Patient-Specific Broach Preserves Cortical Bone in Hip Implants
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Solution Overview
Problem
Conventional hip prosthesis procedures often result in the unnecessary removal of cortical bone during femoral neck preparation, which can compromise the structural integrity and natural anatomy of the patient's hip joint.
Innovation Solution
A patient-specific femoral neck implant and associated tools are designed using three-dimensional imaging and modeling to preserve cortical bone by creating a custom broach and implant that match the unique cortical/cancellous bone interface, allowing only cancellous bone to be removed, thus conserving the natural femoral neck anatomy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hip prosthesis procedures are used, then the implant can be installed, but cortical bone is unnecessarily removed which compromises structural integrity
Solution Approach 1:
The broach is designed with a cutting surface that selectively targets only the cancellous bone at the cortical/cancellous interface while preserving the cortical bone layer. The implant body is configured with an outer surface that conforms to the cortical boundary surface, ensuring local differentiation in bone removal and preservation based on tissue type and structural requirements.
2Manufacturing precision
If conventional broaches are used, then bone removal is achieved, but the cutting surface does not match the patient's unique cortical/cancellous interface
Solution Approach 1:
The broach design is predetermined based on pre-operative planning and imaging data analysis. The cutting surface geometry is pre-configured to match the expected cortical/cancellous interface morphology before surgery, allowing for precise fit without requiring intraoperative adjustments or complex customization during the procedure.
Solution Approach 2:
The broach cutting surface is designed as a negative copy or complementary match to the patient's unique cortical boundary surface. By creating a reverse engineering representation of the cortical/cancellous interface from imaging data, the broach achieves precise geometric correspondence that enables accurate bone removal and optimal implant fit.
Data Source
AI summary
A method for preparing a femoral neck for receiving a neck implant includes resecting a femoral head from a femoral neck of a patient according to a pre-operative patient-specific plan. The method also includes removing only cancellous bone from the femoral neck and proximal femoral bone of the patient using a patient-specific broach. The patient-specific broach has a three-dimensional cutting surface matching as a negative mold a cortical/cancellous bone interface surface of the femoral neck of the patient.