated patellas were stabilized with wire into their anatomically correct positions and allowed to heal. Follow-up radiography revealed patellar elongation attributable to excessive peripatellar mineralization. Patellar orientation, as evident on radiographs obtained after trauma, may indicate whether closed or open reduction of these injuries is necessary.