The quadriceps angle: reliability and accuracy in a fox (Vulpes vulpes) pelvic limb model.

Objectives: To evaluate the effect of measurement technique and limb positioning on quadriceps (Q) angle measurement, intra- and interobserver reliability, potential sources of error, and the effect of Q angle variation.

Study Design: Cadaveric radiographic study and computer modeling.

Animals: Pelvic limbs from red foxes (Vulpes vulpes).