[Custom made hip prostheses : principles and design].

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Medical imaging

Context:

• Custom hip prostheses require detailed anatomical data for accurate design.
• Preoperative planning is crucial for successful hip replacement surgery, especially in cases of deformity.

Purpose:

• To outline the methodology for designing custom-made hip prostheses using both intramedullary and extramedullary components.
• To detail the specific imaging requirements (X-ray and CT scans) and data processing techniques for prosthesis design.

Summary:

• The design process integrates X-ray and CT scan data to reconstruct the femoral cavity and plan prosthesis components.
• The intramedullary part uses CT data for femoral cavity reconstruction via density gradient method.
• The extramedullary part replicates preoperative planning elements like center of rotation and anteversion axis.

Impact:

• Enables precise design of custom hip prostheses, particularly for patients with severe upper femur deformities and excessive anteversion.
• Improves the accuracy of hip replacement surgery by providing patient-specific implant designs.
• Facilitates the reconstruction of complex femoral anatomy for better surgical outcomes.