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Structures at risk from medially placed acetabular screws.

E M Keating1, M A Ritter, P M Faris

  • 1Center for Hip and Knee Surgery, Mooresville, Indiana 46158.

The Journal of Bone and Joint Surgery. American Volume
|April 1, 1990
PubMed
Summary
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Acetabular screw placement risks injury to nearby blood vessels and nerves. Avoid the anterosuperior quadrant to prevent damage to medial vascular structures.

Area of Science:

  • Anatomy
  • Orthopedic Surgery
  • Surgical Safety

Background:

  • Acetabular fractures require surgical fixation with screws.
  • Understanding the proximity of critical structures to screw placement is vital for patient safety.

Purpose of the Study:

  • To identify anatomical structures at risk from acetabular screw penetration.
  • To provide guidance on safe screw placement in the acetabulum.

Main Methods:

  • Anatomical study of fourteen acetabula (embalmed, fresh autopsy, and intraoperative specimens).
  • Construction of models to visualize potential screw trajectories and penetrations.
  • Detailed examination of structures adjacent to the acetabulum.

Main Results:

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  • Medially placed screws posed a significant risk to the external iliac vein, obturator neurovascular bundle, and internal iliac vein tributaries.
  • Potential for screw penetration into vital medial structures was demonstrated.
  • The anterosuperior quadrant was identified as a critical area for screw placement.

Conclusions:

  • Screws placed medially in the acetabulum can endanger major vascular and neural structures.
  • To mitigate risks, acetabular screw placement should avoid the anterosuperior quadrant.
  • This finding is crucial for preventing intraoperative complications during acetabular fracture repair.