A Pilot Study Assessing the Treatment Responsiveness of a Novel Osteoarthritis Stiffness Scale

Osteoarthritis is a common, chronic, progressive, skeletal, degenerative disorder that frequently affects several joints such as knee, hip, spine and hands.This placebo-controlled clinical trial assessed the effects of naproxen sodium, acetaminophen and celecoxib on stiffness in subjects with osteoarthritis.

The primary objective of the study was to assess the responsiveness of the Brief Arthritis Stiffness Scale (BASS) for detecting treatment effects of common over-the-counter (OTC) analgesics and a common prescription analgesic in subjects with knee osteoarthritis.

Participants received naproxen 660 mg daily for 3 days and 440 mg on the fourth day; followed by placebo for 4 days; followed by celecoxib 200 mg daily for 3 days and 100 mg on the fourth day; followed by acetaminophen 3900 mg daily for 3 days and 1300 mg on the fourth day. Treatment periods were separated by a washout period of 3 to 7 days.

Participants received acetaminophen 3900 mg daily for 3 days and 1300 mg on the fourth day; followed by celecoxib 200 mg daily for 3 days and 100 mg on the fourth day; followed by placebo for 4 days; followed by naproxen 660 mg daily for 3 days and 440 mg on the fourth day. Treatment periods were separated by a washout period of 3 to 7 days.

Participants received celecoxib 200 mg daily for 3 days and 100 mg on the fourth day; followed by naproxen 660 mg daily for 3 days and 440 mg on the fourth day; followed by acetaminophen 3900 mg daily for 3 days and 1300 mg on the fourth day; followed by placebo for 4 days. Treatment periods were separated by a washout period of 3 to 7 days.

Participants received placebo for 4 days; followed by acetaminophen 3900 mg daily for 3 days and 1300 mg on the fourth day; followed by naproxen 660 mg daily for 3 days and 440 mg on the fourth day; followed by celecoxib 200 mg daily for 3 days and 100 mg on the fourth day. Treatment periods were separated by a washout period of 3 to 7 days

3900 mg daily for 3 days, 1300 mg on the fourth day, over-encapsulated extended release (ER) tablet, oral (Treatment B)

Brief Arthritis Stiffness Scale (BASS) is a patient-reported outcome (PRO) instrument measuring of the severity of osteoarthritis-related stiffness in the target knee joint. The BASS score ranges from 0 to 40 and a higher score indicates worse stiffness. This endpoint was calculated by summing the changes from baseline (CFB) in BASS scores at Days 2, 3, and 4 of the treatment periods.

Brief Arthritis Stiffness Scale (BASS) is a patient-reported outcome (PRO) instrument measuring of the severity of osteoarthritis-related stiffness in the target knee joint. The BASS score ranges from 0 to 40 and a higher score indicates worse stiffness.

Brief Arthritis Stiffness Scale (BASS) is a patient-reported outcome (PRO) instrument measuring of the severity of osteoarthritis-related stiffness in the target knee joint. The BASS score ranges from 0 to 40 and a higher score indicates worse stiffness.

Inclusion Criteria: Age between 40 and 80 years Body Mass Index (BMI) between 18 and <40 kg/m^2 Unilateral or bilateral osteoarthritis of the knee Diagnostic quality radiography of the target knee performed no more than 1 year prior to baseline showing evidence of osteoarthritis (OA) with Kellgren and Lawrence grade of II or III Joint Stiffness Severity score ≥3.0 on a 0-10 numerical rating scale (NRS) at screening Exclusion Criteria: History of underlying inflammatory arthropathy, rheumatoid arthritis or fibromyalgia History of or scheduled for target knee replacement surgery Recent injury in target knee (past 4 months)

Availability of this study's data will be determined according to Bayer's commitment to the EFPIA/PhRMA "Principles for responsible clinical trial data sharing". This pertains to scope, timepoint and process of data access. As such, Bayer commits to sharing upon request from qualified researchers patient-level clinical trial data, study-level clinical trial data, and protocols from clinical trials in patients for medicines and indications approved in the US and EU as necessary for conducting legitimate research. This applies to data on new medicines and indications that have been approved by the EU and US regulatory agencies on or after January 01, 2014. Interested researchers can use www.clinicalstudydatarequest.com to request access to anonymized patient-level data and supporting documents from clinical studies to conduct research. Information on the Bayer criteria for listing studies and other relevant information is provided in the Study sponsors section of the portal.