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Related Concept Videos

Anatomical Positions01:11

Anatomical Positions

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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:
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The thigh's motion is primarily governed by muscles originating in the pelvic girdle and inserted into the femur. One crucial muscle, the iliopsoas, is a combination of the psoas major and the iliacus muscles, sharing a common insertion point on the lesser trochanter of the femur.
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Related Experiment Video

Updated: Apr 27, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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Pelvic position and movement during hip replacement.

G Grammatopoulos1, H G Pandit1, R da Assunção2

  • 1University of Oxford, NDORMS, Windmill Road, Headington, Oxford, OX3 7LD, UK.

The Bone & Joint Journal
|July 3, 2014
PubMed
Summary
This summary is machine-generated.

Patient positioning and pelvic movement during hip replacement significantly impact acetabular component orientation. Inconsistent patient setup and intraoperative pelvic shifts contribute to variability in final implant positioning, necessitating improved fixation methods.

Keywords:
Hip arthroplastyMovementOrientationPelvis

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Surgical Navigation

Background:

  • Acetabular component orientation is crucial for successful hip replacement outcomes.
  • Pelvic orientation at the time of implantation significantly influences final component alignment.
  • Variability in pelvic positioning and movement can lead to suboptimal implant placement.

Purpose of the Study:

  • To quantify pelvic orientation and movement during hip replacement surgery.
  • To assess the impact of patient positioning and pelvic dynamics on acetabular component orientation.
  • To identify factors contributing to variability in acetabular component placement.

Main Methods:

  • A photogrammetric technique was used to measure pelvic orientation and movement in 67 hip replacement surgeries.
  • Data collected included pelvic tilt, obliquity, and rotation at set-up and during component implantation.
  • Surgeon, surgical approach, procedure type, and support were analyzed as factors influencing pelvic movement.

Main Results:

  • Significant variations in pelvic orientation were observed at set-up, differing between surgeons (p < 0.001).
  • Mean pelvic movement between set-up and implantation was 9° (sd 6), influenced by surgeon, approach, procedure, and support (p < 0.001).
  • Considerable variability (2sd ± 16) in final acetabular component orientation was noted, despite surgeons aiming for specific alignments.

Conclusions:

  • Inconsistent patient positioning and intraoperative pelvic movement are major contributors to the variability in acetabular component orientation.
  • Current methods for positioning and stabilizing the pelvis during hip replacement surgery are inadequate.
  • Improved techniques for pelvic positioning and fixation are required to enhance acetabular component placement accuracy.