In a previously reported method [18,22,23], the patient is placed in the modified supine position with the operative hip in 10° of flexion, 15° of internal rotation, 10° of lateral tilt, and 30° of abduction. An extra wide peroneal post is used to minimize the risk of pudendal nerve injury. Traction is first applied to break the joint's vacuum seal. The leg is then slightly adducted over the post, thereby venting the capsule and laterally displacing the femoral head. Additional traction, typically requiring 25 to 50 pounds of force, is then required to create approximately 10 mm of joint distraction for safe surgical instrument clearance. Minimal countertraction is also applied to the contralateral leg to reduce the amount of traction necessary on the operative leg.
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