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Computed Tomography

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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Related Experiment Video

Updated: Jul 17, 2026

Cone Beam Intraoperative Computed Tomography-based Image Guidance for Minimally Invasive Transforaminal Interbody Fusion

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Published on: August 6, 2019

Conventional versus computer-tomography based navigation assisted eccentric rotational acetabular osteotomy in less

Yusuke Osawa¹, Yasuhiko Takegami², Hiroto Funahashi²

¹Department of Orthopaedic Surgery, Nagoya University, Nagoya, Japan. ysk0568@yahoo.co.jp.

Archives of Orthopaedic and Trauma Surgery

|July 21, 2025

Summary

Navigation systems help less-experienced surgeons improve outcomes for eccentric rotational acetabular osteotomy (ERAO). Navigation-guided ERAO reduces complications and improves acetabular coverage compared to conventional methods.

Keywords:

Eccentric rotational acetabular osteotomy Hip joint Periacetabular osteotomy Surgical navigation systems

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Last Updated: Jul 17, 2026

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Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

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Published on: February 17, 2023

Area of Science:

Orthopedic surgery
Surgical navigation technology

Background:

Periacetabular osteotomies are complex procedures.
Navigation systems may enhance surgical planning and outcomes, particularly for less experienced surgeons.

Purpose of the Study:

To evaluate and compare the clinical outcomes of conventional eccentric rotational acetabular osteotomy (ERAO) versus navigation-guided ERAO.

Main Methods:

Retrospective study of 70 patients with hip dysplasia undergoing ERAO by less experienced surgeons.
Patients were divided into conventional (38) and navigation (32) groups.
Outcomes assessed: operative time, blood loss, Harris Hip Scores (HHS), complications, and acetabular imaging.

Main Results:

No significant differences in operative time, blood loss, or HHS between groups.
Fewer complications in the navigation group (9%) vs. conventional (24%).
Improved postoperative acetabular coverage (lateral center edge angle, acetabular head index) in the navigation group.

Conclusions:

Navigation systems enable less experienced surgeons to achieve favorable acetabular coverage and reduce complications with ERAO.
Navigation-guided ERAO is a viable option for improving outcomes in hip dysplasia surgery.