Background Anserine syndrome (AS) includes two pathological presentarions: The anserine bursitis and the anserine enthensytis. Most diagnostics of anserine syndrome are made considering topographic semiotics. It is logical to assume that treatment of different physiopathological features are associated with different clinical history but not necessary with differences in the clinical exam.
Objectives To find relationships between ultrasonographic (US) findings and epidemiological data in patients with anserine syndrome
Methods All the images of ultrasonographic studies of patients from 2013 to 2014 who were clinically assessed due to AS were reviewed. For that purpose we use the electronic database of the A&E department. Gender, age, and time from onset of symptoms were used to find correlation with US findings. US assessments were performed by two trained rheumatologist using standard Eular definitions as part of common clinical practice during the period selected. Findings considered positive were: bursitis and enthesitis.
Results 113 registries which fulfilled the clinical diagnostic criteria were analyzed with their corresponding ultrasonographic images. 38 cases were unrelated to any particular ultrasonogrpahic finding, 20 were compatible with bursitis and 56 with enthesitis. Average age in the three groups were 69 SD 8, 46 SD 7 and 55 SD 9 years old (P<0.0001). Patients with bursitis where significantly younger than patients with enthesitis (P=0.0001). Also, patients without findings were significantly older than both other groups (P<0.0001 for both comparisons). Proportion of female gender was 58.9%, 65,0% and 53.6%, in enthesitis, bursitis and no-findings group, respectively (P=0.647). According to time since onset of symptoms, patients with less than a week presented bursitis and enthesitis in 55.17% and 34.48%, respectively. Patients with symptoms within 7 to 14 days presented bursitis and enthesitis in a proportion of 6.67% and 46.67%, respectively. Finally patients with symptoms within 15 days and less than a month presented bursitis in 2.56% and enthesitis in 64.10%. Bursitis was significantly higher in patients with acute symptomps compared to the other two groups (P<0.001). In the other hand, most patients with enthesitis were classified into the groups with a longer time since onset of symptoms (P<0.05)
Conclusions Our results point as Follows: (1) The probability of identify no US findings is higher in older patients than younger. It is possible that mechanical issues related with the collateral ligament could cause a pain that suggest an anserine syndrome. (2) As earlier the symptoms are, is more factible the finding of bursitis. It could suggest that bursitis is a sign of acuteness. This finding could have relevance in terms of infiltration indication.
Disclosure of Interest None declared