Traumatic synovial herniation of the medial femorotibial joint as an aetiology of hindlimb lameness in a horse

A 3-year-old Quarter Horse filly presented with an acute history of right hindlimb lameness. Examination the hind found moderate effusion in medial femorotibial joint and a consistent grade 4/5 Ultrasonographic evaluation revealed disruption synovial membrane recess capsule. Arthroscopy identified tear capsule at attachment to collateral ligament. Treatment autologous conditioned serum, rest firocoxib resulted improvement overall Follow-up examination improved lameness score; however, hernia was on sonographic joint.