Related Experiment Video

Updated: Apr 21, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

2.8K

Natural history of hip instability in infants (without subluxation or dislocation): a three year follow-up

Blazej Pruszczynski, H Theodore Harcke, Laurens Holmes

  • 1Department of Orthopedics, Nemours/Alfred I, duPont Hospital for Children, 1600 Rockland Rd, Wilmington, DE 19803, USA. Richard.Bowen@nemours.org.

BMC Musculoskeletal Disorders
|October 29, 2014
PubMed

Insights

Infant hip instability often resolves naturally, with most cases normalizing acetabular index within three years. Breech presentation and C-section delivery are linked to delayed normalization.

Area of Science:

  • Pediatric Orthopedics
  • Developmental Dysplasia of the Hip
  • Medical Imaging

Background:

  • The natural history and treatment of infant hip instability without dislocation remain debated.
  • This study investigates untreated infant hips diagnosed with sonographic instability.

Purpose of the Study:

  • To assess the spontaneous normalization of the acetabular index in infants with hip instability.
  • To identify factors influencing the timeline of acetabular index normalization.

Main Methods:

  • Retrospective cohort study with prospectively collected, blinded data.
  • Sonography and radiography were used to follow 48 infant hips.
  • Tabular and regression models analyzed normalization patterns and correlations.

Main Results:

  • Acetabular index normalized in 100% of hips within 3 years without treatment.
  • Normalization occurred by 7 months (35%), 12 months (67%), 18 months (75%), 24 months (81%), and 36 months (100%).
  • Breech presentation and cesarean delivery correlated with delayed normalization.

Conclusions:

  • Infant hip instability, as diagnosed by the Harcke method, shows spontaneous acetabular index normalization within 3 years.
  • Three patterns of acetabular ossification were observed: normal, delayed, and defective.
  • Understanding these patterns aids in managing infant hip instability.
Abstract

More Related Videos

Author Spotlight: A Novel 3D-Printed Titanium Implant for Minimally Invasive Treatment of Hip Dysplasia in Young Dogs08:40

Author Spotlight: A Novel 3D-Printed Titanium Implant for Minimally Invasive Treatment of Hip Dysplasia in Young Dogs

Published on: April 19, 2024

4.0K
The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve09:51

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

3.0K

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...
8.0K
Ankle Joint01:10

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
3.3K
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...
3.4K
Introduction to Joints00:58

Introduction to Joints

The adult human body usually has 206 bones, and except for the hyoid bone in the neck, each bone is connected to at least one other bone. Joints are the location where bones come together. Many joints allow for movement between the bones. At these joints, the articulating surfaces of the adjacent bones can move smoothly against each other. However, the bones of other joints may be joined by connective tissue or cartilage. These joints are designed for stability and provide little or no...
4.7K
Functional Classification of Joints01:09

Functional Classification of Joints

Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
7.9K
Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
4.9K