Preoperative planning for total hip arthroplasty. Quantitating its utility and precision

Area of Science:

• Orthopedic Surgery
• Surgical Planning
• Biomedical Engineering

Background:

• Preoperative planning is crucial for successful total hip arthroplasty (THA).
• Accurate estimation of magnification and implant size impacts surgical outcomes.
• Cemented and cementless THA techniques have different planning considerations.

Purpose of the Study:

• To evaluate the accuracy and usefulness of preoperative planning in cemented and cementless THA.
• To identify discrepancies between planned and actual surgical procedures.
• To determine factors influencing implant size selection and leg-length equalization.

Main Methods:

• Prospective study of 110 primary total hip arthroplasty cases.
• Surgeons recorded preoperative plans including magnification, implant size, and anticipated problems.
• Comparison of planned variables with intraoperative findings.

Main Results:

• Preoperative magnification estimates frequently differed from actual magnification, affecting implant size in 17% of cases.
• Implant sizing prediction accuracy: 62% for acetabular cups, 78% for cemented stems, 42% for cementless stems.
• Leg-length equalization was a goal in only 70% of cases; intraoperative problems stemmed from technique/equipment, not anatomy.

Conclusions:

• Current preoperative planning methods need improvement, especially for estimating magnification and bone morphology from radiographs.
• Preoperative planning may not significantly reduce intraoperative complications.
• Enhanced accuracy in preoperative assessment is vital for optimizing THA outcomes.