Minor change in the sulcus angle during the first six years of life: A prospective study of the femoral trochlea development in dysplastic and normal knees
Journal article, Peer reviewed
Published version
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Date
2018Metadata
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Original version
Journal of Children's Orthopaedics. 2018, 12 (3), 245-250. 10.1302/1863-2548.12.180026Abstract
Purpose
The aetiology of femoral trochlear dysplasia is unknown. The aim of this prospective cohort study was to describe trochlear development in a newborn population during the first six years of life.
Methods
In an earlier study, the femoral trochlea was examined by ultrasound in 174 newborns. A dysplastic trochlea was defined with a sulcus angle (SA) above 159°. Two groups were defined, one group of 15 knees with SA > 159° (dysplastic group), and one group of 101 knees with SA < 159° (non-dysplastic group). In the present follow-up study, the children were further examined at six, 18 and 72 months.
Results
There was a statistically significant difference in the SA between the dysplastic and the non-dysplastic group at all follow-ups (p < 0.001). A small but statistically significant change in the SA between 0 to 72 months was detected for the dysplastic knees (p = 0.032) and for the controls (p < 0.001).
Conclusion
Only minor changes in the anatomy of the femoral trochlea from newborn to age six years were found. A dysplastic trochlea at birth remains shallow and the anatomy does not change from normal to dysplastic during the same time span.
Level of Evidence
II