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Related Concept Videos

Anatomical Positions01:11

Anatomical Positions

In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...
Abdominal Regions and Quadrants01:19

Abdominal Regions and Quadrants

To promote clear communication, for instance, about the location of a patient's abdominal pain or a suspicious mass, anatomists and clinicians typically use imaginary lines to categorize the abdominopelvic cavity into either four quadrants or nine regions to identify organs in the cavity.
The simpler quadrants approach, which is more commonly used in medicine, subdivides the cavity with one horizontal and one vertical line that intersects at the patient's umbilicus (navel). The four quadrants...

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Related Experiment Video

Updated: Jun 19, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

Acetabular orientation with different pelvic registration landmarks.

William M Mihalko1, Sergej Kammerzell, Khaled J Saleh

  • 1Campbell Clinic Orthopaedics, InMotion Orthopaedic Research Laboratory, University of Tennessee, Memphis, Tennessee 38017, USA.

Orthopedics
|October 20, 2009
PubMed
Summary
This summary is machine-generated.

The posterior interspinal line, using posterosuperior iliac spines (PSIS), is more accurate for pelvic plane determination in the lateral position than acetabular rim or transverse acetabular ligament (TAL) landmarks.

Related Experiment Videos

Last Updated: Jun 19, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

Area of Science:

  • Orthopedic surgery
  • Anatomical landmark identification
  • Surgical navigation

Background:

  • Accurate pelvic plane identification is crucial for orthopedic procedures.
  • Traditional methods may lack precision in specific patient positions.
  • Alternative landmarks require validation for reliability.

Purpose of the Study:

  • To evaluate the accuracy of various pelvic landmarks in the lateral position.
  • To compare landmark accuracy against the established pelvic plane.
  • To determine the most reliable landmark for surgical navigation.

Main Methods:

  • Utilized five whole-body cadavers for anatomical analysis.
  • Employed the OrthoPilot navigation system for landmark registration.
  • Registered pelvic plane in supine and lateral positions, including PSIS, ASIS, acetabular rim, and TAL.

Main Results:

  • The posterior interspinal line (PSIS) showed minimal inclination difference (1.8° ± 1.7°) compared to the pelvic plane.
  • Acetabular rim and TAL landmarks demonstrated greater differences in inclination and anteversion.
  • The posterior interspinal line proved more accurate than acetabular rim and TAL for pelvic plane reference.

Conclusions:

  • The posterior interspinal line, derived from PSIS registration, is the most accurate landmark for pelvic plane determination in the lateral position.
  • Acetabular rim and TAL are less reliable alternatives for this specific application.
  • This finding has implications for improving surgical accuracy in hip and pelvic surgeries.