Triathlon® Posteriorly Stabilized (PS) Total Knee System - Outcomes Study

Not Applicable

Completed

• Conditions: Arthroplasty, Replacement, Knee
• Interventions: Device: Triathlon® PS Total Knee System

• Registration Number: NCT00957021
• Lead Sponsor: Stryker Orthopaedics

Brief Summary

The purpose of this study is to evaluate the clinical outcomes (range of motion, pain, function, radiographic stability, and health related quality of life) of patients receiving the Triathlon® Posterior Stabilized (PS) Total Knee System. These outcomes will be evaluated using pre-operative scores and comparing them to post-operative scores in addition to being compared with cases who received the Scorpio® PS implant.

Detailed Description

The Triathlon® Posteriorly Stabilized (PS) Total Knee System components are for use in cemented total knee arthroplasty for painful, disabling joint disease of the knee resulting from non-inflammatory degenerative joint disease (including osteoarthritis, traumatic arthritis or avascular necrosis) or rheumatoid arthritis (excluded from this study according to protocol).

The components are designed to improve range of motion (ROM) and stability. This study serves to demonstrate that subjects have reduced pain, increased ROM and improved stability following implantation with the Triathlon® PS Total Knee System.

Study Timeline

• Study Start: 2005-12
• Study First Submitted: 2009-08-10
• Study First Submitted QC: 2009-08-11
• Study First Posted: 2009-08-12
• Primary Completion: 2011-03
• Results First Submitted: 2013-09-05
• Results First Submitted QC: 2013-11-12
• Results First Posted: 2013-12-05
• Study Completion: 2014-01
• Status Verified: 2016-11
• Last Update Submitted: 2016-11-29
• Last Update Posted: 2017-01-25

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 409

Inclusion Criteria

1. The subject is a male or non-pregnant female 21-80 years of age at the time of enrollment.
2. The subject requires a primary cemented total knee replacement.
3. The subject has a diagnosis of osteoarthritis (OA), traumatic arthritis (TA), or avascular necrosis (AVN).
4. The subject has intact collateral ligaments.
5. The subject has signed the IRB approved, study specific Informed Patient Consent Form.
6. The subject is willing and able to comply with postoperative scheduled clinical and radiographic evaluations and rehabilitation.

Exclusion Criteria

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

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Triathlon® PS Total Knee System	Triathlon® PS Total Knee System	Triathlon® PS Total Knee System

Primary Outcome Measures

Name	Time	Method
Range of Motion	2 years	The primary outcome of this study is to compare active range of motion values for the Triathlon PS Total Knee System.

Secondary Outcome Measures

Name	Time	Method
Patient Outcome Knee Society Score	1,2 and 5 years	The Knee Society Scores (KSS) at 1, 2, and 5-year visits will be compared. Additionally, comparison of scores at each post-surgery visit with baseline will be tested to see if any improvement is seen at each time point. The Knee Society Clinical Rating System is comprised of two distinct sub-scores: one for pain, ROM and joint stability, and one for functional parameters. Sub-scores range from a potential minimum score of 0 to a maximum score of 100 points. Although the specific scores are not distinguished as "excellent," "good," "fair," or "poor," a higher value represents a better outcome.
Patient Outcome SF-36	1,2,3,4 and 5 years	The SF-36 score at 1, 2, 3, 4 and 5-year visits will be compared at each post-surgery visit with baseline to see if any improvement is seen for each time point.The SF-36 includes a physical component and a mental component and is completed by the participant. Physical component and mental component scores were calculated on a scale ranging from 0 to 100. Low values represented a poor health state and high values represented a good health state.
Patient Outcome Lower-Extremity Activity Scale	1,2,3,4 and 5 years	The Lower-Extremity Activity Scale (LEAS) score at 1, 2, 3, 4 and 5-year intervals will be compared at each post-surgery visit with baseline to see if any improvement is seen for each time point.The LEAS is completed by the participant to assess activity level. Activity levels were ordered in terms of intensity from 1 to 18, with 18 indicating the highest activity level. A level of 1 indicated that the subject was confined to bed all day while a level of 18 indicated that the subject was up and about at will inside and outside of the house, and also participated in vigorous physical activity, such as competitive level sports, on a daily basis.
Patient Outcome WOMAC	5 years	The Western Ontario and McMaster Osteoarthritis Index (WOMAC) scores at 1, 2, 3, 4 and 5-year visits will be compared between groups, when data is available. Additionally, comparison of scores at each post-surgery visit with baseline will be tested to see if any improvement is seen for each time point. The WOMAC collects information specific to osteoarthritis outcomes. The questionnaire uses a visual analog scale for pain, measuring factors of general pain, stiffness, and physical findings. Pain is scored from 0 to 100 for each set of factors, with 0 indicating no pain and 100 indicating extreme pain. Total WOMAC scores range from 0 to 300. Lower values represent better outcomes.; Data for the WOMAC is only available at the 5 year interval due to typographical errors noted on earlier interval forms rendering them invalid for comparison.
Radiographic Outcome	1,2 and 5 years	Radiographic success/failure at 1, 2, and 5-year visits will be assessed. Radiographic failure is defined as a score of 10 or greater according to the Knee Society Roentgenographic Scoring System, regardless of symptoms. A migrating or shifting prosthesis with or without the disappearance of radiolucent lines is also a failure regardless of score.

Trial Locations

Locations (11)

Hughston Clinic PA; 🇺🇸 Columbus, Georgia, United States

New England Baptist Hospital; 🇺🇸 Boston, Massachusetts, United States

Ireland Hip and Knee Surgery; 🇺🇸 Indianapolis, Indiana, United States

Pro-Sports Orthopaedics, Inc. / New England Baptist Hospital; 🇺🇸 Boston, Massachusetts, United States

St. Cloud Orthopaedic Associates; 🇺🇸 Sartell, Minnesota, United States

Specialty Orthopaedics; 🇺🇸 Harrison, New York, United States

Wellington Orthopaedics & Sports Medicine; 🇺🇸 Cincinnati, Ohio, United States

Tri County Orthopedic Surgeons, Inc.; 🇺🇸 Massillon, Ohio, United States

Kelsey-Seybold Clinic; 🇺🇸 Houston, Texas, United States

University of Virginia; 🇺🇸 Charlottesville, Virginia, United States

New Hampshire Orthopaedic Surgery, PA; 🇺🇸 Manchester, New Hampshire, United States