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Computerised Tomographic Analysis of Differences in Scaphoid Trabecular Density in the Intact Bone.

Liliane A Freundt1, Ingmar W F Legerstee1,2, Oscar Y Shen1

  • 1Hand and Arm Center, Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, MA, USA.

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Summary

Optimal screw placement for scaphoid fractures involves targeting areas of highest bone density. This study found the proximal pole is densest, suggesting specific entry points for antegrade and retrograde screw fixation to improve healing.

Keywords:
Hounsfield units (HU)Percutaneous screw fixationScaphoid densityScaphoid fractureSurgical planning

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Area of Science:

  • Orthopedic surgery
  • Bone biomechanics
  • Radiology

Background:

  • Percutaneous screw fixation is a standard treatment for nondisplaced or scaphoid waist fractures.
  • Screw positioning in regions of high trabecular bone density enhances fracture stability and promotes bone healing.
  • Understanding scaphoid bone density variations is crucial for optimizing screw placement techniques.

Purpose of the Study:

  • To compare the bone density across six distinct segments of the intact scaphoid bone.
  • To identify optimal anatomical locations for screw insertion to maximize fracture healing.
  • To guide surgical approaches for percutaneous screw placement in scaphoid fractures.

Main Methods:

  • Utilized the 3D Quantitative Imaging (3DQI) Platform to analyze 214 intact scaphoid bone scans.
  • Divided the scaphoid into proximal, middle, and distal regions, with further segmentation into radial and ulnar aspects.
  • Measured bone density in Hounsfield units (HU) and statistically compared segment densities using a mixed-effects model.

Main Results:

  • The proximal pole exhibited the highest bone density (proximal radial: 551 ± 115 HU; proximal ulnar: 546 ± 116 HU).
  • Bone density decreased progressively from the proximal to the middle and distal poles.
  • Proximal scaphoid segments were significantly denser than middle and distal segments.

Conclusions:

  • For retrograde screw placement, initiating from a more ulnar aspect of the distal pole maximizes engagement with dense trabecular bone.
  • The proximal pole offers uniform density, allowing screw placement flexibility based on the fracture plane for antegrade fixation.
  • Prioritizing the ulnar segment of the distal pole, when feasible, is recommended for enhanced stability in scaphoid fracture treatment.