Staged surgical management of the sequelae of neonatal septic hip arthritis: a case report and review of the literature.

Total necrosis of the femoral head is a common sequelae after septic hip arthritis in infancy. Septic hip dislocation may develop, with severe functional consequences on the growing child: limping and limb length discrepancy. We present our staged surgical treatment of Choi's type IV A sequelae of septic hip arthritis in a 2-year old boy. Open reduction, followed by various reconstructive procedures, were performed. After 8 years of follow-up, the child has a stable, mobile hip, with good functional outcomes. Close follow-up is mandatory to ensure a good long-term outcome. Our technique proved to be successful in the achievement of a functional hip by maintaining the remnants of the femoral head and creating the conditions to remodel them quasi-normal.

Rapid determination of Faraday rotation in optical glasses by means of secondary Faraday modulator.

A rapid high sensitive method for determining the Faraday rotation of optical glasses is proposed. Starting from an experimental setup based on a Faraday rod coupled to a lock-in amplifier in the detection chain, two methodologies were developed for providing reliable results on samples presenting low and large Faraday rotations. The proposed methodologies were critically discussed and compared, via results obtained in transmission geometry, on a new series of aluminophosphate glasses with or without rare-earth doping ions. An example on how the method can be used for a rapid examination of the optical homogeneity of the sample with respect to magneto-optical effects is also provided.