Daily Activity and Clinical Outcome Measurement of Arthrosamid® Administration in Symptomatic Knee Osteoarthritis. (ACTA)

Evaluation of Daily Activity and Clinical Outcomes After a Single, Intra-articular, Injection of Arthrosamid® in Patients With Symptomatic Knee Osteoarthritis: a Monocentric Trial With a 12-month Follow-up Period

This study is a prospective, monocentric, interventional post-market study evaluating the effects of a single intra-articular injection of Arthrosamid in patients with symptomatic knee osteoarthritis. Arthrosamid is a polyacrylamide hydrogel consisting of 97.5% sterile water and 2.5% cross-linked polyacrylamide that integrates into the synovial tissue and is used for the symptomatic treatment of knee osteoarthritis.

The study will include 30 eligible patients receiving a single Arthrosamid injection and will be followed for up to 12 months. The primary objective is to evaluate the performance of Arthrosamid in terms of daily activities and clinical outcomes in patients with symptomatic knee osteoarthritis. The primary endpoint assesses the percentage change from baseline in daily activity levels at 6 months after injection, measured using an activity tracker combined with a digital rehabilitation tool. Additional assessments include patient-reported outcome measures and clinical follow-up visits conducted as part of standard care.

Study Overview

• Status: Active, not recruiting
• Conditions: Knee Osteoarthristis
• Intervention / Treatment: Device: Arthrosamid

• Study Type: Interventional
• Enrollment (Actual): 29
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Belgium
  • Oost-Vlaanderen
    • Sint-Martens-Latem, Oost-Vlaanderen, Belgium, 9830
      • Medisch Centrum Latem

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Subjects > 18 years of age at the time of injection

• Advanced osteoarthritis, involving one or multiple of the following phenotypes: tricompartmental osteoarthritis, isolated or severe patella-femoral osteoarthritis, and/or a Kellgren and Lawrence grade II or III classification:

  • Patellofemoral osteoarthritis referring to symptoms, including pain, that are principally of patellofemoral origin (Patellar syndrome).
  • Radiological Kellgren and Lawrence grade II to III from a standing knee radiograph taken less than 6 months previously.
• Subjects with a normal BMI ≥ 18.5 kg/m² and < 30 kg/m²
• Symptomatic osteoarthritis diagnosed via radiographic assessment and according to the clinical and radiological criteria of the American College of Rheumatology
• Fully ambulatory patient for functional evaluation.
• Able to understand and follow the instructions of the study.
• Having signed a written informed consent

Exclusion Criteria:

• Meeting one of the following contraindications as stated in the instructions for use (IFU) of Arthrosamid®:

  • If an active skin disease or infection is present at or near the injection site
  • If the joint is infected or severely inflamed
  • If a degradable intra-articular injectable such as hyaluronic acid is present, it must be expected to be absorbed according to the manufacturer's information for the specific product, before injection with Arthrosamid®
• Other medical conditions contributing to the rehabilitation process of the injection according to the surgeon
• Important medical conditions such as, Parkinson's Disease, dementia, multiple sclerosis and cerebral vascular accident, which can disturb the patient's rehabilitation after injection according to the surgeon
• Patient is participating in another clinical trial or has participated in a clinical trial in the last three months
• Patients who did not met all the inclusion criteria

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Arthrosamid Injection; Patients with symptomatic knee osteoarthritis receiving a single intra-articular injection of Arthrosamid and followed for clinical outcomes and activity levels for up to 12 months.	Device: Arthrosamid; Single intra-articular injection of Arthrosamid, a polyacrylamide hydrogel consisting of 97.5% sterile water and 2.5% cross-linked polyacrylamide, administered for the symptomatic treatment of knee osteoarthritis.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Percentage Change From Baseline in Daily Activity Levels	Percentage change from baseline in daily activity levels at 6 months after a single intra-articular Arthrosamid injection, measured using an activity tracker coupled with a digital rehabilitation tool.	6 months follow-up

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Percentage Change From Baseline in Daily Activity Levels	Percentage change from baseline in daily activity levels at 12 months after a single intra-articular Arthrosamid injection, measured using an activity tracker coupled with a digital rehabilitation tool.	12 months follow-up
Change From Baseline in Patient-Reported Outcome Measures	Absolute and percentage change from baseline in patient-reported outcome measures (PROMs), including KOOS (total and subscales), Oxford Knee Score, Forgotten Joint Score (FJS), EQ-5D, UCLA Activity Score, and the moveUP index score, in patients with symptomatic knee osteoarthritis treated with Arthrosamid.	7 to 14 days before injection, Day 0 (baseline), 2 weeks, 6 weeks, 3 months, 6 months, and 12 months follow-up

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Rescue Medication Consumption	Consumption of concomitant or rescue medication in patients with symptomatic knee osteoarthritis following a single intra-articular Arthrosamid injection, assessed at multiple follow-up time points.	2 weeks, 6 weeks, 3 months, 6 months, and 12 months follow-up

Collaborators and Investigators

• Sponsor: Medisch Centrum Latem
• Collaborators: Contura

Study record dates

Study Major Dates

• Study Start (Actual): July 25, 2024
• Primary Completion (Estimated): January 31, 2027
• Study Completion (Estimated): January 31, 2027

Study Registration Dates

• First Submitted: March 6, 2026
• First Submitted That Met QC Criteria: March 6, 2026
• First Posted (Actual): March 12, 2026

Study Record Updates

• Last Update Posted (Actual): March 12, 2026
• Last Update Submitted That Met QC Criteria: March 6, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Keywords: Knee Osteoarthritis; Activity Monitoring; Intra-Articular Injection; Arthrosamid; Polyacrylamide Hydrogel
• Additional Relevant MeSH Terms: Musculoskeletal Diseases; Arthritis; Joint Diseases; Rheumatic Diseases; Osteoarthritis; Osteoarthritis, Knee
• Other Study ID Numbers: BUN3002024000098; 6568 (Other Identifier: Ethics Committee UZA/UAntwerpen)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No