US 2025/0017735 A1Published application

Non-impinging dual mobility hip prosthesis

AssigneeSignature Orthopaedics Europe Ltd

InventorsDeclan BRAZIL, Christopher BURGESS

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Abstract

Dual mobility hip prosthesis has a liner rim that recessed with respect to an acetabular cup rim thereof so that an adjacent contact surface of the neck impinges the acetabular cup rim at extreme positions without impinging the liner rim. Furthermore, the acetabular cup rim defines an inner contact face correspondingly angled to the adjacent contact surface of the neck at the extreme positions to reduce point contact loading between the acetabular cup rim and the adjacent contact surface of the neck. As such the present prosthesis tolerates prosthetic impingement between the rim of the acetabular cup and the neck of the femoral component by mitigating against point contact loading force whilst eliminating impingement of edges of the polymeric liner between an edge of the neck and the rim of the acetabular cup and also allowing for sufficiently deep acetabular componentry with reduced likelihood of dislocation.

Claims17

Dependent claims

Dual mobility hip prosthesis comprising:

an acetabular cup defining an outer acetabulum fixing surface and an inner fixing surface;
a fixed liner defining an outer fixing surface configured for fixing to the inner fixing surface of the acetabular cup and an inner articular surface;
a bearing component defining an outer articular surface configured for articulating against the inner articular surface of the fixed liner and an inner articular surface;
a femoral component comprising a neck engaging a head at a distal end of the neck, the head defining an exterior articular surface configured for articulating against the inner articular surface of the bearing component, wherein:
the acetabular cup defines an acetabular cup rim;
the liner defines liner rim;
the liner rim is recessed with respect to the acetabular cup rim so that an adjacent contact surface of the neck impinges the acetabular cup rim at extreme positions of the femoral component with respect to the acetabular cup without impinging the liner rim;
the acetabular cup rim defines an inner contact face correspondingly angled to the adjacent contact surface of the neck at the extreme positions to reduce point contact loading between the acetabular cup rim and the adjacent contact surface of the neck.

5 more elements

Dependencies are inferred from the claim text.