Study of FLEXISEQ® for Treatment of Osteoarthritis of the Knee in NSAID-compromised Patients

Inclusion Criteria: 1. Signed and dated informed consent prior to any study-mandated procedure 2. Willing and able to comply with study requirements 3. Outpatients with an age ≥ 50 (starting from the day after the 50th birthday) 4. Patient for whom their knee pain is the worst pain in the body and is able to identify the predominantly painful (target) knee 5. Patient has a primary diagnosis of Functional Class I-III OA of the target knee and patient meets American College of Rheumatology (ACR) clinical classification criteria for osteoarthritis of the knee 6. NSAID contraindicated or clinically intolerant 7. Females able to conceive (including peri-menopausal women who have had a menstrual period within 1 year) must be using appropriate birth control (defined as a method which results in a low failure rate 8. If female and able to conceive, patient has a negative urine pregnancy test at screening Exclusion Criteria: * General exclusion criteria 1. Planned treatment or treatment with another investigational drug within 30 days prior to randomisation 2. Patients who are inmates of psychiatric wards, prisons, or other state institutions 3. Investigator or any other team member involved directly or indirectly in the conduct of the clinical study 4. Pregnancy or lactation 5. Any planned or expected hospitalisation within the study period 6. Patients not able to perform the WOMAC test (physically handicapped or immobile patient, e.g. wheel-chair bound) 7. Any health condition which, in the investigator's opinion means the patient is likely to be unable to complete the 12 week study Medical history related exclusion criteria 8. Skin lesions or dermatological diseases in the treatment area 9. Extreme obesity (BMI \> 35) 10. Uncontrolled hypertension 11. Requiring dialysis 12. Hepatocellular insufficiency preventing use of paracetamol 13. Alcohol abuse 14. Intolerance to paracetamol 15. Malignancy within the past 2 years 16. Morbus Meulengracht/Gilbert Syndrome 17. Neurological or psychiatric disorders compromising pain rating by the patient, such as but not limited to depressive disorders, schizophrenia or epilepsy 18. Any other pain condition requiring acute or chronic use of pain medication that cannot be discontinued at screening 19. Inflammatory arthritis including rheumatoid arthritis, psoriatic arthritis, gout, pseudo gout, systemic lupus erythematodes, ankylosing spondylitis, mixed connective tissue disease 20. Symptomatic hip OA ipsilateral to the target knee 21. Severe (axial misalignment \> 10°), uncorrected genu vara and genu valga 22. Arthroscopy of the target knee within 6 months prior or during the study