Bone Cement Interdigitation via Perforated Surface
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Solution Overview
Problem
In knee arthroplasty surgeries, existing methods fail to securely attach prosthetic implants to dense or sclerotic bone, leading to loosening and potential implant failure, which necessitates costly and painful replacement procedures.
Innovation Solution
A method involving the use of a perforator tool to create a predetermined array of perforations in the bone surface, optimized for specific bone densities, to enhance the attachment of polymethyl methacrylate bone cement, thereby improving the fixation of prosthetic implants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional bone cement application methods are used on dense or sclerotic bone, then the surgical procedure is simple and quick, but the attachment strength between bone cement and bone is insufficient, leading to implant loosening
Solution Approach 1:
The bone surface is prepared in advance by creating perforations and roughening the surface before applying bone cement. This preliminary action enhances the mechanical interlocking capability of the bone-cement interface, ensuring stronger attachment while maintaining a systematic surgical workflow.
Solution Approach 2:
Perforations are created in the dense or sclerotic bone surface to introduce porosity. This allows bone cement to penetrate into the bone structure, creating mechanical interlocking and significantly improving the attachment strength between the cement and bone.
2Reliability
If perforations are created in the bone surface to enhance cement attachment, then the bond strength increases, but the surgical time and procedural complexity increase
Solution Approach 1:
The bone surface preparation is segmented into discrete perforation sites rather than requiring extensive surface treatment. This allows targeted enhancement of cement attachment at critical locations while minimizing overall surgical time and procedural complexity.
3Manufacturing precision
If extensive bone trimming is performed to prepare the bearing surface, then the implant fit is improved, but excessive cortical bone is removed, weakening the remaining bone structure
Solution Approach 1:
Instead of extensively trimming the entire bone surface, the invention applies local quality enhancement by creating perforations and roughening only specific areas where cement attachment is critical. This preserves the overall bone structure and strength while achieving precise implant fit through targeted surface modification.
Data Source
AI summary
A method of attaching prosthetic implants to bone, applicable to tibia, patella, acetabulum, glenoid, or femur, includes trimming an articular surface of the bone, leaving a trimmed surface. Holes are punched or drilled into the surface in a predetermined array before polymethyl methacrylate bone cement is used to attach the surface to the implant. In an embodiment, the holes are punched by placing a punch-plate with sharpened punch spikes on the surface, and striking the punch plate to drive punches into the trimmed surface. In another embodiment, holes are drilled using a drilling template with predrilled guidance holes placed on the surface of the bone. In another embodiment, holes are drilled by positioning a robotic drill over the trimmed surface; adjusting a drilling pattern of the robotic drill according to the trimmed surface; and using the robotic drill to drill holes of predetermined depth according to the drilling pattern.