Final answer:
The condition with ipsilateral pelvic drop and compensated trunk lean is known as Trendelenburg sign or gait, often indicating gluteus medius weakness.
Step-by-step explanation:
The condition described by having an ipsilateral pelvic drop with a compensated trunk lean to the same side is typically referred to as Trendelenburg sign or Trendelenburg gait. It occurs when the gluteus medius muscle is weak or non-functional on the side of the pelvic drop, which leads to an instability during walking.
The ipsilateral trunk lean is a compensatory mechanism to maintain balance and decrease the amount of force needed by the hip abductors to stabilize the pelvis. In a clinical setting, observing this gait can help diagnose underlying neuromuscular disorders or hip joint problems.