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Medical Definition of Coxa plana
1. A disorder characterised by the deterioration of the head of the femur in the hip joint, due to its insufficient blood supply. This disorder occurs most frequently in boys aged 5 to 10 years and tends to run in families. Symptoms include thigh pain, hip pain, knee pain, atrophy of muscles in the thigh, hip stiffness and walking with a limp. (27 Sep 1997)