Zimmer | Trilogy Longevity Constrained Liner | Which Medical Device
Categorised under:
Orthopaedics
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Hip
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Acetabular components - uncemented
Orthopaedics
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Hip
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Revision systems
From Which Medical Device
The Trilogy Longevity Constrained Liner (aka the Epsilon socket) is a constrained socket, available as a liner for the Zimmer Trilogy and Trabecular Metal acetabular shells or in a version intended for cementing into a shell. It has a unique design that aims to improve on the range of motion seen in other captive cup systems by incorporating antero-superior and postero-inferior cut-outs to avoid impingement, particularly in flexion/internal rotation and extension/external rotation. The polyethylene is supported by metal retaining fingers which prevent dislocation and which should be positioned postero-superiorly. The increased range is demonstrated in dry-bone studies.
The liner can be inserted into a well-fixed acetabular shell during a revision procedure, but supplemental screws are recommended.
We could not find published results for this device.
Longevity is a highly cross-linked polyethylene associated with lower wear rates than standard polyethylene, as is Durasul, also a Zimmer product.
Triclot P, Grosjean G, El Masri F, Courpied JP, Hamadouche M. A comparison of the penetration rate of two polyethylene acetabular liners of different levels of cross-linking. A prospective randomized trial. J Bone Joint Surg Br. (2007) Nov; 89(11): 1439-45.
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