Can a new Slow-Release ibuprofen tame knee arthritis pain for 12 hours?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Male and female patients ≥18 years of age at the screening visit. 2. Patients diagnosed with symptomatic OA of the knee based on the American College of Rheumatology (ACR) clinical criteria and have an American Rheumatology Association (ARA) functional class rating of I, II, or III (1), for ≥ 3 months prior to date of screening; with recent (≤ 6 months) radiographic evidence of tibiofemoral OA: ≥ Grade 2 on the Kellgren \& Lawrence scale. (In cases where both knees are affected, the most painful knee joint is selected as the target knee for study evaluation). 3. Patients had been prescribed NSAIDs or acetaminophen to treat their OA-related pain for at least 3 months prior to the screening visit. 4. Following discontinuation of analgesic medication (a washout period of at least 5 times the half-life (prior to Day -7), plus a subsequent additional 7 days prior to Baseline visit (Day -7 to Day-1), patients must have a reported pain score of at least 40 mm for WOMAC Pain intensity question: 'walking on a flat surface' at Baseline Visit. 5. Subjects are willing to comply with protocol-stated requirements, instructions and restrictions, followed by understanding and signing the written informed consent form or legal representative if he/she is under the statutory age of consent as per the local authority. Exclusion Criteria: 1. Patients with a history of gastroduodenal perforations and/or obstructions; gastric and/or duodenal surgery; recent (≤ 6 months) active gastrointestinal (GI) ulceration; inflammatory bowel disease; GI bleeding in the past year. 2. Patients with a history of congestive heart failure, coronary artery disease, renal artery stenosis or recent (within 1 year) myocardial infarction, angina, stroke, or transient ischemic attack and/or with uncontrolled hypertension. 3. Patients with moderate to severe hepatic impairment (alanine aminotransferase \[ALT\] or aspartate transaminase \[AST\] concentrations \> 2.5 times the upper limit of normal). 4. Patients with a medical condition (e.g., a cardiovascular, pulmonary, hepatic, renal, hematologic, gastrointestinal, endocrine \[adrenal hyperplasia\], immunologic, dermatologic, neurologic, oncologic, or psychiatric) or a significant laboratory abnormality that, in the Investigator's opinion, would jeopardize the safety of the patient or is likely to confound the study measurements. 5. Patients receiving ongoing opioid therapy for their OA-related pain; or requiring ongoing use of analgesic therapy for other indications, anticoagulants, psychotherapeutic agents, aspirin at daily doses greater than 325 mg, statin-class hypolipidemic agents at doses that have not been stabilized, or other treatments known to interfere with pain perception. (Note: 'stabilized' is defined as being used for at least 3 months). 6. Patients who have received intra-articular injection of corticosteroids, hyaluronic acid or platelet-rich plasma in the target knee within 6 months prior to the screening visit (within 1 year for long-acting formulations); or have received opioid medication within 14 days prior to the screening visit. 7. Patients who are unable to be prescribed NSAIDs or are known or suspected to have hypersensitivity to study medication or their excipients. 8. Patients who have participated in investigational drug trials and took any investigational therapy within 90 days or a time of 5 half-lives prior to the study dosing. 9. Patients currently pregnant, lactating, or planning to pregnant during the trial period. All male patients and female patients with child-bearing potential (between puberty and 2 years after menopause) should use at least any one of the appropriate contraception methods mentioned below, during dosing and for at least 4 weeks after stopping study treatment. * Total abstinence (when this is in line with the preferred and usual lifestyle of the subject). Periodic abstinence (e.g., calendar, ovulation, symptothermal, post-ovulation methods) and withdrawal are not acceptable methods of contraception. * Female sterilization (have had surgical bilateral oophorectomy with or without hysterectomy), total hysterectomy, or tubal ligation at least 6 weeks before taking study treatment. In case of oophorectomy alone, only when the reproductive status of the woman has been confirmed by follow up hormone level assessment. * Male sterilization (at least 6 months prior to screening). For female subjects on the study, the vasectomized male partner should be the sole partner for that subject. * Combination of any two of the following listed methods: (a+b or a+c, or b+c): 1. Use of oral, injected or implanted hormonal methods of contraception or other forms of hormonal contraception that have comparable efficacy (failure rate \<1%), for example hormone vaginal ring or transdermal hormone contraception. 2. Placement of an intrauterine device (IUD) or intrauterine system (IUS). 3. Barrier methods of contraception: Condom or Occlusive cap (diaphragm or cervical/vault caps) with spermicidal foam/gel/film/cream/vaginal suppository. 10. Subjects with underlying medical, mental, psychological, or other inappropriate conditions that would impair treatment compliance, or in the opinion of the Investigator would not permit to participate in the study.