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Comparison of Functional Results of ADM X3-MoP Cup (Stryker) and a CoC Cup (Zimmer) in Young Patients

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02301182
Recruitment Status : Enrolling by invitation
First Posted : November 25, 2014
Last Update Posted : November 25, 2014
Information provided by (Responsible Party):
University of Aarhus

Brief Summary:
A Single-Center Randomized, Patient-Blinded, Prospective Five-Year Study to Compare the Functional Results after Insertion of ADM X3-MoP Cup (Stryker) and a CoC Cup (Zimmer) in Primary THA. 60 patients will be enrolled during a 2 year period. At surgery tantalum beads will be inserted into predrilled holes of the polyethylene rim for assessment of motion of the large mobile poly in the ADM Trident Cup by use of RSA. Patients will be followed by functional examinations as well as PROM assessment.

Condition or disease Intervention/treatment Phase
Arthroplasties, Hip Replacement Device: ADM X3-MoP Cup Device: CoC Cup Not Applicable

Detailed Description:
With Metal-on-Metal (MoM) articulations leaving the marked the THA bearing choice for younger patients is currently debated and overall the choice stands between CoC and MoP. New HXLPE is wear-resistant and safe and clinical HXLPE wear (RSA) hardly exceed the wear measured in retrieval CoC implants. For CoC articulations stripe wear on edge loading is a reported problem leading to increased wear in examined retrieval components and CoC wear is dependent on component position. Although the risk is very small, CoC bearings are at still at risk of fracture, and functional squeaking is a complication that adversely affects the quality of life in about 1% of CoC THA patient. Dual mobility MoP cups were designed for reducing hip dislocations in older patients treated with THA after medial hip fractures. The concept provides good stability and mobility and may also be an optimal solution for younger and active patients; however, dual mobility MoP has not previously been documented for use in younger patients. The anatomical dual mobility (ADM) cup design (Stryker) is soft tissue sparing (iliopsoas tendon) potentially leading to lesser groin-pain and squeaking is not a concern. It is currently unknown if the outer-articulation of the dual mobility PE liner keeps moving over time or could impinge in the joint capsule in an undesirable position and result in unwanted edge loading and higher wear-rates. Metal ions are produced even in MoP bearings and even though in dual-articulation MoP bearings most (90%) of the motion is believed to occur between the head and liner (ceramic-polyenthylene), the metal ion levels may be higher than expected for MoP hips (large poly contact in metal shell), while expectedly there will be no metal ions in CoC THA.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 60 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment
Official Title: A Single-Center Randomized, Patient-Blinded, Prospective Five-Year Study to Compare the Functional Results After Insertion of ADM X3-MoP Cup (Stryker) and a CoC Cup (Zimmer) in Primary THA
Study Start Date : November 2014
Estimated Primary Completion Date : November 2021
Estimated Study Completion Date : November 2023

Arm Intervention/treatment
Active Comparator: ADM X3-MoP Cup
THA: ADM dual-mobility hydroxyapatite coated cups with X3TM HXLPE liners on 28mm BIOLOX® delta femoral heads (Stryker) with femoral stems being 2nd generation Accolade stems of the taper lock type, proximal circumferential coated with a 50µm plasma-spray PureFix HA coating to aid the mechanical engagement in bone coating (Stryker)
Device: ADM X3-MoP Cup
Active Comparator: CoC Cup
THA: CoC BIOLOX® delta-delta large-head single-mobility cementless fiber-mesh titanium coated acetabular system from Zimmer (Zimmer TrilogyIT cup/CLS spotorno stem) with a grit-blasted osteophilic titanium alloy CLS® Spotorno femoral stems (Zimmer) that has a three-dimensional wedge shape and sharpened ribs in the proximal region
Device: CoC Cup

Primary Outcome Measures :
  1. Motion analysis (accelerometer (Ax3 Axivity) based activity monitoring) [ Time Frame: 5 year ]
    For all participants: Inertia sensors are a new technology for patient motion analysis which allows simple and fast routine clinical movement analysis and long-term activity monitoring. We will employ the newest generation of accelerometer (Ax3 Axivity) based activity monitoring (small, light, low cost, validated for orthopaedic patients also with walking aids) to count, in real life, the number of events and the duration of postures and activities. Further muscle power investigations such as by use of the legg extension power rig will be used.

  2. questionnaires ("the Harris Hip Score" (HHS), the Oxford Hip Score (OHS), the HOOS score, satisfaction, dislocation, and revisions) [ Time Frame: 5 year ]
    For all participants: Pre- and postoperative clinical evaluations will be made according to "the Harris Hip Score" (HHS), the Oxford Hip Score (OHS), the HOOS score, and satisfaction, dislocations and revisions will be noted. Moreover, pre-operative rest and motion pains will be assessed by visual analogue scale scores (VAS).

  3. Radiography (implant migration and wear) [ Time Frame: 5 year ]
    For all participants: Within a week following surgery a stereo x-ray is performed and this functions as the baseline for future follow-up (in this study at 1 year, 2 years and 5 years). When comparing all stereo x-rays in a patient series, implant migration with respect to a set of bone markers can be calculated in three dimensions as a function of time - similarly wear of the implant surfaces can be evaluated.Fluoroscopic stereoradiometric recordings (Dynamic RSA) can be used to assess the functional motion of implants at desired motion speeds. In this study we record the liner motion of the ADM cup with the patients in different positions that in theory stresses the motion of the liner into new positions at edge-motions. The purpose is to gain knowledge on the safety function of the implant in vivo - if the liner moves and if it positions safely like it is supposed to.

Information from the National Library of Medicine

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Ages Eligible for Study:   40 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • primary hip osteoarthritis
  • sufficient bone quality for total hip arthroplasty
  • age 40 through 65 years of age
  • informed and written consent
  • patient can only enter the project with one hip

Exclusion Criteria:

  • neuromuscular or vascular disease in the affected leg
  • patients with osteoporosis
  • fracture sequelae or previous extensive hip surgery
  • patients with metabolic bone disease including rheumatoid arthritis
  • non-Danish citizenship
  • patients who do not comprehend the Danish language
  • senile dementia
  • alcoholism and drug abuse
  • major psychiatric disease
  • current metastatic cancer disease and on-going treatment with radiation therapy/chemotherapy
  • severe systemic disease affecting gait
  • contralateral knee, hip and/or spine disease
  • on-going case regarding industrial injury insurance of the hip
  • patients with very poor dental status

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02301182

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Aarhus University Hospital
Aarhus, Denmark, 8000
Sponsors and Collaborators
University of Aarhus

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Responsible Party: University of Aarhus Identifier: NCT02301182    
Other Study ID Numbers: VEK-44819
First Posted: November 25, 2014    Key Record Dates
Last Update Posted: November 25, 2014
Last Verified: October 2014