An observational study in Total Knee Arthroplasty, sponsored by Medacta International SA. Recruiting at 1 site in Australia. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-09-29.
Sponsored by Medacta International SA · Observational
This study titled "Does Personalised Soft Tissue Balance Data Improve Outcomes in Patients Undergoing Medially Stabilised Arthroplasty? A Prospective, Randomised Study Investigating the Clinical Utility of the NextAR navigation system (NextAR)" is a randomised, single blinded, prospective cohort study with the primary aim determine the clinical utility of the NextAR system data in providing soft tissue balance patterns to enable prosthesis implants to resemble more native knee alignment.
This study titled "Does Personalised Soft Tissue Balance Data Improve Outcomes in Patients Undergoing Medially Stabilised Arthroplasty? A Prospective, Randomised Study Investigating the Clinical Utility of the NextAR navigation system (NextAR)" is a randomised, single blinded, prospective cohort study with the primary aim determine the clinical utility of the NextAR system data in providing soft tissue balance patterns to enable prosthesis implants to resemble more native knee alignment.
The aims of this study are:
According to study protocol, clinical evaluation is performed preoperatively and postoperatively at 6 weeks, 6 months, 1, and 2 years with the use of the Forgotten Joint Score (FJS), Oxford Knee Score (OKS), International Knee Documentation Committee (IKDC) and European Quality of Life Five Dimensions - Five Levels (EQ5D-5L).
CT scan is performed preoperatively and at 6-weeks after surgery, while X-ray assessment is performed at baseline and at the 1-year follow up.
The trial will include two groups of 50 patients in each group. This is based on a power calculation assuming a difference in Forgotten Join Score of greater than 5 points. This calculation allows for a loss to follow-up of 10%. The study will conclude once the patients involved have completed 2 years of follow-up.
Exclusion Criteria:
patients will be operated with conventional instrumentation
Device: Implantation of GMK Sphere with conventional instrumentation
patients will be operated using the NextAR guidance system
Device: Implantation of GMK Sphere using the NextAR guidance system
Implantation of GMK Sphere with conventional instrumentation (control group)
Implantation of GMK Sphere using the NextAR guidance system (NextAR group)
Determine whether NextAR system data contributes to change patient outcomes using the Forgotten Joint Score
To determine whether NextAR system data contributes to change patient outcomes using the Forgotten Joint Score \- Forgotten Joint Score measures the patient's ability to forget about the joint as a result of successful treatment and is based on the premise that the best arthroplasty is one the patient forgets. This score goes from a minimum of 0 to a maximum of 100 points.
Time frame: pre-op, 6 weeks, 6 months, 1 year, 2 years
To determine whether NextAR system data contributes to change patient outcomes using the EQ5D-5L
To determine whether NextAR system data contributes to change patient outcomes using the EQ5D-5L The EQ5D-5L comprises of 6 questions survey that measures generic health-related quality of life. This score goes from a minimum of 0 to a maximum of 1 points.
Time frame: pre-op, 6 weeks, 6 months, 1 year, 2 years
Determining the kinematics of the replaced knee as measured by 3D gait analysis.
The purpose of the gait analysis will be to assess the variation in kinematics between the patients replaced knee (in both study groups) compared to normal knee kinematic data reported in the literature. The hypothesis being tested is that alteration of component position to give more normal ligament tension, will more resemble normal knee kinematics. (n=20) will be sufficient to conduct the gait analysis. These patients will be selected from the overall cohort for enrolment at 12 months post-surgery and matched for age, gender, BMI and osteoarthritis pattern. The comparison will involve comparing the average kinematic data values obtained in group 1 (NextAR data provided at surgery) vs the reported values in the literature and the same analysis will be repeated for patients in group 2 (NextAR data not provided at surgery).comparison will be made between the two groups in terms of which more closely replicates the kinematics of the non-arthritic knee
Time frame: pre-op, 1 year
To determine whether NextAR system data contributes to change patient outcomes using the Oxford Knee Score
To determine whether NextAR system data contributes to change patient outcomes using the Oxford Knee Score the Oxford Knee Score is a questionnaire that has been specifically developed to assess knee function and pain. It is short, reproducible and extensively referenced in orthopaedic literature, making it a preferred tool for studies. This score goes from a minimum of 0 to a maximum of 48 points.
Time frame: pre-op, 6 weeks, 6 months, 1 year, 2 years
To determine whether NextAR system data contributes to change patient outcomes using the Forgotten Joint Score using the International Knee Documentation Committee
To determine whether NextAR system data contributes to change patient outcomes using the Forgotten Joint Score using the International Knee Documentation Committee International Knee Documentation Committee is questionnaire that evaluates physical activity, level of pain and knee functionality in sporting activities. This score goes from a minimum of 0 to a maximum of 100 points.
Time frame: pre-op, 6 weeks, 6 months, 1 year, 2 years
Plan to share: No
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Medacta International SA