Walter E. Strippgen

A modular spinal rod linkage system to provide rotational stability

The effect of cross linkage on the In vitro stability of paired Harrington distraction rods was studied in an unstable fracture model using calf spine segments. Cross linkage used in conjunction with sublaminar wires significantly improved torsional stability, improved lateral bending stability, and had no adverse affect on stability for axial, forward flexion, or extension loading compared to rods alone, rods with bridges, and wired rods.

Anthropometric studies of the human sacrum relating to dorsal transsacral implant designs.

The sacrum offers several possibilities for fixation that, when combined, appear to provide a secure foundation for a dorsally-placed, transsacrally-fixed implant. The dorsal sacral landmarks, particularly the first and second dorsal foramina, are readily identifiable and relate in a consistent manner both qualitatively and quantitatively to the major mass of sacral bone, which is located ventrally to the vital structures of the sacrum. The authors have utilized these findings in the design of a new implant for direct sacral fixation.