Related Experiment Videos
Range of knee motion in normal neonates
N S Broughton1, J Wright, M B Menelaus
1Department of Orthopaedics, Royal Children's Hospital, Melbourne, Australia.
Insights
Normal neonates show decreasing knee flexion contracture and range of motion from birth to 6 months. This natural history is crucial for understanding neuromuscular disorders in infants.
Area of Science:
- Pediatrics
- Orthopedics
- Developmental Biology
Background:
- Neonatal musculoskeletal development is critical.
- Understanding normal joint motion is essential for diagnosing developmental abnormalities.
- Limited data exists on the natural progression of knee motion in healthy infants.
Purpose of the Study:
- To document the natural history of knee motion and hip flexion contracture in normal neonates.
- To establish normative values for knee range of motion and hip flexion contracture in early infancy.
- To provide a baseline for interpreting aberrant joint findings in pediatric neuromuscular conditions.
Main Methods:
- Prospective observational study.
- Involved 57 healthy neonates examined at birth, 3 months, and 6 months corrected age.
- Measured range of knee motion and hip flexion contracture using standardized clinical assessments.
Main Results:
- Mean knee flexion contracture decreased from 21.4° at birth to 10.7° at 3 months and 3.3° at 6 months.
- A corresponding decrease in the range of knee flexion was observed during the same period.
- Individual variations were noted, but the overall trend indicated progressive improvement in knee mobility.
Conclusions:
- Normal knee motion and hip flexion contracture undergo significant changes in the first six months of life.
- These findings establish normative developmental trajectories for knee joint mobility.
- This data is vital for the accurate diagnosis and management of pediatric neuromuscular disorders affecting lower limb function.
Abstract:
Fifty-seven normal neonates were examined at birth and at 3 and 6 months (to within 7 days). Range of knee motion and of hip flexion contracture were measured. Mean knee flexion contracture was 21.4 degrees at birth, reducing to 10.7 degrees at 3 months and 3.3 degrees at 6 months. Decreasing range of knee flexion was noted in the same period. The natural history of normal knee motion is important in interpreting findings in patients with neuromuscular disorders.