The AOjASIF* dynamic hip screw (DRS) has been designed primarily to
stabilize trochanteric fractures of the hip. Selected fractures of the
femoral neck and some subtrochanteric fractures are further indications
for the DRS [40, 46]. The dynam- ic condylar screw (DCS) has been
developed for fractures of the distal femur and is now being tested
clinically. The DRS and DCS are carefully coordinated with the
preexisting ASIF standard sets of equipment for internal fixation of
fractures. The concept of a sliding screw for trochanteric fractures is
not new. The first author describing such an implant was Schumpelick
[44]; he gives credit to Pohl [22], who was primarily a manufacturer
working for Gerhardt Kiinscher. Re described the possibility of
impaction at the fracture site with a sliding device. In the United
States Clawson [7, 8] introduced the hip screw and found it to be
extremely beneficial in trochanteric fractures. At approximately the
same time, Massie [31, 32] and Pugh [39] designed the sliding-type
flange nails, which offer similar intramedullary splinting with the
possibility of fracture impaction. The following chapters describe the
concept and design features of the DRS, as well as the details of the
surgical technique. The application of the DRS for different types of
fractures is illustrated with clinical examples. The results of 268
cases of trochanteric fractures treated with the DRS are presented and
compared with results using the angled blade plate and Ender's nails.
Finally, some laboratory tests are described.
