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. 2023 Oct 18;4(10):782-790.
doi: 10.1302/2633-1462.410.BJO-2023-0052.

Nexus Evaluation Primary Trident II UNcemented shEll (NEPTUNE)

David F Hamilton  1   2 , Paul Gaston  2   3 , Gavin J Macpherson  2   3 , Philip Simpson  3 , Nick D Clement  3
Affiliations

Nexus Evaluation Primary Trident II UNcemented shEll (NEPTUNE)

David F Hamilton et al. Bone Jt Open. .

Abstract

Aims: The primary aim of this study is to assess the survival of the uncemented hydroxyapatite (HA) coated Trident II acetabular component as part of a hybrid total hip arthroplasty (THA) using a cemented Exeter stem. The secondary aims are to assess the complications, joint-specific function, health-related quality of life, and radiological signs of loosening of the acetabular component.

Methods: A single-centre, prospective cohort study of 125 implants will be undertaken. Patients undergoing hybrid THA at the study centre will be recruited. Inclusion criteria are patients suitable for the use of the uncemented acetabular component, aged 18 to 75 years, willing and able to comply with the study protocol, and provide informed consent. Exclusion criteria includes patients not meeting study inclusion criteria, inadequate bone stock to support fixation of the prosthesis, a BMI > 40 kg/m2, or THA performed for pain relief in those with severely restricted mobility.

Results: Implant survival, complications, functional outcomes and radiological assessment up to ten years following index THA (one, two, five, seven, and ten years) will be performed. Functional assessment will include the Oxford Hip Score, Forgotten Joint Score, 12-Item Short Form Health Survey, EuroQol five-dimension health questionnaire, and pain and patient satisfaction. Radiological assessment with assess for acetabula lucent lines, lysis, and loosening according to DeLee and Charnley zones.

Conclusion: This study is part of a stepwise introduction of a new device to orthopaedic practice, and careful monitoring of implants should be carried out as part of the Beyond Compliance principles. The results of this study will provide functional, radiological, and survival data to either support the ongoing use of the HA acetabulum or highlight potential limitations of this new implant before wide adoption.

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Conflict of interest statement

G. J. Macpherson reports consulting fees and payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing, or educational events from Stryker, unrelated to this study. P. Simpson reports consulting fees from Stryker and DePuy Synthes, unrelated to this study. N. D. Clement is a member of the editorial boards of Bone & Joint Research and The Bone & Joint Journal.

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