Three-dimensional evaluation of the cyclic loading behavior of different rotator cuff reconstructions.

Purpose: To perform a biomechanical comparison of single-row rotator cuff repairs with modified suture configurations versus double-row repairs using radiostereometric analysis (RSA).

Methods: The infraspinatus tendon and the humerus of 40 porcine cadaveric shoulders were marked with tantalum beads and placed in an RSA calibration cage that allows for calculation of 3-dimensional positions of the tantalum markers. The intact tendon was cyclically loaded (50 cycles/20 N).

Cyclic loading of rotator cuff reconstructions: single-row repair with modified suture configurations versus double-row repair.

Background: Double-row repair is suggested to have superior biomechanical properties in rotator cuff reconstruction compared with single-row repair. However, double-row rotator cuff repair is frequently compared with simple suture repair and not with modified suture configurations.

Hypothesis: Single-row rotator cuff repairs with modified suture configurations have similar failure loads and gap formations as double-row reconstructions.

Rapid modulation of L-type calcium current by acutely applied oestrogens in isolated cardiac myocytes from human, guinea-pig and rat.

Gender-based differences in cardiovascular mortality may be due to a cardio-protective effect of oestrogens on the myocardium. However, mRNA expression of oestrogen receptors in myocardial tissue of the adult heart has yet to be demonstrated. Furthermore, a calcium antagonistic action of 17beta-oestradiol on myocardial tissue has been discussed.