Clinical trial NCT04687462: Comparison of Polyethylene Insert Variances of Different Total Knee Arthroplasty System in the Same Patients
Official title: Comparison of 1-mm Thickness Variance Polyethylene Insert Total Knee Arthroplasty System and 2-mm Thickness Variance Polyethylene Insert Total Knee Arthroplasty System in the Same Patients
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Total Knee Replacement Arthroplasty
Lead sponsor: The Catholic University of Korea
Sponsor class: OTHER
First posted: 2020-12-29
Enrollment: 50
Sex: ALL
Minimum age (years): 19
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: This study is a prospective, single-centered, randomized controlled clinical trial. Patients undergoing bilateral total knee replacement arthroplasty(TKRA) for both knee osteoarthritis will receive written consent from the patient through informed consent before the surgery. Among the patients undergoing total arthroplasty for both knee joints, only patients who have agreed with written consent will receive the surgery. In one patient who has been decided to be erolled for the stedy, we will set one knee joint as the experimental group, and the other knee joint as the control group. The experimental group will undergo TKRA using Exult total knee system and the control group will get TKRA using Lospa total knee system.
Primary purpose: TREATMENT

Brief summary: Total knee arthroplasty(TKA) is a successful orthopedic surgery with excellent clinical outcome and survival. However, there are concerns about patient satisfaction in previous reports, and dissatisfaction rate of 15-30% is reported in clinical outcomes(PROMs) of some studies. Therefore, for improving the patient's outcome and satisfaction after total knee arthroplasty, it is necessary to change the design of the conventional total knee arthroplsaty implant. The knee is a joint structure with several dynamic functions, and not only the skeletal structure but also the soft tissue balance plays an important role in the function of the knee joint. New implants are being developed to overcome the limitations of conventional TKA implant, including the Exult total knee system (Exult; Corentec). Exult implant has 1mm thickness variance of polyethylene insert, which is different from the conventional total knee systems. This new total knee system has been shown in experimental studies to produce nearly normal knee movement.

The clinical results of this more specific variance of polyethyelen insert thickness total knee implant system are insufficient, and there is also a lack of comparative studies with conventional total knee arthroplasty implant. The purpose of this study is to compare outcomes between 1-mm thickness variance polyethylene insert total knee arthroplasty system(Exult, total knee system, Corentec) and conventional 2-mm thickness variance polyethylene insert total knee arthroplasty system(Lospa total knee system, Corentec) in the same patients. This study is a randomized controlled study in patients undergoing both knee total knee arthroplasty in a day. Radiologic parameter, patients preference and clinical results was investigated in both knee of same patients who received TKA during minimum 2 year follow up.

Detailed description: This study is a prospective, single-centered, randomized controlled clinical trial. Patients undergoing bilateral total knee replacement arthroplasty(TKRA) for both knee osteoarthritis will receive written consent from the patient through informed consent before the surgery. Among the patients undergoing total arthroplasty for both knee joints, only patients who have agreed with written consent will receive the surgery. In one patient who has been decided to be erolled for the stedy, we will set one knee joint as the experimental group, and the other knee joint as the control group. The experimental group will undergo TKRA using Exult total knee system and the control group will get TKRA using Lospa total knee system. The researcher performing the surgery can know which instruments are used for each knee joint according to the random number table assignment result, but the subjects undergoing surgery will be conducted as a single blinded study where it is not possible to know which instruments are used for each side.

Eligibility criteria: Inclusion Criteria:

* Knee osteoarthritis patients for both total knee arthroplasty
* having medicare insurance

Exclusion Criteria:

* Rheumatoid arthritis
* Other inflammatory arthritis
* Crystal-induced arthritis
* Septic arthritis
* Neuropsychiatric patients
* Previous knee operation history
* Patients with preoperative severe limitation of motion (Flexion ontracture ≥ 20, range of motion ≤ 90)
* Patients with preoperative severe defomity of knee alignment (Varus or valgus angle ≥ 15)
* Severe obese patients (BMI ≥ 40)

Primary outcomes:
measure: Western Ontario and McMaster University Arthritis Index(WOMAC) pain scale
timeFrame: Preoperative & postoperative 3, 6, 12, 24 months
Secondary outcomes:
measure: Knee Society Score
timeFrame: Preoperative & postoperative 3, 6, 12, 24 months
measure: Knee range of motion
timeFrame: Preoperative & postoperative 3, 6, 12, 24 months
Other outcomes:
Locations:
Study officials:
affiliation: the Catholic Univerisity of Korea Seoul St Mary's hospital
name: Yong In, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References: