Constrained Dual Mobility Hip Prosthesis Insertion
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Solution Overview
Problem
Constrained acetabular inserts with dual mobility liners face challenges in retaining the liner without compromising its mobility and stability, particularly in preventing dislocation of the femoral head in hip joint prostheses.
Innovation Solution
A constrained acetabular insert with a perimeter extending beyond a hemisphere and a dual mobility liner with screw threads, allowing the liner to tilt and rotate within the insert, while the femoral head also tilts and rotates within the liner, with tabs engaging the screw threads for secure insertion and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dual mobility liner extends beyond a hemisphere to constrain the femoral head, then dislocation prevention is improved, but insertion into a constrained acetabular insert becomes difficult
Solution Approach 1:
The insertion process is segmented into two phases: first inserting the dual mobility liner into the constrained acetabular insert, then separately inserting the femoral head into the dual mobility liner. This segmentation allows each component to be inserted independently, overcoming the difficulty of inserting a constrained liner into a constrained insert.
Solution Approach 2:
The dual mobility liner is prepared in advance by inserting it into the constrained acetabular insert before the femoral head is inserted. This preliminary action creates a ready-to-receive configuration that facilitates subsequent femoral head insertion while maintaining the constrained design benefits.
2Stability of the object's composition
If the constrained acetabular insert and dual mobility liner both extend beyond a hemisphere, then stability is improved, but the complexity of insertion increases
Solution Approach 1:
The dual mobility liner is nested within the constrained acetabular insert, and the femoral head is nested within the dual mobility liner. This nested configuration allows all three components to be retained in their constrained positions while simplifying the insertion sequence through systematic nesting rather than simultaneous complex positioning.
Data Source
Figure 1A~1B
Figure 1C
Figure 2A
AI summary
A system includes a constrained acetabular insert, a dual mobility liner, and a femoral head. The constrained acetabular insert has its perimeter extending beyond hemisphere and the dual mobility liner has its perimeter extending beyond hemisphere and configured to tilt and rotate within the constrained acetabular insert. The femoral head is configured to tilt and rotate within the dual mobility liner. The constrained acetabular insert may include a plurality of tabs and the dual mobility liner may include screw threads for receiving the plurality of tabs.