Radiographic verification of leg length and offset during hip arthroplasty is important because it:

• A. It helps confirm cup orientation during closure
• B. It ensures limb length and offset are optimized through radiographic checks
• C. It is optional and rarely influences outcome
• D. It is only used for research data

Answer: (B)

The main idea is that restoring the correct leg length and femoral offset is essential for normal gait and hip stability after a hip replacement. Intraoperative radiographs give real-time feedback on how the final components affect these parameters, allowing the surgeon to adjust neck length, head size, cup depth, or stem seating to achieve symmetry with the opposite side or the planned target. When length and offset are properly restored, abductor tension and lever arm are preserved, reducing the risk of limp, abnormal gait, impingement, or dislocation and improving overall function. While imaging can also help with cup orientation, its primary purpose here is to optimize limb length and offset rather than serve as a standalone check or for research.