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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...
Articulations of the Vertebral Column01:28

Articulations of the Vertebral Column

In addition to being held together by the intervertebral discs, adjacent vertebrae also articulate with each other at synovial joints formed between the superior and inferior articular processes called zygapophysial joints (facet joints). These are plane joints that provide for only limited motions between the vertebrae. The orientation of the articular processes at these joints varies in different regions of the vertebral column and serves to determine the types of motions available in each...

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Related Experiment Video

Updated: May 22, 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

Does standing affect acetabular component inclination and version after THA?

Gregory G Polkowski1, Ryan M Nunley, Erin L Ruh

  • 1Department of Orthopedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, CT, USA.

Clinical Orthopaedics and Related Research
|May 22, 2012
PubMed
Summary
This summary is machine-generated.

Standing imaging significantly alters acetabular component positioning measurements after hip arthroplasty (THA/SRA) compared to supine views. These changes in inclination and version are crucial for assessing hard-bearing implant complications.

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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 22, 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
  • Biomedical imaging
  • Implant arthroplasty

Background:

  • Acetabular component position is critical for preventing complications in hip arthroplasty with hard-on-hard bearings.
  • Traditional supine imaging may not accurately reflect component position under physiological loading conditions.
  • Adverse events like wear and squeaking in metal-on-metal bearings are associated with loading.

Purpose of the Study:

  • To determine if standing imaging alters standard acetabular component position measurements compared to traditional supine imaging.
  • To evaluate the utility of a novel biplanar imaging system for assessing component position in standing patients.
  • To compare acetabular inclination and anteversion measurements between supine and standing positions.

Main Methods:

  • Simultaneous biplanar standing imaging with a low-radiation system was performed on 46 patients (23 THA, 23 SRA).
  • Conventional CT scans were used for THA patients, while SRA patients had acetabular inclination compared in supine, double-limb, and single-limb standing positions.
  • A novel biplanar imaging system was utilized for standing assessments.

Main Results:

  • Standing anteversion differed by >5° in 12/23 THA patients (range 5°-16°).
  • For SRA patients, 13/23 showed >3° inclination difference between supine and double-limb standing.
  • Six of 23 SRA patients exhibited >3° inclination difference between supine and single-limb standing.

Conclusions:

  • Standing imaging significantly changes acetabular inclination and version measurements in a substantial portion of hip arthroplasty patients.
  • These findings highlight the importance of weight-bearing imaging for accurate assessment of acetabular component positioning.
  • The study suggests standing imaging may provide more clinically relevant data for hard-bearing hip implants.