<prompt> Which of the following movements is restricted in Perthes disease -Adduction external rotationAbduction external rotationAdduction internal rotationAbduction internal rotation  <response>: Ans. is d i.e., Abduction internal rotationClinical features of Perthes diseaseo Perthes disease is common in male of age group 5-10 years.o Pain in the hip, often radiating to knee,o Limp antalgic limpo Limitation of movement:-Abduction, internal rotation and extension are limited, therefore there is adduction, external rotation, and flexion deformity,o Shortening of limb.o Positive trendelenburg test.o During the disease process, bone age is 1-3 years lower than the normal. After healing, bone age returns to normal. 