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Flexural disorders in extremities are defined as the failure of the joint to reach the normal extension angle or to maintain the achieved angle. The most common musculoskeletal anomaly in newborn calves are flexural deformities (17). One percent of the calves are born with a fatal defect and 50% of these suffer flexural deformity (16). Although there are not many studies on the prevalence of tendon disorders in cattle, Anderson at al. (5) reported that 21% of the extremity problems in cattle are tendon-related. Congenital flexural deformity is commonly characterized by the flexion of carpal, metacarpophalangeal, tarsal and metatarsophalangeal joints (1, 5, 7, 11, 12, 19). Flexural deformity can be classified as mild, moderate and severe (7). In mild deformities, a calf could walk on the tip of the hoof (7, 21); the heels, however, do not touch the ground. In moderate deformities, the animal could stand on the tip of the hoof; it could only walk, however, on the dorsal side of the ankle joint (12). Calves with severe (advanced) deformity try to stand or walk on the dorsal side of the foot, fetlock and foot joint or the carpal joint (7, 21). Furthermore, deformities could accompany arthrogryposis that includes neck, carpal and tarsal joints. Affected animals may avoid sucking milk, which complicates the case by preventing the development of passive immunity. Flexural deformity could easily be diagnosed by observing the flexed leg during inspection. In calves with untreated flexural deformities, septic arthritis could develop due to the formation of skin ulcers (12). Advanced congenital flexural deformities may lead to difficult deliveries (15). 1) This study was funded by Van Yuzuncu Yil University Research Projects Funding Unit under project number THD-2017-5505. Degree of deformity and certain hormone, vitamin and trace element levels in the serum of calves with congenital flexural deformity1)