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Related Concept Videos

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...
Knee Joint01:23

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

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Related Experiment Video

Updated: Jul 7, 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

Variations in acetabular anatomy with reference to total hip replacement.

P E Murtha1, M A Hafez, B Jaramaz

  • 1Institute for Computer Assisted Orthopaedic Surgery, The Western Pennsylvania Hospital, Suite 242, Mellon Pavillion, 4815 Liberty Avenue, Pittsburgh, Pennsylvania 15224, USA. pmurtha@icaos.org

The Journal of Bone and Joint Surgery. British Volume
|March 4, 2008
PubMed
Summary
This summary is machine-generated.

The native acetabulum

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

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Last Updated: Jul 7, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
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Published on: February 27, 2018

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Published on: September 7, 2022

Area of Science:

  • Orthopedic surgery
  • Radiology
  • Anatomy

Background:

  • Acetabular orientation is crucial for total hip replacement (THR) success.
  • Existing 'safe zone' guidelines for acetabular component placement may not reflect native anatomy.

Purpose of the Study:

  • To determine the native acetabular radius, depth, and orientation using 3D CT models.
  • To compare native acetabular orientation with the Lewinnek safe zone for THR.

Main Methods:

  • 3D surface models of the hemipelvis from CT scans of 42 patients.
  • Spherical fit to the lunate surface and planar fit to the acetabular rim for measurements.
  • Analysis of acetabular abduction, anteversion, radius, and normalized depth in males and females.

Main Results:

  • Mean native acetabular abduction was 57.1° (females) and 55.5° (males).
  • Mean native acetabular anteversion was 24.1° (females) and 19.3° (males).
  • Native acetabular orientation, particularly abduction, differs from the Lewinnek safe zone.

Conclusions:

  • The average native acetabular abduction angle exceeds the recommended safe zone angle.
  • Surgeons should consider reducing acetabular component abduction by ~10° compared to native anatomy during THR.
  • Accurate assessment of native acetabular parameters is vital for optimal implant positioning in total hip replacement.