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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...
Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the neck...

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Related Experiment Video

Updated: May 20, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Acetabular component positioning using anatomic landmarks of the acetabulum.

Yong-Chan Ha1, Jeong Joon Yoo, Young-Kyun Lee

  • 1Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, Seoul, South Korea.

Clinical Orthopaedics and Related Research
|July 11, 2012
PubMed
Summary

A new technique for acetabular cup placement in total hip arthroplasty achieved accurate positioning. This method resulted in zero dislocations over a minimum of five years, improving patient outcomes.

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Published on: September 7, 2022

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Surgical Techniques

Background:

  • Accurate acetabular cup orientation is crucial in total hip arthroplasty (THA) to prevent dislocation and minimize wear.
  • Variations in cup placement pose a significant challenge, necessitating improved surgical techniques.

Purpose of the Study:

  • To introduce and evaluate a novel technique for precise acetabular cup positioning during THA.
  • To determine the actual cup position achieved using the new method and assess the subsequent rate of dislocation.

Main Methods:

  • Preoperative CT scans were used to measure acetabular abduction (α°) and anteversion (β°) in 46 patients undergoing THA.
  • A new technique involved identifying acetabular notches (TAN, AAN) and marking reference points on the acetabular rim to guide cup alignment for 40° abduction and 15° anteversion.
  • Cup abduction and anteversion were measured post-insertion, and dislocation rates were evaluated over a minimum 5-year follow-up period.

Main Results:

  • The mean cup abduction achieved was 40° (range, 32°-47°), and the mean cup anteversion was 17° (range, 8°-25°).
  • No postoperative dislocations occurred in 49 hips (45 patients) with a minimum follow-up of 5 years.

Conclusions:

  • The proposed technique enables adequate and accurate acetabular cup positioning in THA.
  • The method demonstrated a zero-dislocation rate over a minimum 5-year follow-up, indicating its clinical efficacy and safety.