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Table 1 Grades of patellar luxation in sheep

From: A low morbidity surgical approach to the sheep femoral trochlea

Grade Patella at examination Luxation Reposition Reluxation Lameness Bone deformities
I reduced manual by digital pressure spontaneous rare mild seldom
II reduced in extension and luxated in flexion manual by digital pressure or spontaneous in flexion manual by digital pressure or spontaneous in extension upon manipulation resolvable skipping lameness sometimes
III luxated spontaneous manual by digital pressure frequent severe often
IV luxated permanent not possible permanent crouching stance very often
  1. Patellar luxations in sheep are evaluated according to the grading scales developed for small animals such as cats and dogs [50, 62]. Diagnosis can be made upon clinical examination; radiographic analysis is not necessary. Clinical signs at adspection include abnormalities in gait or hindleg carriage with the stifle joint flexed, lameness, locking of the affected limb in extension, and -especially in bilateral luxations- crouching, bowlegged or knock-kneed stance.