A mapping is obtained relating radial screened Coulomb systems with low screening parameters to radial anharmonic oscillators in N-dimensional space. Using the formalism of supersymmetric quantum mechanics, it is shown that exact solutions of these potentials exist when the parameters satisfy certain constraints.
The aim of this study was to evaluate a new technique for insertion of pedicle screws. The position of the screws was assessed on postoperative plain radiographs and computed tomography (CT) scans, and the interobserver reliability in evaluation of the pedicle screw positions was studied. The technique was applied to insert 201 pedicle screws in 27 patients… (More)