It is important to identify compensations seen during the modified thomas test because option D: most people have short/stiff anterior hip muscles.
The modified Thomas test measures the femur's angle of abduction in relation to the pelvis, which is an objective measure, and the pelvic position is constant when comparing results from one test to another. The lower extremity on the concerned side won't be able to stretch all the way at the hip if the iliopsoas muscle is short or there is a contracture. This results in a favourable Thomas test result. This therefore, implies that option D is the right choice.
A psoas dysfunction may occasionally coexist with a very flexible patient's Thomas test being normal. However, a positive test is a good indication of psoas hypertonicity in the patient with a normal hip joint.
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