Placing both legs in traction prevents pelvic rotation.
The injured hip is slightly flexed and adducted to allow nail entrance. The hip on the uninjured side is extended and abducted to allow lateral imaging. (The two legs are positioned like open scissors.)
The C-arm is placed beside the uninjured hip. It is helpful to use slightly oblique lateral views to avoid superimposition of instrumentation, or of the patient’s opposite leg.