<prompt> Which of the following test is useful in diagnosis of congenital dislocation of hip ?Barlows testThomas testHibbs testLaguerres test  <response>: Barlow;s test : Clinical test in DDH Test has two pas . 1st pa - surgeon faces child;s perineum .He grasps the upper pa of each thigh , with his fingers behind on the greater trochanter and thumb in front.The child;s knee are fully flexed and hips flexed to a right angle .The hip is now gently adducted ,gentle pressure is exeed by examining hand in a proximal direction while the thumb tries to ;push out; the hip .As femoral head rolls over the posterior lip of acetabulum ,it may ,if dislocatable slip out of acetabulum .one feels an abnormal posterior movement , appreciated by the fingers behind greater trochanter .thereay be a distinct ;clunk; nothing happens-hip normal or may be already dislocated 2nd pa - hip in 90 degree flexion and fully adducted ,thighs are gently abducted . The examiner;s hand tries to pullbthe hip while the fingers on greater trochanter exe pressure in forward direction , as one tries to put back a dislocated hip.If nothing happen - normal hip or is an irreducible dislocation .It is done in infants . Thomas test is for hip flexion deformity REF:Essential ohopedics, Maheshwari ,5th edition, pg no.220 