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Difference in trochanteric thickness between well-aligned and malaligned polished collarless stem.

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Greater trochanter thickness differs significantly between correctly and incorrectly placed femoral stems. A remnant thickness of 12.5 mm may indicate ideal neutral stem positioning in hip replacements.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Radiology

Background:

  • Continuous evolution of surgical techniques and instruments aims to optimize component placement in hip replacements.
  • Investigating greater trochanter thickness differences between correctly and malpositioned femoral stems is crucial for improving surgical outcomes.
  • Under-reaming of the trochanter can lead to femoral stem malposition, highlighting the need for precise measurement.

Purpose of the Study:

  • To determine if there is a significant difference in greater trochanter thickness between neutrally positioned and malpositioned femoral stems.
  • To identify the ideal greater trochanter thickness for achieving neutral femoral stem placement.
  • To assess the potential of trochanteric thickness as a surgical aid for intraoperative component positioning.

Main Methods:

  • Measurement of greater trochanteric thickness in 95 hip replacements using trauma CAD/PACS software.
  • Classification of stem position as neutral (central axis alignment) or varus (lateral deviation).
  • Intra-observer and inter-observer reliability assessment of measurements.

Main Results:

  • A statistically significant difference in mean trochanteric thickness was observed between neutral (12.6 mm) and varus (18.4 mm) stem positions (p < 0.0001).
  • The median trochanteric thickness for neutral stems was 12.5 mm.
  • High intra-observer correlation (99%) among senior personnel and good correlation (80%) between senior and junior staff were noted.

Conclusions:

  • Greater trochanteric thickness is a significant indicator differentiating well-aligned from malaligned femoral components.
  • A remnant trochanteric thickness of approximately 12.5 mm may serve as a valuable intraoperative guide for achieving neutral stem alignment.
  • Development of a surgical instrument for intraoperative trochanter thickness measurement could aid surgeons, particularly junior ones, in optimizing component placement.