Radiographic results of callus distraction aided by pulsed low-intensity ultrasound.

Objectives: To determine whether pulsed low-intensity ultrasound (frequency of 1.5 megahertz, pulsed by one kilohertz, signal burst width of 200 microseconds, intensity of thirty milliwatts per square centimeter, and daily treatment time of twenty minutes per day) stimulates regenerate maturation after callus distraction.

Design: Prospective, controlled animal trial.

Effects of high-frequency, low-magnitude mechanical stimulus on bone healing.

Recent studies have shown osteogenic effects of high-frequency mechanical stimuli. The purpose of this study was whether externally applied, high-frequency, low-magnitude interfragmentary movements affect the process of bone healing. In 12 sheep, a transverse osteotomy with a 3 mm gap was created in the right metatarsus and externally stabilized by a rigid circular fixator.

Endothelial cell population changes of human cornea during life.

A photo slit lamp was used to obtain color, specular reflex, high magnification photographs of the corneal endothelium of subjects ranging in age from 3 to 88 years. Multiple areas of the cornea were examined to determine the endothelial cell population. No appreciable difference in cell density was found between the right and left eyes of the subjects nor between male and female subjects of similar age.