Osteotomy Guiding Device
The success of lower-limb osteotomies depends on accurate correction of the mechanical axis and stable fixation during consolidation. Exact realignment of the leg requires precise resection of a bone wedge. The high precision reduces the risk of under- or overcorrection which is what improves the quality of an osteotomy and their durability (knee arthroplasty can be delayed or avoided completely).
The osteotomy guiding device (OGD) is applicable for every closedwedge osteotomy on long bones in lower limbs that require removal of a bone wedge with correction angles from 4 to 20. It is made up of a frame with a fixed positioning arm and a calibrated handle. The pivoting angular arm can be adjusted on the handle at a selected angle or measured with a caliper (millimeter). K-wires, which are inserted into drill sleeves located in the positioning arm and in the pivoting arm, define the bone wedge. The preoperative determined correction angle alpha is adjusted on the handle with respect to the osteoteomy depth. The depth gauge is specifically designed for use with the OGD as use of a standard screw measuring device would result in false measurements.
Pictures provided by Philipp Lobenhoffer, Hannover, Germany
Fig 1ac Use of the OGD. 
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