Degenerative rotator cuff tears are associated with a low Omega-3 Index.

BACKGROUND: The etiology of degenerative rotator cuff tears is multifactorial but chronic inflammation plays an important role in the pathogenesis. Some polyunsaturated fatty acids (PUFA) can modulate inflammation and marine n-3 (Omega-3) PUFA have anti-inflammatory effects. We hypothesized that the Omega-3 Index is lower in patients with degenerative rotator cuff tears when compared to controls without rotator cuff tendinopathy. METHODS: From 684 consecutive patients with full thickness rotator cuff tears 655 were excluded because of possible bias. In the remaining 29 patients (22 m, 7 f; 53,9 y) with degenerative full thickness rotator-cuff tears, erythrocyte fatty acids were analyzed using the HS-Omega-3 Index® methodology. 15 healthy volunteers (10 m, 5 f; 52.5y) served as a control. RESULTS: The Omega-3 Index (% EPA + DHA) was 5.01% (95% CI: 3.81-4.66) in patients and 6.01% (95% CI: 4.48-5.72) in controls (p = 0.028) CONCLUSIONS: Patients with full thickness degenerative rotator cuff tears had a significantly lower Omega-3 Index than controls without rotator cuff tendinopathy. Whether a lower Omega-3 Index represents an independent risk factor for degenerative rotator cuff tears should be further investigated, e.g. in a longitudinal study.

Trans-fatty acid levels in erythrocytes in Europe.

PURPOSE: High, but not low levels of trans-fatty acids (TFA) in erythrocytes are associated with increased mortality. Current erythrocyte TFA levels in Europe are not known. METHODS: TFA levels in samples submitted by physicians for erythrocyte omega-3 fatty acid analyses are reported, as analysed with a method (HS-Omega-3 Index®) previously used in pertinent prospective epidemiologic studies. From Germany, 6754 samples were included from 2008 through 2015, and 496 samples from 10 other European countries. RESULTS: In Germany, mean levels of C16:1n-7t, a marker for dairy and meat intake, decreased, as did mean levels of industrially produced (IP)-TFA, as did the percentage of individuals with IP-TFA > 1.04 %. Mean levels of IP-TFA in Austria and Switzerland were low before and after measures were taken to reduce them. Average levels of C16:1n-7t were low, and at levels associated with increased risk of death in previous studies. A limitation of our study is that samples were not obtained in a specific or representative manner. CONCLUSIONS: Levels of IP-TFA appear to be decreasing, as are those of ruminant-derived C16:1n-7t, a marker for dairy and meat intake. Few individuals had high levels of IP-TFA above a safe range, while many had low levels of C16:1n-7t. Our data argue against further action against TFA in the countries studied. More systematic biomarker-based studies are needed.