Hi John,
The lesser trochanter is the insertion point of iliopsoas so there cannot really be any friction problem here. In fact the insertion of iliopsoas is a nice benign area and not often a cause of pain. The lesser trochanter can cause ischiofemoral impingement of the quadratus femoris muscle between the lesser trochanter and the ischial tuberosity. It is really an MRI diagnosis as we don’t see the muscle oedema with ultrasound. What I think they are looking for is a friction problem between the iliotibial band and the greater trochanter / G-min /G-med tendons. During a hip replacement the ITB is cut through to gain access and then sewn back up. After the surgery some suture material or scar tissue may cause friction and lead to a trochanteric bursitis and pain. I do use a dynamic manoeuvre. Lay the patient decubitus. Gently flex their knees and hips. Keep their knees together and lift the uppermost ankle towards the roof. You can observe the dynamic movement of the friction plane where the trochanteric bursa lives. It is a great trick.
Steve