[Experimental evaluation of a newly developed 90 degree angle plate (MC angle plate) for intertrochanteric derotation...

A newly developed 90 degrees angled blade plate that permits high interfragmentary compression with a potential sliding way of 9 mm, is described. In the majority of intertrochanteric osteotomies, and especially when applying "functional pre-bending", the use of an external compression device is not necessary with this plate. The plate consists of 2 modules which permit a temporary thickening of the plate up to 10 mm, and the principle of dynamic compression can be performed with a 45 degree screw hole for the sliding way of 9 mm. The results of testing showed that a compression force of up to 1200 N was possible. The resulting interfragmentary compression could not be increased even with the aid of an external compression device or by idealized experimental conditions. Whenever dynamic compression is necessary for fixation, the modular compression principle described here can be used with any other plate system.