Weight-bearing patterns on the knees of preterm infants

J. Mizrahi*, K. Katz, S. Davidson, E. Wielunsky, J. Minzly, M. Soudry

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this study we present a method of monitoring the forces under the knees of preterm infants lying in the prone position. Dual force sensing resistor transducers, connected to optically-isolated amplifiers, were used to monitor the forces. A thermistor airflow sensor was used for the parallel monitoring of the respiratory signal. The measurements were made on ten preterm infants. The average forces were 0.51 and 0.50 N for the left and right knees, respectively. In the frequency domain, the basic harmonic of the force traces was 1.27 Hz approximately, corresponding to the respiratory rhythm. Additional, smaller harmonics, were detected in the force traces at 2.54 and 3.81 Hz. A rather notable power signal could also be seen around 0.1 Hz. The results obtained indicate that the system developed is highly sensitive for providing data on the amplitudes, periods and sequences of oscillations and symmetry of load bearing in preterm infants. Knowledge of the normal and abnormal reaction force patterns may assist in the early diagnosis of abnormal neurodevelopment.

Original languageEnglish
Pages (from-to)625-628
Number of pages4
JournalMedical Engineering and Physics
Issue number8
StatePublished - Oct 1998
Externally publishedYes


FundersFunder number
Technion-Israel Institute of Technology


    • Neurodevelopment
    • Postural sway
    • Preterm infants
    • Reactive forces
    • Weight bearing


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