Rigid intrasegmental fixation for repair of a pars defect in a young athlete: case report and description of technique.

Stabilization for the treatment of a pars defect frequently involves fusion with sacrifice of a motion segment. Intrasegmental stabilization has been described, however, with preservation of the motion segment by using various constructs. We describe a method of obtaining rigid fixation across a pars defect without sacrificing a motion segment.

Longitudinal deficiency of the fibula. Operative treatment.

We reviewed the results of early amputation and prosthetic fitting in twenty-five children (thirty-one extremities) who had longitudinal deficiency of the fibula and were managed between 1977 and 1992. The median age at the time of the initial operation was thirteen months (range, eight months to nine years and eight months). The median duration of follow-up was eight years and ten months (range, two years and six months to sixteen years and eleven months).

A 13-month-old boy with progressive genu valgum.

The following case illustrates the roentgenographic and clinical findings of a condition of interest to the orthopedic surgeon. Initial history, physical findings, and roentgenographic examinations are indicated below. The final clinical and differential diagnoses are presented on the following pages.

Influence of some physical factors on survival of Marek's disease vaccine virus.

Cell-associated Marek's disease (MD) vaccine was suspended at dilutions normally used for vaccination in seven commercially available diluents and in tryptose phosphate broth. The stability of diluted vaccines was determined by assay in cell cultures subjected to 0 to 37 C for 0 to 90 minutes. Optimum holding temperatures for MD vaccine virus survival varied with the specific diluents employed.