Comparing X-3 To N2vac Polyethylene With the Triathlon Total Knee System

Phase 4

Withdrawn

• Conditions: OA; Osteoarthritis
• Interventions: Device: X-3 polyethylene; Device: N2Vac polethylene

• Registration Number: NCT00665964
• Lead Sponsor: Dalhousie University

Brief Summary

Methodology: This study will be a randomized, multi-center evaluation comparing N2vac polyethylene inserts and patellas with X3 inserts and patellas when used in the Triathlon PS total knee system.

Study Duration: 12-18 month enrollment period + 10 year follow-up for each case years total duration

Multi-centre study

Objectives

Primary: To compare the 10 year implant survival of the Triathlon PS total knee system when X3 polyethylene components are used to the same knee system when N2Vac components are used.

Secondary: To compare pain, function, radiographic outcomes, and health related quality of life of subjects in both treatment groups. Safety will be assessed by comparison of adverse events between the groups.

Number of Subjects 384 cases (197 each group)

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2008-04-22
• Study First Submitted QC: 2008-04-23
• Study First Posted: 2008-04-24
• Study Start: 2008-05
• Status Verified: 2019-01
• Last Update Submitted: 2019-01-30
• Last Update Posted: 2019-01-31
• Primary Completion: 2020-05
• Study Completion: 2020-05

Recruitment & Eligibility

• Status: WITHDRAWN
• Sex: All
• Target Recruitment: Not specified

Inclusion Criteria

• The subject requires a primary cemented total knee replacement.
• The subject has a diagnosis of osteoarthritis (OA), traumatic arthritis (TA), or avascular necrosis (AVN).
• The subject has intact collateral ligaments.
• The subject has signed the ethic committee approved, study specific Informed Patient Consent Form.
• The subject is willing and able to comply with post-operative scheduled clinical and radiographic evaluations and rehabilitation.

Exclusion Criteria

• The subject has inflammatory arthritis.
• The subject is morbidly obese, BMI > 40.
• The subject has a history of total or unicompartmental reconstruction of the affected joint.
• The subject has had a high tibial osteotomy or femoral osteotomy.
• The subject has a neuromuscular or neurosensory deficiency, that would limit the ability to assess the performance of the device.
• The subject has a systemic or metabolic disorder leading to progressive bone deterioration.
• The subject is immunologically suppressed, or receiving chronic steroids (>30 days duration).
• The subject's bone stock is compromised by disease or infection and cannot provide adequate support and/or fixation to the prosthesis.
• The subject has had a knee fusion at the affected joint.
• The subject has an active or suspected latent infection in or about the knee joint.
• The subject is a prisoner.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
X-3	X-3 polyethylene	X-3 polyethylene which is a new highly cross-linked poly that is theorized to be more durable in vivo
N2Vac polethylene	N2Vac polethylene	conventional polyethylene

Primary Outcome Measures

Name	Time	Method
survival rate of polyethylene	10 years

Secondary Outcome Measures

Name	Time	Method
pain	10 years
radiographic outcomes	10 years
function	10 years
health related quality of life	10 years
adverse events	10 years

Trial Locations

Locations (1)

QEII Health Sciences Centre; 🇨🇦 Halifax, Nova Scotia, Canada