Scalloped Bone Surface Preparation for Stable Joint Inserts
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Solution Overview
Problem
Current methods for preparing bone surfaces for joint repairs, particularly in osteopenia patients, require significant bone removal and lack precision, leading to complications and instability in joint implants.
Innovation Solution
A system and method involving a drill guide with arced bores and a drill assembly that creates a scalloped bone surface with convex ridges, allowing for a joint insert to securely seat with minimal bone material removal, using arced drill drives and flexible drive shafts to follow predetermined paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anterior TAR techniques are used to prepare bone surfaces, then joint inserts can be secured, but significant amounts of healthy bone are removed
Solution Approach 1:
The bone preparation is divided into multiple discrete concave channels rather than a single large resection. Each channel is precisely positioned to receive corresponding convex ridges on the joint insert, distributing the securing function across multiple localized interfaces that collectively provide stable fixation while preserving more bone tissue.
Solution Approach 2:
The invention employs concave channels with curved surfaces that complement the convex ridges on the joint insert. This curved geometry allows for gradual engagement and distributed contact areas, enabling secure fixation through surface conformity rather than aggressive bone removal, thereby preserving healthy bone while ensuring implant stability.
2Manufacturing precision
If flat surfaces are created on bone for joint replacement, then joint inserts can be positioned, but large amounts of bone must be removed from concave surfaces
Solution Approach 1:
Instead of removing bone to create flat surfaces, the invention inverts the approach by preserving the natural concave bone geometry and creating corresponding concave channels that match the convex ridges on the joint insert. This inversion allows the joint insert to be positioned with minimal bone removal, as the channels are designed to receive the ridges through precise geometric cooperation rather than requiring extensive bone resection.
3Ease of operation
If lateral approaches are used for joint preparation, then access is improved, but other disadvantages arise regarding soft tissue complications and visualization
Solution Approach 1:
The invention transitions from traditional two-dimensional flat surface preparation to three-dimensional concave channel geometry. By creating channels with depth and curvature that extend in multiple dimensions, the system achieves superior joint insert positioning and securing while maintaining anterior approach benefits, avoiding the soft tissue complications associated with lateral approaches.
Data Source
AI summary
The disclosed subject matter relates to a system and method for preparing a surface of a bone proximate a joint, in which the preparation includes boring a plurality of arced channels/troughs in the bone surface using an arch drill assembly guided by plural guide bores along a predetermined longitudinal arc. The bored troughs create a scalloped surface on the bone to which an inverse contoured joint insert/implant having cooperating convex ridges engages. The plural guide bores are also defined by the predetermined longitudinal arc which may be circular or helical. The disclosed subject matter minimizes bone removal and allows greater access options for preparing the bone surface.