Mallard landing behavior on water follows a -constant braking strategy.

Many flying animals use optic flow to control their flight. During landing maneuvers, pigeons, hummingbirds, bats, Draco lizards and bees use the -constant braking strategy. This strategy regulates the approach by keeping the ratio of distance to an object and the rate of change of that distance constant.

High prevalence of contralateral ankle abnormalities in association with knee osteoarthritis and malalignment.

Objective: To evaluate ankle joint abnormalities in a knee osteoarthritis (OA) cohort.

Methods: Participants (n = 159) with symptomatic and radiographic OA in at least one knee underwent technetium-99m methylene diphosphonate bone scan (scored 0-3) of the ankles and forefeet. Knee radiographs were graded for OA features of joint space narrowing (JSN) and osteophyte (OST).

Early life stress triggers sustained changes in histone deacetylase expression and histone H4 modifications that alter responsiveness to adolescent antidepressant treatment.

Early life stress can elicit long-lasting changes in gene expression and behavior. Recent studies on rodents suggest that these lasting effects depend on the genetic background. Whether epigenetic factors also play a role remains to be investigated.

A comparison of perioperative outcomes in patients with and without rheumatoid arthritis after receiving a total shoulder replacement arthroplasty.

Hypothesis: The long-term survival rate of total shoulder arthroplasty (TSA) is comparable to hip and knee arthroplasty. Although TSA is considered a safe and effective procedure with low complications in patients with osteoarthritis and rheumatoid arthritis (RA), data are lacking on perioperative complications. Complication rates and hospital disposition differences between patients with and without RA who underwent TSA were investigated.