الفهرس 
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Abstract
Ultrasound and electrophysiological studies were conducted on these patients to determine the etiology of the pain, resulting in three distinct groups:
• Patients with isolated nerve pathology (31 patients, 31.3%),
• Patients with isolated joint pathology (35 patients, 35.4%), and
• Patients with combined pathology (33 patients, 33.3%).
In this study the mean age of the participants was 45.36 ± 11.54 years, with mean disease duration of 11± 7.7, with female to male ratio of 7.2:1.
According to the pain-DETECT score, the participants were classified into three groups: nerve pathology, joint pathology and combined pathology group.
Patients with joint pathology had a higher prevalence of deformities, and ankle deformity was the most common one in the three groups.
Patients with joint pathology had a higher percentage of steroid use while those with nerve pathology had a higher percentage of hydroxychloroquine use.
Patients with joint pathology had a higher DAS-28 ESR score compared to patients with nerve pathology or combined pathology, while patients with nerve pathology had a higher pain-DETECT score compared to patients with joint pathology or combined pathology.
Regarding the MSUS in this study, the patients with joint pathology had a significantly higher synovial proliferation score, tenosynovitis gray scale score, bone erosions and cartilage damage scores compared to nerve pathology and combined pathology. On the other hand, patients with nerve pathology had a significantly lower scores in all parameters.
The mean CSA values for the studied nerves was statistically significant in peroneal and sural nerves in patients with nerve pathology compared to those with joint pathology.
Regarding the tibial nerve motor studies in the examined feet, the mean of latency and F wave latency were the only data that are significantly higher in patients with nerve pathology compared to those with joint pathology or combined pathology.
Regarding the peroneal nerve motor studies in the examined feet, the mean values for NCV and percentage of decreased amplitude were significantly higher in patients with joint pathology compared to those with nerve pathology or combined pathology.
CSA of the three studied nerves had a significant positive correlation with the pain-DETECT score.
In our study the performance of the pain-DETECT for predicting isolated nerve pathology, with a cut-off point of >21 having an AUC of 0.732, sensitivity of 54.84%, and specificity of 83.08%, with a diagnostic accuracy of 74.0%.