A diary was used in the study to capture daily worst shoulder pain intensity over a 7-day period. The diary included a pain intensity question asked each day to the subject. The pain intensity question is excerpted from the Brief Pain Inventory - Short Form Question 3 (BPI-3) and is stated as "please rate your pain by circling the one number that best describes your pain at its worst in the last 24 hours". BPI-3 is a scale of 0 to 10 where 0 represents no pain and 10 represents worst pain. The median scores were calculated for each diary period. The median diary score at End of Treatment (EOT) was compared to the median baseline diary score to calculate the change in pain intensity. The group mean of the median scores for treatment was compared to the group mean of the medians scores for the control group at baseline and at EOT.

Full analysis set

At each study visit following the baseline assessment, subjects were questioned if any changes in their medical status or condition had occurred. If the change was an adverse event, an adverse event form was completed by the site.

Safety set

The degree to which shoulder pain interferes with daily activities was assessed using Question 9 of the Brief Pain Inventory (BPI-9) collected from the BPI Short Form administered during clinic visits. This question asks the subject to rate the degree to which their pain has interfered with general activity, mood, walking ability, normal work, relations with other people, sleep, and enjoyment of life on a scale of 0 to 10, where 0 is "does not interfere" and 10 is "completely interferes" within the last week. The mean of these seven scores will be calculated to obtain the pain interference score.

Per protocol set (Subjects in the full analysis set who also were implanted with a Smartpatch Lead, had an adequate number of worst pain intensity (BPI3) scores in the End of Treatment subject diary period, and continued to meet all eligibility criteria throughout treatment).

A diary was used in the study to capture daily worst shoulder pain intensity over a 7-day period. The diary included a pain intensity question asked each day to the subject. The pain intensity question is excerpted from the Brief Pain Inventory - Short Form Question 3 (BPI-3) and is stated as "please rate your pain by circling the one number that best describes your pain at its worst in the last 24 hours". BPI-3 is a scale of 0 to 10 where 0 represents no pain and 10 represents worst pain. The median scores were calculated for each diary period. The median diary score at 12 weeks post-treatment was compared to the median baseline diary score to calculate the change in pain intensity. The group mean of the median scores for 12 weeks post-treatment was compared to the group mean of the median scores for the control group at baseline.

Full analysis set

The Medical Outcomes Study Short Form (SF-36v2) was administered at clinic visits to assess the impact of peripheral nerve stimulation on the subject's health-related quality of life. The SF-36v2 is a generic health survey designed to assess basic physical functioning and emotional well-being regardless of the disease or treatment. The 36 questions were grouped into two components: physical and mental. The survey was scored using norm-based scoring algorithm where a score of 0 indicates maximum disability and a score of 100 indicates no disability. Change in each component score was derived from End of Treatment score minus baseline score.

Per protocol set (Subjects in the full analysis set who also were implanted with a Smartpatch Lead, had an adequate number of worst pain intensity (BPI3) scores in the End of Treatment subject diary period, and continued to meet all eligibility criteria throughout treatment)

A diary was used in the study to capture daily average shoulder pain intensity over a 7-day period. The diary included a pain intensity question asked each day to the subject. The pain intensity question is excerpted from the Brief Pain Inventory - Short Form Question 5 (BPI-5) and is stated as "please rate your pain by circling the one number that best describes your pain on the average". BPI-5 is a scale of 0 to 10 where 0 represents no pain and 10 represents worst pain. The mean scores were calculated for each diary period. The mean diary score at End of Treatment (EOT) was compared to the mean baseline diary score to calculate the change in pain intensity.

Per protocol set (Subjects in the full analysis set who also were implanted with a Smartpatch Lead, had an adequate number of worst pain intensity (BPI3) scores in the End of Treatment subject diary period, and continued to meet all eligibility criteria throughout treatment)

The Patient Global Impression of Change (PGIC) scale was administered at EOT to assess subject perception of overall improvement and patient preferences. The PGIC scale asks subjects to rate their improvement with treatment on a 7-point scale (centered at 4) that ranges from "very much worse" to "very much improved" relative to baseline.

Per protocol set (Subjects in the full analysis set who also were implanted with a Smartpatch Lead, had an adequate number of worst pain intensity (BPI3) scores in the End of Treatment subject diary period, and continued to meet all eligibility criteria throughout treatment)

Subjects completed 7-day diaries, in which they listed all pain medications they took during the 7 days. A blinded third party medication committee reviewed medications collected for each 7-day diary period and scored medication changes, in comparison to the baseline diary medications as "no change" (no change in dosage or change is not clinically meaningful to impact pain outcomes), "increase" (clinically meaningful increase in medication that would impact pain outcomes), or "decrease" (clinically meaningful decrease in medication that would impact pain outcomes).

Per protocol set (Subjects in the full analysis set who also were implanted with a Smartpatch Lead, had an adequate number of worst pain intensity (BPI3) scores in the End of Treatment subject diary period, and continued to meet all eligibility criteria throughout treatment)

The Blinded Evaluator rated each subject enrolled at their site using a question adapted from the Clinical Global Impression (CGI) scale, known as the Clinical Global Impression-Improvement scale (CGI-I). For the CGI-I, a Blinded Evaluator was asked to rate the subject's total improvement compared to their condition at baseline. The CGI-I uses a 7-point scale (centered at 4) that ranges from "very much worse" to "very much improved".

Per protocol set (Subjects in the full analysis set who also were implanted with a Smartpatch Lead, had an adequate number of worst pain intensity (BPI3) scores in the End of Treatment subject diary period, and continued to meet all eligibility criteria throughout treatment). The CGI-I was not completed for one subject in the treatment group.

Subjects completed the sponsor-developed Subject Satisfaction Survey at the End of Treatment (EOT) visit. The results of these surveys demonstrate the usability of the Smartpatch System and subject satisfaction with treatment.

Safety set (Subjects who were implanted with a Smartpatch Lead)

Subjects completed the sponsor-developed Subject Satisfaction Survey at the end of the 12-week post-treatment period. The results of these surveys demonstrate the usability of the Smartpatch System and subject satisfaction with treatment.

Safety set (Subjects who were implanted with a Smartpatch Lead)

A sponsor-developed Clinician Satisfaction Survey was administered to the Investigator(s) at each site performing lead placement and included questions pertaining to use of the Smartpatch device as well as the overall impression of the therapy.

"Count of participants" represents Investigators responding to the survey rather than study participants.

Subjects who reported an reduction of at least 30% in either pain intensity or pain interference from baseline to End of Treatment (EOT) using the Brief Pain Inventory (BPI) Short Form.

The pain intensity score is excerpted from BPI question 3, worst pain, taken from 7-day diaries. This scale ranges from 0 representing no pain to 10 representing worst pain. The median diary score at EOT was compared to the median baseline diary score to calculate the percentage of subjects who had at least a 30% reduction in pain intensity.

Pain interference was assessed using BPI question 9. Subjects rated the degree to which their pain interfered with seven facets of daily life on a scale of 0 to 10, where 0 is "does not interfere" and 10 is "completely interferes". The mean of these 7 scores was calculated to obtain the pain interference score. The score at EOT was compared to the baseline score to determine the percentage of subjects who had at least a 30% reduction in pain interference.

Per protocol set (Subjects in the full analysis set who also were implanted with a Smartpatch Lead, had an adequate number of worst pain intensity (BPI3) scores in the End of Treatment subject diary period, and continued to meet all eligibility criteria throughout treatment)

The degree to which shoulder pain interferes with daily activities was assessed using Question 9 of the Brief Pain Inventory (BPI-9) collected from the BPI Short Form administered during clinic visits. This question asks the subject to rate the degree to which their pain has interfered with general activity, mood, walking ability, normal work, relations with other people, sleep, and enjoyment of life on a scale of 0 to 10, where 0 is "does not interfere" and 10 is "completely interferes" within the last week. The mean of these seven scores was calculated to obtain the pain interference score. The score at End of Treatment (EOT) was compared to the baseline score to determine the percentage of subjects who had a clinically significant (30% or greater) reduction in pain interference.

Per protocol set (Subjects in the full analysis set who also were implanted with a Smartpatch Lead, had an adequate number of worst pain intensity (BPI3) scores in the End of Treatment subject diary period, and continued to meet all eligibility criteria throughout treatment)