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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 7, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

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

Functional acetabular component position with supine total hip replacement.

W Eilander1, S J Harris, H E Henkus

  • 1Haga Hospital, Sportlaan 600 2566MJ, The Hague, the Netherlands.

The Bone & Joint Journal
|October 1, 2013
PubMed
Summary
This summary is machine-generated.

Freehand placement of acetabular components during supine total hip replacement (THR) is reliable. This method accurately reflects functional standing cup position, minimizing variations due to pelvic tilt changes.

Keywords:
3D-CTAcetabular componentAnterior approachCupCup placementHipPelvic tiltSacral slopeSupineTotal hip prosthesis

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

Published on: February 27, 2018

Related Experiment Videos

Last Updated: May 7, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

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

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

Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Medical Imaging

Background:

  • Acetabular component orientation is critical for total hip replacement (THR) outcomes, affecting wear, range of motion, and dislocation risk.
  • Current surgical referencing to the anterior pelvic plane (APP) is complicated by significant individual variations in pelvic tilt.
  • The change in pelvic tilt from supine to standing (dPT) is minimal and consistent across most individuals.

Purpose of the Study:

  • To investigate the reliability of freehand acetabular component placement in the supine position during THR.
  • To determine if supine placement accurately reflects the functional (standing) cup position.
  • To assess the variability of acetabular component orientation and pelvic tilt changes.

Main Methods:

  • Utilized 3D CT pelvic reconstructions and standing lateral pelvic radiographs in 56 patients undergoing THR.
  • Analyzed acetabular component inclination and anteversion in the supine position.
  • Quantified pelvic tilt changes (dPT) from supine to standing in a subset of patients.

Main Results:

  • High reliability was observed, with 82% of implants placed within 30°-50° inclination and 5°-25° anteversion.
  • Pelvic tilt change (dPT) was less than 10° in 87% of patients.
  • Anteversion change from supine to standing was less than 10° in 96% of analyzed patients.

Conclusions:

  • Freehand acetabular component placement in the supine position during THR is a reliable surgical technique.
  • This method provides a consistent and reproducible functional cup position, minimizing intraoperative variability.
  • The small, predictable pelvic tilt change from supine to standing leads to a minor increase in anteversion, which is clinically manageable.