[en] Background: Low back pain is a common health problem, with great individual, social and economic impact. Different aspects of motor control, such as postural control or the quality of movement of the lumbar spine are impaired in these people. Several studies show a relationship between motor control deficit and low back pain. However, few standardized and reliable functional tests examine the motor dysfunctions of the lumbo-pelvic region. Objetive: To determine if there are differences in movement patterns in the frontal and sagittal planes of the lumbo-pelvic region in subjects with chronic low back pain and healthy subjects, through 4 motor control tests; and to analyze the reliability of these tests between novice and expert physiotherapists. Methods: Pilot study with 24 subjects, 11 with chronic low back pain and 13 healthy ones. They perform 4 selected motor control tests after review of the literature: Active Straight Leg Raise (ASLR), One Leg Stance (OLS), Prone Active Knee Flexion (PAKF) and Sitting Knee Extension (SKE). For the interobserver reliability study the tests were recorded on video in a single session; this was evaluated with the Kappa Index and the Intraclass Correlation Coefficient depending on the variable. The T-Student test was performed for independent samples; and the Pearson and Spearman correlation test. Outcomes: No significant differences were found between the groups. In some of the tests, the cases present worse motor control than the controls. There is a moderate correlation between lumbar pain intensity and the PAKF test on both sides (R = 0,4); and the SKE test on the left side (R = 0,4). The interobserver reliability was: for the ASLR of poor to moderate (κ=0,10-0,58); for moderate OLS (κ=0,46-0,56); and moderate to good for both the PAKF (κ=0,44-0,64) and the SKE test (κ=0,30-0,67). Conclusions: There is no clear difference between subjects with DL and healthy subjects with respect to their ability to actively control the 4 movement patterns of the lumbo-pelvic region studied. It is shown that the 4 motor control tests have moderate interobserver reliability. The best reliability was demonstrated for the SKE and PAKF tests, followed by the OLS test. When the evaluators previously agree on the criteria for scoring the tests, the degree of agreement between them is greater.

[gl] Introdución: A dor lumbar é un problema común de saúde, cun gran impacto individual, social e económico. Nestas persoas están afectados diferentes aspectos do control motor, como o control postural ou a calidade do movemento da columna lumbar. Varios estudos mostran unha relación entre o déficit de control motor e a dor lumbar. Non obstante, poucas probas funcionais estandarizadas e fiables examinan as disfuncións motrices da rexión lumbo-pélvica. Obxectivo: Determinar se existen diferenzas nos patróns de movemento nos planos frontal e saxital da rexión lumbo-pélvica en suxeitos con dor lumbar crónica e suxeitos sans, a través de 4 probas de control motor; e analizar a fiabilidade destas probas entre fisioterapeutas novatos e expertos. Material e método: Estudo piloto con 24 suxeitos, 11 con dor lumbar crónica e 13 sans. Realizan 4 probas de control motor seleccionadas despois da revisión da literatura: Elevación activa da perna recta (ASLR), Posición de apoio dunha perna (OLS), Flexión activa do xeonllo en posición de prona (PAKF) e Extensión de xeonllo sentada. SKE). Para o estudo da fiabilidade interobservador, as probas rexistráronse en vídeo nunha soa sesión; isto foi avaliado co Índice Kappa e co Coeficiente de Correlación Intraclase dependendo da variable. Realizouse a proba T-Student para mostras independentes; e os test de correlación de Pearson e Spearman. Resultados: Non se atoparon diferenzas significativas entre os grupos. Nalgunhas das probas, os casos presentan peor control motor que os controis. Hai unha correlación moderada entre a intensidade da dor lumbar e a proba PAKF en ambos os dous lados (R=0,4); e a proba SKE no lado esquerdo (R=0,4). A fiabilidade interobservador foi: para o ASLR de pobre a moderado (κ=0,10-0,58); para OLS moderada (κ=0,46-0,56); e de moderada a boa tanto para PAKF (κ=0,44-0,64); como para o test SKE (κ=0,30-0,67). Conclusións: Non se observa ningunha diferenza clara entre as persoas con DL e suxeitos sans con respecto á súa capacidade de controlar activamente os 4 patróns de movemento da rexión lumbo-pélvica estudada. Móstrase que as 4 probas de control motor teñen unha fiabilidade interobservador moderada. A mellor fiabilidade demostrouse para aa probas SKE e PAKF, seguida da proba OLS. Cando os avaliadores acordaron previamente os criterios para a puntuación das probas, o grao de acordo entre eles é maior.