Background: Lateral Patellar luxation in foals is rare and occurs more frequently in ponies. The etiology may be congenital, hereditary, developmental, or secondary to trauma. It may be either complete or partial. Clinical signs typically include lameness, joint effusion, and impaired limb function, and diagnosis is based on clinical examination and radiographic evaluation. Treatment varies depending on the severity and type of luxation. Methods: (case description) Two cases of right congenital lateral patellar luxation in foals were presented. The first was a 21-day-old Racking colt with lameness and joint effusion. The second case was a 30-day-old Arabian colt with similar clinical signs and fibrosis of medial muscular structures. In both cases, irreducible lateral luxation of the patella was confirmed on physical examination and skyline radiographs. This study aimed to describe a U-shape recession sulcoplasty for treatment of complete lateral patellar luxation. Results: ( treatment and surgery plan) Under general anesthesia, surgical exposure was achieved a dorso-laterally incision from the distal femur to the tibial tuberosity, and complete releasing of patella was performed. U-shape recession sulcoplasty was performed to deepen the femoral trochlear groove and restore patellar tracking. For this purpose, two parallel longitudinal incisions were made along the trochlear ridge, connected by a transverse cut to free a U-shaped osteochondral block. The osteochondral block was not completely excised and after minimal removal of subchondral bone, the block was replaced. Then medial imbrication was performed and the joint capsule closed routinely. Postoperative care included rest, anti-inflammatory therapy, and gradual return to activity. At 6-week follow-up, both foals showed reduced lameness, improved joint mobility, and resolution of effusion. Conclusion: U-shape recession sulcoplasty appears to be an effective surgical technique for correction of congenital patellar luxation in foals; however, due to the rarity of this condition, long-term prognosis remains unclear.

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