MEASUREMENT OF THE FORCES AND MOVEMENTS INVOLVED IN NEONATAL HIP TESTING

YW CHOW, I TURNER, George Kernohan, RAB MOLLAN

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The screening for Developmental Dysplasia of the Hip in infants relies on the two manipulative tests developed by Ortolani(6) and Barlow(7) which are often poorly performed. This study investigated the forces applied and the sequences of physical manoeuvres underlying the tests in order to define a standard of safe practice. Eight subjects examined the hips of two training models that closely simulated the behaviour of a range of infant hip pathologies. The forces applied and transducer system. The analysis concentrated on the peak forces and the biomechanical conditions necessary to detect an abnormality. The models' legs had to be abducted beyond certain critical angles in order to dislocate and relocate an unstable femoral head and the magnitude of the force required to dislocate the femoral head was significantly less than the peak force applied (72 N vs 33 N, p < 0.001). Also, the Palmen(8) test, a less well known technique, provided the same level of diagnostic performance as the Barlow test but with a lower peak applied force (28 N vs 47 N, p < 0.001). Changes are therefore necessary to the training programmes for medical staff to ensure that the range of abduction during the manoeuvres is large enough to encompass the likely range of critical angles and that the forces applied are just sufficient so as not to overstress the joints.
LanguageEnglish
Pages181-187
JournalMedical Engineering and Physics
Volume16
Issue number3
Publication statusPublished - May 1994

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Hot isostatic pressing
Thigh
Hip
Hip Dislocation
Medical Staff
Testing
Pathology
Transducers
Leg
Screening
Joints
Education

Cite this

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title = "MEASUREMENT OF THE FORCES AND MOVEMENTS INVOLVED IN NEONATAL HIP TESTING",
abstract = "The screening for Developmental Dysplasia of the Hip in infants relies on the two manipulative tests developed by Ortolani(6) and Barlow(7) which are often poorly performed. This study investigated the forces applied and the sequences of physical manoeuvres underlying the tests in order to define a standard of safe practice. Eight subjects examined the hips of two training models that closely simulated the behaviour of a range of infant hip pathologies. The forces applied and transducer system. The analysis concentrated on the peak forces and the biomechanical conditions necessary to detect an abnormality. The models' legs had to be abducted beyond certain critical angles in order to dislocate and relocate an unstable femoral head and the magnitude of the force required to dislocate the femoral head was significantly less than the peak force applied (72 N vs 33 N, p < 0.001). Also, the Palmen(8) test, a less well known technique, provided the same level of diagnostic performance as the Barlow test but with a lower peak applied force (28 N vs 47 N, p < 0.001). Changes are therefore necessary to the training programmes for medical staff to ensure that the range of abduction during the manoeuvres is large enough to encompass the likely range of critical angles and that the forces applied are just sufficient so as not to overstress the joints.",
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MEASUREMENT OF THE FORCES AND MOVEMENTS INVOLVED IN NEONATAL HIP TESTING. / CHOW, YW; TURNER, I; Kernohan, George; MOLLAN, RAB.

In: Medical Engineering and Physics, Vol. 16, No. 3, 05.1994, p. 181-187.

Research output: Contribution to journalArticle

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