Related Experiment Videos
Normal range of fetal knee movements
1Orthopedic Surgery Unit, Schneider Children's Medical Center of Israel, Petah Tiqva.
Journal of Pediatric Orthopedics
|November 26, 1999
Summary
This study objectively defines normal fetal knee motion using ultrasound, establishing key flexion and extension ranges for fetuses aged 16-39 weeks. These findings aid in diagnosing fetal neuromusculoskeletal conditions.
Area of Science:
- Prenatal Medicine
- Fetal Development
- Musculoskeletal Ultrasound
Background:
- Fetal limb movement abnormalities are currently described subjectively.
- Objective quantification of fetal knee motion is lacking in medical literature.
Purpose of the Study:
- To objectively define the normal range of fetal knee motion.
- To establish reference values for fetal knee flexion and extension throughout gestation.
Main Methods:
- Utilized routine prenatal ultrasound scans on 240 normal fetuses (16-39 weeks gestational age).
- Measured angles of midtibia, midfemur, and midknee during maximum flexion and extension.
- Correlated measurements with gestational age.
Main Results:
- Between 16-32 weeks: average knee flexion 129.4° (120-140°), average extension 23.7° (15-40°).
- From 33-39 weeks, a decrease in knee extension was observed due to uterine space limitations.
Conclusions:
- Provides objective, quantitative data on normal fetal knee motion.
- Establishes a benchmark for identifying potential fetal knee abnormalities.
- Assists clinicians in the prenatal diagnosis of neuromusculoskeletal disorders.