Elliptical Glenosphere for Reverse Shoulder Stability
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Solution Overview
Problem
Conventional reverse shoulder orthopaedic implants often fail to adequately address severe joint instability and pain, particularly in cases where the natural shoulder's soft tissue has degenerated, necessitating a change in shoulder mechanics.
Innovation Solution
A reverse shoulder orthopaedic implant design featuring a hemi-ellipsoidal glenosphere component with a tapered bore and a metaglene component with an annular-shaped platform, allowing for a taper lock configuration, along with a screw cap system to secure compression screws, which enhances stability and reduces notching by adjusting the glenosphere component's position relative to the metaglene component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional reverse shoulder orthopaedic implant is used, then the basic reverse shoulder mechanics are achieved, but joint stability is insufficient and notching occurs
Solution Approach 1:
The glenosphere component transitions from a conventional spherical shape to an elliptical shape with different anterior/posterior and superior/inferior dimensions. This asymmetry allows optimization of the articulation surface geometry to improve joint stability while reducing stress concentrations that cause notching of the scapula.
Solution Approach 2:
The patent modifies key geometric parameters of the glenosphere including its elliptical shape, offset position, and articulation surface curvature. These parameter changes optimize the biomechanics of the reverse shoulder implant to enhance stability and reduce harmful notching effects on the scapular bone.
2Reliability
If the glenosphere component position is adjusted to improve stability, then joint stability improves, but the complexity of implant configuration increases
Solution Approach 1:
The glenosphere component is pre-configured with an optimized elliptical shape and offset position during manufacturing. This preliminary design eliminates the need for complex intraoperative adjustments, as the component is already optimized for stable articulation and reduced notching before implantation.
Solution Approach 2:
The elliptical glenosphere design serves multiple functions simultaneously: it provides stable articulation, reduces notching, and accommodates varying patient anatomies. This multi-functionality reduces the need for additional components or complex configuration options, simplifying the overall implant system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves joint stability and reduces notching occurrences, enabling more effective distribution of forces and improved patient outcomes by allowing the deltoid muscle to raise the arm more efficiently, addressing the mechanical challenges of degenerated shoulders.
Implementation Method 1
A tapered outer surface of the annular-shaped platform may be taper locked in the tapered bore of the glenosphere component.
Data Source
AI summary
A reverse shoulder orthopaedic implant includes a glenosphere component having a lateral bearing surface configured to articulate with a humeral cup of a humeral prosthesis. A metaglene component includes a platform configured to receive glenosphere component.