LCP DHS with Collar

The LCP DHS with collar is used to treat femoral neck, inter- and pertrochanteric fractures. The LCP DHS with collar is a modification of the existing DHS. The collar allows for a moderate lateral buttress and accommodates the head of the antirotational screw. Additional features are the LCP holes and a bullet nose at the distal end. The angle of the collar is 15 and has been specifically designed to match the Asian anatomy. The LCP DHS with collar is compatible with the trochanter stabilization plate and the locking trochanter stabilization plate.

The surgical technique of the LCP DHS with collar is the same as that of the DHS. The only difference is that the antirotational screw must be inserted through the collar. However, the changes in geometry of the LCP DHS with collar (collar, LCP hole, undercuts, bullet nose at the distal end of the plate) offer the surgeon the possibility to achieve angular stability of the fixation and to choose a less invasive approach. Undercuts help to improve the periosteal blood supply.

The clinically well established geometry of the barrel (sliding mechanism) has not been changed.

The static test reveals a slightly higher stiffness for the new LCP DHS with collar plate/screws system compared to the standard DHS plate/screw system. With all performed dynamic tests the plate is the critical component of the DHS system and ist the first to fail.

The LCP DHS with collar is currently available in titanium aluminium niobium (TAN) only. The system will start with sizes 135 (35 holes) and 140 (35 holes). Additional sizes will be added later.

80-year-old female.

Case provided by Takefumi Kuroki, Fukuoka, JP

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