A Long-Term, Placebo-Controlled X-Ray Study Investigating the Safety and Efficacy of SD-6010 in Subjects With Osteoarthritis of the Knee

The WOMAC was a self-administered, disease-specific instrument which probed clinically important, participant relevant symptoms in the areas of pain, stiffness, and physical function in participants with OA of the knee. The WOMAC composite index was the sum of 24 individual questions regarding subscales of pain, stiffness and physical function (for each item score range: 0 [minimum] to 4 [maximum], higher score indicating worse knee condition). Total score was sum of the 3 subscale scores, giving a possible overall score range of 0 (minimum) to 96 (maximum). Higher score indicating the worse level of pain, stiffness and physical function.

The WOMAC pain subscale was comprised of 5 questions regarding the amount of pain experienced due to OA in the study knee. The WOMAC pain subscale score for each question ranged from 0 (minimum) to 4 (maximum), higher scores signified worse pain. An overall subscale score range of 0 (minimum) to 20 (maximum), with higher scores indicating more pain.

Stiffness was defined as a sensation of decreased ease in which the participant moved the knee with OA. The WOMAC stiffness subscale was comprised of 2 questions regarding the degree of stiffness experienced in the study knee. The WOMAC stiffness subscale score for each question ranged from 0 (minimum) to 4 (maximum), higher scores signified worse stiffness. An overall score range of 0 (minimum) to 8 (maximum), with higher scores indicating more stiffness.

The WOMAC physical function subscale referred to the participant's ability to move around and perform usual activities of daily living. The WOMAC physical function subscale was comprised of 17 questions regarding the degree of difficulty experienced due to OA in the study knee. The WOMAC physical function subscale score for each question ranged from 0 (minimum) to 4 (maximum), higher scores signified worse physical function. An overall score range of 0 (minimum) to 68 (maximum), with higher scores indicating worse physical function.

Pain VAS was a self-administered instrument, a 100 millimeter (mm) line marked by participant. Intensity of pain range (over past week): 0 (mm) =no pain to 100 (mm) =worst possible pain. Higher score indicating severe pain.

Participants answered: "Considering all the ways your arthritis affects you, how are you feeling today?" Participants responded by using the scale ranging from 1 (minimum) to 5 (maximum), where 1 =very good, 2 =good, 3 =fair, 4 =poor and 5 =very poor. Higher scores indicating worse condition.

Physician assessed the overall impact of arthritis on the participant's daily life. Participant's condition was rated by the physician using the scale ranging from 1 (minimum) to 5 (maximum), where 1= very good, 2= good, 3= fair, 4= poor and 5= very poor. Higher scores indicating worse condition.

The pain VAS following a 50 foot walk was a single-item, self-administered instrument. Participants were asked to assess the pain due to OA in their study knee after a 50-foot walk. Participants responded on a VAS scale ranging from 0 (no pain) to 100 (severe pain). Higher scores indicating more pain.

The OA pain and assessment tool-knee joint is also known as the intermittent and constant osteoarthritis pain (ICOAP) scale. The OA pain assessment tool-knee joint was an 11-item scale, with each item scored from 0 (minimum) to 4 (maximum), where 4 indicated worst health condition. The total score was calculated by adding the 11 items and rescaled to a 0 (minimum) to 100 (maximum) scale, where higher scores indicating worse health.

The OA pain assessment tool-knee joint constant pain subscale was a 5 item scale, with each item scored from 0 (minimum) to 4 (maximum), where 4 indicated worst health condition. Overall subscale score was calculated by adding the 5 items and rescaled to a 0 (minimum) to 100 (maximum) scale, where higher scores indicating worse constant pain.

The OA pain assessment tool-knee joint intermittent pain subscale score a 6 item scale, with each item scored from 0 (minimum) to 4 (maximum), where 4 indicated worst health condition. Overall subscale score was calculated by adding the 6 items and rescaled to a 0 (minimum) to 100 (maximum) scale, where higher scores indicating worse intermittent pain.

The OARSI knee function survey was an 11-item scale with each item scored 0 (minimum) to 4 (maximum), where 4 indicated worst health condition. The total score was the sum of the 11 items and ranged from 0 (minimum) to 44 (maximum), where higher scores indicating worse health condition.

The KOOS-PS was used to rate participant's opinions about the difficulties they experienced with activity due to problems with their knee. It was a 7-item scale, each item scored from 0 (minimum) to 4 (maximum), where 4 indicated worst health condition. Total score was calculated by adding the responses to 7 items and rescaled to a 0 (minimum) to 100 (maximum) scale, where higher scores indicating worse health condition.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 16.18 (minimum) to 57.11 (maximum), with higher scores indicating better physical functioning.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 18.45 (minimum) to 56.62 (maximum), with higher scores indicating better role-physical.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 19.23 (minimum) to 60.88 (maximum), with higher scores indicating lower bodily pain.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 16.75 (minimum) to 63.72 (maximum), with higher scores indicating better general health.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 22.02 (minimum) to 69.92 (maximum), with higher scores indicating better vitality.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 13.38 (minimum) to 56.40 (maximum), with higher scores indicating better social functioning.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 10.25 (minimum) to 55.68 (maximum), with higher scores indicating better role-emotional.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 8.02 (minimum) to 63.43 (maximum), with higher scores indicating better mental health.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 22.88 (minimum) to 58.69 (maximum), with higher scores indicating better physical health.

The SF-36 was a participant administered scale assessing general quality of life. It consisted of self-administered 36-item questionnaire that measured 8 health domains: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. These 8 domains were also summarized as physical and mental component scores. The score for each domain and component score was the mean of the individual question scores, which were scaled from 0 (minimum) to 100 (maximum), where higher scores indicated highest level of health/functioning. Linear transformations were performed to transform scores and rescaled to a score range of 11.11 (minimum) to 61.67 (maximum), with higher scores indicating better mental health.

EQ-5D: participant rated questionnaire to assess health-related quality of life. Health state profile component assessed level of current health for 5 domains: mobility, self-care, usual activities, pain and discomfort, anxiety and depression. EQ-5D mobility domain score scale ranged from 1 (minimum) to 3 (maximum), where 1 =better health (no problem), 2 =moderate health (some problems) and 3 =worst health (confined to bed). Higher scores indicating worse health condition. Participants with EQ-5D mobility domain score were reported in this measure.

EQ-5D: participant rated questionnaire to assess health-related quality of life. Health state profile component assessed level of current health for 5 domains: mobility, self-care, usual activities, pain and discomfort, anxiety and depression. EQ-5D self-care domain score scale ranged from 1 (minimum) to 3 (maximum), where 1 =better health (no problems with self-care), 2 =moderate health (some problems) and 3 =worst health (unable to wash or dress). Higher scores indicating worse health condition. Participants with EQ-5D self-care domain score were reported in this measure.

EQ-5D: participant rated questionnaire to assess health-related quality of life. Health state profile component assessed level of current health for 5 domains: mobility, self-care, usual activities, pain and discomfort, anxiety and depression. EQ-5D usual activity domain score scale ranged from 1 (minimum) to 3 (maximum), where 1 =better health (no problems), 2 =moderate health (some problems) and 3 =worst health state (unable to perform usual activities). Higher scores indicating worse health condition. Participants with EQ-5D usual activity domain score were reported in this measure.

EQ-5D: participant rated questionnaire to assess health-related quality of life. Health state profile component assessed level of current health for 5 domains: mobility, self-care, usual activities, pain and discomfort, anxiety and depression. EQ-5D pain and discomfort domain score scale ranged from 1 (minimum) to 3 (maximum), where 1 =better health (no pain and discomfort), 2 =moderate health (moderate pain and discomfort) and 3 =worst health state (extreme pain and discomfort). Higher scores indicated worse health condition. Participants with EQ-5D pain and discomfort domain score were reported in this measure.

EQ-5D: participant rated questionnaire to assess health-related quality of life. Health state profile component assessed level of current health for 5 domains: mobility, self-care, usual activities, pain and discomfort, and anxiety and depression. EQ-5D anxiety and depression domain score scale ranged from 1 (minimum) to 3 (maximum), where 1 =better health (not anxious, depressed), 2 =moderate health (moderately anxious, depressed) and 3 =worst health (extremely anxious, depressed). Higher scores indicating worse health condition. Participants with EQ-5D anxiety and depression domain score were reported in this measure.

The EQ-5D VAS score was a participant rated questionnaire to assess health-related quality of life in terms of a single index value. It was a visual analogue scale that ranged from 0 (minimum) to 100 (maximum), with higher scores indicating a better health condition.

Increase in total analgesic medication use for OA in the study knee was a comparison back to baseline of an increased and sustained use of standard background and/or rescue medication for more than 28 days as measured at the Month 12 and 24 visits. Only medications for OA knee pain were considered.

Decrease in total analgesic medication use for OA in the study knee was a comparison back to baseline of a decreased and irregular use of standard background and/or rescue medication for more than 28 days as measured at the Month 12 and 24 visits. Only medications for OA knee pain were considered.

Patient global impression of change was a participant-rated instrument that measured change in participant's overall status on a 7-point scale ranging from: 1 =very much improved, 2 =much improved, 3 =minimally improved, 4 =no change, 5 =minimally worse, 6 =much worse and 7 =very much worse. Higher scores indicating worse condition.

The OMERACT-OARSI responder index was used to determine whether participants may be considered responders to treatment. An OMERACT-OARSI responder was a participant who had a better response on the WOMAC pain subscale score, a better response on the WOMAC physical function subscale score or improvement on at least two of the three domains: WOMAC pain subscale score (overall score range of 0 [minimum] to 20 [maximum], higher scores indicating more pain), WOMAC physical function subscale score (overall score range of 0 [minimum] to 68 [maximum], higher scores indicating worse physical function) and patient global assessment of arthritic condition score (overall score range of 1 [minimum] to 5 [maximum], higher scores indicating worse condition). Number of participants who were OMERACT-OARSI responder were reported in this measure.

JSN progressor was defined as a participant with a decrease in joint space width that was greater in magnitude than the smallest detectable difference (0.199 mm).

A virtual joint replacement candidate was defined as a participant whose last two WOMAC pain subscale scores (overall score range of 0 [minimum] to 20 [maximum], higher scores indicating more pain) were at least 8, last two WOMAC physical function subscale scores (overall score range of 0 [minimum] to 68 [maximum], higher scores indicating worse physical function) were at least 28 and was a joint space narrowing progressor (a participant with a decrease in JSW that was greater in magnitude than the smallest detectable difference =0.199 mm).