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Pelvic osteotomies: anatomic pitfalls at the ischium. A cadaver study
M de Kleuver1, M A Kooijman, J M Kauer
1Department of Orthopaedic Surgery, St. Maartenskliniek, Nijmegen, The Netherlands.
Archives of Orthopaedic and Trauma Surgery
|August 26, 1998
Summary
Pelvic osteotomies for acetabular dysplasia carry anatomical risks. A posterior approach transverse ischial osteotomy below the sacrospinous ligament offers the safest surgical option, minimizing neurovascular damage.
Area of Science:
- Orthopedic Surgery
- Anatomy
- Surgical Safety
Background:
- Acetabular dysplasia often requires pelvic osteotomies for correction.
- Ischial osteotomies are a component of certain pelvic osteotomies.
- Understanding anatomical hazards is crucial for surgical safety.
Purpose of the Study:
- To assess the anatomical risks associated with three distinct ischial osteotomy techniques.
- To identify the safest approach for ischial osteotomy in the context of pelvic osteotomies for acetabular dysplasia.
Main Methods:
- A triple osteotomy procedure was performed on 8 fresh cadaver pelvises.
- Anatomical relationships and potential neurovascular structure proximity were evaluated for each osteotomy type.
Main Results:
- An oblique posterior osteotomy above the sacrospinous ligament necessitates mobilization of neurovascular structures.
- A transverse posterior osteotomy below the sacrospinous ligament provides a safer zone between the pudendal and sciatic nerves.
- An anterior transverse osteotomy, through a modified Smith-Peterson approach, risks damage to non-visualized medial, lateral, and distal neurovascular structures.
Conclusions:
- The transverse posterior ischial osteotomy below the sacrospinous ligament is the safest technique among those evaluated.
- Surgeons must be aware of the specific anatomical risks associated with each ischial osteotomy approach to prevent iatrogenic injury.