Iliopsoas Impingement After Direct Anterior Approach Total Hip Arthroplasty: Epidemiology, Risk Factors, and Treatment Options.

Background: The objective of this study is to evaluate the incidence, natural history, response to treatment, and risk factors for anterior iliopsoas impingement (AIPI) after direct anterior approach (DAA) total hip arthroplasty (THA).

Methods: Between January 1, 2009 and January 4, 2014, 600 patients (655 hips) who underwent primary DAA THA were retrospectively reviewed. AIPI incidence was calculated.

Optimum anatomic socket position and sizing for the direct anterior approach: impingement and instability.

A comprehensive strategy is important for ensuring reproducible and safe acetabular component sizing and positioning. Presented here is our approach for anatomic acetabular component positioning in direct anterior total hip arthroplasty. This strategy has evolved with our understanding of the ramifications of socket sizing and positioning on instability and impingement.

Postoperative changes in the tensor fascia lata muscle after using the modified anterolateral approach for total hip arthroplasty.

The modified Watson-Jones approach to the hip has been described as a minimally invasive approach with the potential for fewer postoperative complications than the traditional approach. Because the approach relies on an intermuscular rather than an internervous plane, there is potential for injury to the superior gluteal nerve. The aim of this study was to evaluate incidence of tensor fascia lata (TFL) denervation in patients undergoing this approach.

Insulin secretion is increased in pancreatic islets of neuropeptide Y-deficient mice.

Neuropeptide Y (NPY), whose role in appetite regulation is well known, is also expressed in pancreatic islets. Although previous studies indicated that application of NPY to pancreatic islets inhibits insulin secretion, its physiological role in the regulation of insulin secretion is not fully understood. We hypothesized that NPY in islets tonically suppresses insulin secretion and the reduction of islet NPY increases insulin secretion.

Neuropeptide Y deficiency attenuates responses to fasting and high-fat diet in obesity-prone mice.

Neuropeptide Y (NPY) stimulates feeding and weight gain, but deletion of the NPY gene does not affect food intake and body weight in mice bred on a mixed genetic background. We reasoned that the orexigenic action of NPY would be evident in C57Bl/6J mice susceptible to obesity. NPY deficiency has no significant effect in mice fed a normal rodent diet.