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Updated: Feb 25, 2026

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Published on: October 20, 2021

Type II sciatic nerve variant: an unexpected interventional hazard.

Graeme Thompson¹, Ruan Visagie²

¹Morton and Partners Radiologists, Cape Town, South Africa. graeme.thompson@morton.co.za.

Skeletal Radiology

|July 28, 2017

Summary

A pediatric osteoid osteoma removal led to unexpected sciatic nerve injury due to an anatomical variant. Pre-procedural imaging is crucial for identifying such variations to prevent complications during pelvic interventions.

Keywords:

Acetabulum Iatrogenic Injury Osteoid osteoma Piriformis Sciatic nerve Type II variant

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Area of Science:

Orthopedic Surgery
Radiology
Neuroanatomy

Background:

Osteoid osteomas are benign bone tumors often requiring surgical intervention.
Pelvic interventions carry risks due to proximity to neurovascular structures.
Anatomical variations can complicate surgical planning and execution.

Observation:

A 12-year-old girl with hip pain was diagnosed with an acetabular osteoid osteoma.
Percutaneous CT-guided drilling was performed for lesion removal.
Post-operatively, MRI revealed common peroneal nerve injury with muscle denervation.

Findings:

The injury was attributed to an unusual sciatic nerve variant with the common peroneal nerve exiting superolaterally.
This variant positioned the nerve adjacent to the planned guidewire trajectory.
Histology confirmed the osteoid osteoma, but the nerve injury was a procedural complication.

Implications:

Highlights the critical need for pre-procedural identification of sciatic nerve variants in pelvic interventions.
Emphasizes the importance of detailed anatomical review to mitigate risks of iatrogenic nerve injury.
Suggests enhanced imaging protocols may be beneficial for complex pelvic procedures in pediatric patients.