It's kind of hard to say which model is most reliable. Taken care of properly, they'll all hold true. But there are some models more prone to certain things (subframe, etc) than others, but again, the main thing is how well it was looked after by the person before you.
obÂ·tuÂ·raÂ·tor forÂ·aÂ·men. A large, oval or irregularly triangular aperture in the hip bone, the margins of which are formed by the pubis and the ischium; it is closed by the obturator membrane, except for a small opening for the passage of the obturator vessels and nerve. Synonym(s): foramen obturatum [TA] .
Examples from the Web for obturator foramen. Historical Examples. The obturator foramen is a small oval opening posteroventral to the acetabulum between the ischium and the pubis. Variation in the Muscles and Nerves of the Leg in E. Bruce Holmes. The larger ventral part arises directly from the anterior and ventral edges of the obturator foramen.