A bone plate is provided with a keyhole shaped aperture having a first wide portion leading into a second narrow portion by way of a discontinuous narrowing. The method comprises the step of administering to the subject an effective amount of a compound represented by Formula :The values of the variables in Formula are described herein. Struvite purity was strongly dependent on the pH and the electric current density. The gasket inner seal and circuit board are intermediately located between the cover and the base.