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Vol. 62. Issue 6.
Pages 442-447 (November - December 2018)
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Vol. 62. Issue 6.
Pages 442-447 (November - December 2018)
Original Article
DOI: 10.1016/j.recote.2018.10.001
Normal values of 3 methods to determine patellar height in children from 6 to 12 years
Valores normales de 3 métodos para determinar rótula alta en niños de 6 a 12 años
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E. Vergara-Amador
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enriquevergaramd@gmail.com

Corresponding author.
, D. Davalos Herrera, O.A. Guevara
Unidad de Ortopedia, Departamento de Cirugía, Universidad Nacional de Colombia, Fundación Hospital de la Misericordia, Bogotá, Colombia
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Figures (2)
Tables (9)
Table 1. Evaluation of concordance according to interclass correlation coefficient values.
Table 2. Interobserver evaluation for the Blackburne–Peel method (normal values: 0.8–1.0).
Table 3. Interobserver evaluation for the Caton–Deschamps method (normal values: 0.6–1.3).
Table 4. Interobserver evaluation for the Koshino–Sugimoto method (normal values: 0.99–1.2 for knees flexed at 30–90°).
Table 5. Interobserver intraclass correlation coefficient.
Table 6. Intraobserver evaluation for the Blackburne–Peel method (normal values: 0.8–1.0).
Table 7. Intraobserver evaluation for the Caton–Deschamps method (normal values: 0.6–1.3).
Table 8. Intraobserver evaluation for the Koshino–Sugimoto method (normal values: 0.99–1.2 for knees flexed from 30° to 90°).
Table 9. Intraobserver intraclass correlation coefficient.
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Abstract

The aim of the study was to compare three methods for high-score measurement in children, Caton–Deschamps, Blackburne–Peel and Koshino–Sugimoto, to determine the normal value of each method in a group of normal children.

Materials and methods

A cross-sectional study on knee X-rays of normal children. Three orthopaedic surgeons measured the Caton–Deschamps, Blackburne–Peel and Koshino–Sugimoto indices. Concordance was assessed using the intraclass correlation coefficient. For interobserver variability, the measurements of each observer for each index were compared and for intraobserver variability, the coefficient between the 2 measurements was calculated by the same observer at 2 different times.

Results

140 knee X-rays divided into 4 age groups were obtained. For the Blackburne–Peel index, an average median of the 3 observers was obtained of 1.07 and with P5–P95 (0.76–1.60). For the Caton–Deschamps index, an average median of the three observers of 1.22 was obtained and with P5–P95 (0.91–1.70). For the Koshino–Sugimoto index, we obtained an average median of the 3 observers of 1.16 and with P5–P95 (0.99–1.36).

Discussion

This study shows that the Koshino–Sugimoto index had the highest reliability, reproducibility and similarity in the population studied, both intraobserver and interobserver.

The other methods evaluated also had variability indices to be taken into account, but were inferior to the Koshino–Sugimoto index.

Keywords:
Patella
Child
Radiology
Cerebral palsy
Resumen

El objetivo del estudio es comparar 3 métodos para medición de rótula alta en niños, Caton-Deschamps, Blackburne-Peel y Koshino-Sugimoto, y determinar cuál es el valor normal de cada método en un grupo de niños normales.

Materiales y métodos

Es un estudio de corte transversal en radiografías de rodillas de niños normales. Tres cirujanos ortopédicos midieron los índices de Caton-Deschamps, Blackburne-Peel y Koshino-Sugimoto. Se realizó la evaluación de la concordancia mediante el coeficiente de correlación intraclase. Para la variabilidad interobservador, se compararon las mediciones de cada observador para cada índice y para la variabilidad intraobservador se calculó el coeficiente entre las 2 mediciones por un mismo observador en 2 momentos diferentes.

Resultados

Se obtuvieron 140 radiografías de rodilla divididas en 4 grupos etarios. Para el índice de Blackburne-Peel se obtuvo una mediana en promedio de los 3 observadores de 1,07 y con P5-P95 (0,76-1,60). Para el índice de Caton-Deschamps se obtuvo una mediana en promedio de los 3 observadores de 1,22 y con P5-P95 (0,91-1,70). Para el índice de Koshino-Sugimoto se obtuvo una mediana en promedio de los 3 observadores de 1,16 y con P5-P95 (0,99-1,36).

Discusión

Este estudio muestra que el índice de Koshino-Sugimoto fue el de mayor fiabilidad, reproducibilidad y similitud en la población estudiada tanto intraobservador como interobservador.

Los otros métodos evaluados también presentan unos índices de variabilidad a tener en consideración pero inferiores al de Koshino-Sugimoto.

Palabras clave:
Rótula
Niño
Radiología
Parálisis cerebral

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