right positive means patient stands on right leg and left side pelvis sinks So right side is the pathological side so shouldn’t the answer be right superior gluteal nerve?
Positive trendelenburg test on the right side indicates a left superior gluteal nerve injury
The gluteus medius and minimus are powerful abductors of the hip supplied by the superior gluteal nerve
Normally, when the leg is lifted off the ground,the gluteus medius and medius on the opposite side exert traction on the hip bone.
This results in a slight raising of the pelivis on the unsupported side,which helps maintain the trunk upright position.