Valgo dinâmico de joelho no drop vertical jump test: qual a melhor forma de avaliar?

Abstract

Dynamic knee valgus (DKV) is an abnormal movement of the knee in relation to the foot that occurs during functional activities and it is related to patellofemoral pain syndrome, anterior cruciate ligament lesion and iliotibial band syndrome. At Drop Vertical Jump Test (DVJT), DKV suffers little hip influence because this is a bipodal test, but there are ways to measure the DKV in which the hip is considered. Objectives: Determine the best form of quantitative evaluation of DKV in the DVJT between two techniques and verify the validity of the qualitative evaluation in relation to the quantitative one. Methods: A cross-sectional sample study with 78 athletes of both genders of three sports modalities. Each athlete performed three valid repetitions of the test and the videos were analyzed through the Kinovea® Software in three ways: positive or negative DKV, angle formed between hip, knee and ankle (APPF) lines and angle formed between a line perpendicular to the ground and another knee to ankle (ABT). Results: ABT evaluation showed a very high correlation (r=0.90, p<0,01) with the APPF evaluation. Positive and negative athletes presented significant differences among the ABT scores (positive: 8.64 ° ± 4.75 °, negative: -3.90 ° ± 7.12 °, p<0,01) and APPF (positive: 5.75 ° ± 6.44 °, negative: -17.36 ° ± 12.70 °, p<0,01). Both tests had high diagnostic accuracy. Conclusion: The results of this study show that the two ways of evaluating DKV, drawing the lines between hip, knee and ankle or only between knee and ankle, presented good correlation with each other and excellent levels of sensitivity and specificity.