Trendelenberg's sign is -ve in an Inter-Trochanteric fracture because of :

D i.e. Tensor Abductors of hip are - Gluteus medius and minimusQ (main) - Tensor fascia lata & saoriusQ (accessory) In cases of fracture interochanteric femur both gluteus muscles become ineffective as these are inseed in greater trochanter. Tensor fascia lata (TFL) which is inseed through the iliotibial tract on to the lateral condyle of tibia will still be in a position to affect some abduction thereby causing a negative trendelenberg test.