Related Experiment Video
Updated: Jul 4, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
Published on: September 7, 2022
Error in acetabular socket alignment due to the thick anterior pelvic soft tissues
1Department of Information and Mechatronics Engineering, GwangJu Institute of Science and Technology, Oryong-dong 1, Buk-gu, GwangJu, Rep Korea.
Digitizing errors from thick pelvic soft tissues significantly impact acetabular socket alignment during hip replacement surgery. Navigation systems may yield inaccurate anteversion guidance for these patients.
Area of Science:
- Orthopedic surgery
- Medical imaging technology
Background:
- Accurate acetabular socket placement is crucial for total hip arthroplasty (THA) success.
- Thick soft tissues in the anterior pelvic region can introduce digitizing errors during navigation-assisted THA.
Purpose of the Study:
- To quantify the impact of digitizing errors in the anterior pelvic area on acetabular socket alignment.
- To evaluate the reliability of current navigation systems in patients with substantial anterior pelvic soft tissues.
Main Methods:
- Utilized a synthetic pelvic model and an OrthoPilot navigation system for measurements.
- Defined the anterior pelvic plane using anterior superior iliac spines (ASIS) and pubic tubercles.
- Simulated 1 cm digitization errors at key landmarks to assess effects on anteversion and abduction.
Main Results:
- A 1 cm error at the contralateral ASIS caused a 4.4-degree error in anteversion.
- Errors at the pubic tubercles significantly affected anteversion (-6.8 degrees) and abduction (-0.2 degrees).
- Digitization errors demonstrated a notable impact on acetabular anteversion and abduction angles.
Conclusions:
- The anterior pelvic plane definition in navigation systems can lead to significant acetabular anteversion errors in patients with thick anterior pelvic soft tissues.
- Current navigation systems may require adjustments or alternative methods for accurate acetabular guidance in specific patient populations.
- Further research is needed to refine navigation techniques for improved accuracy in THA.
Related Concept Videos
Bones of the Lower Limb: Femur and Patella
Muscles of the Pelvic Floor and Perineum
Perineal Layer
The perineum is a diamond-shaped area below the pelvic diaphragm, divided into an anterior urogenital triangle that contains the external genitals and a posterior anal triangle housing the anus. The urogenital...
Muscles that Move the Thigh
Three other significant muscles are the gluteus maximus, gluteus medius, and gluteus minimus. The gluteus maximus originates from the posterior surface of the ilium, sacrum, and coccyx, and the thoracolumbar fascia...
Ultrasonography
During an ultrasonography procedure, a handheld device called a...