Improving greater trochanteric reattachment with a novel cable plate system

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Implant design

Background:

• Cable-grip systems are standard for greater trochanteric reattachment.
• Existing systems have a high complication rate.
• Improved fixation stability is needed to reduce complications.

Purpose of the Study:

• To introduce and evaluate a novel Y-shaped plate and superelastic cable fixation system.
• To compare the novel system against a commercial system for greater trochanter reattachment.
• To assess the impact on fragment movement and cable tension.

Main Methods:

• A factorial design of experiments compared a novel system (Y-plate, locking screws, superelastic cables) with a commercial system.
• Testing involved 50 cycles of abductor and hip forces on femur models.
• Independent variables included plate system, cable type, abductor angle, and femur model.

Main Results:

• The novel plate reduced greater trochanter fragment movement by up to 26% per cycle and 46% in permanent degradation.
• Superelastic cables reduced cable tension loosening by up to 24%.
• The reduction in cable loosening did not significantly decrease overall greater trochanter movement.

Conclusions:

• The novel Y-shaped plate and superelastic cable system offers advantages over current commercial systems.
• The plate effectively reduces hip abductor-generated movements.
• Superelastic cables minimize cable loosening, potentially decreasing risks of greater trochanter non-union.