Correlation between the Q angle and the isokinetic knee strength and muscle activity

Abstract

Objectives: The aim of this study was to investigate the correlation between the Q angle and the isokinetic knee strength and muscle activity. Patients and methods: Between March 2016 and April 2016, a total of 50 healthy and right-leg dominant men (mean age 22.3±2.3 years; range, 18 to 27 years) with a Q angle between 5° and 20° and active in sports were included. An isokinetic strength test of the knee joint extensor and flexor muscles at angular velocities of 60, 120, 180, 240, and 300°•s-1 was tested who had a Q angle of 5 to 20° and were active in sports. Surface electromyography (sEMG) was used to determine these muscles' activity levels. Results: Negative correlations were between the Q angle and the average peak torque (APT) in extension (E) and flexion (F) , the average power (AP E,F) at all angles, the joint angle at the PT (JAPT E) at 240, 180, 120 and 60°•s-1 ; JAPT F at 300, 240 and 180°•s-1 ; and the time to PT (TPT F) at 180°•s-1. There was a positive correlation between the Q angle and TPT E (at 60°•s-1). No significant relationship between the Q angle and the level of EMG activity at any angular velocity of the muscles, as well as the VM:VL EMG activity ratio was found. Conclusion: A higher Q angle is associated with decreased isokinetic knee strength, power output, and torque angles. It is thought that possible high Q angle-related knee joint disorders and sports injuries can be avoided by including proper quadriceps strength exercises in exercise prescriptions to be prepared.

Determining the relationship between the quadriceps and tibiofemoral angles among adolescents

“…Most researchers found that engaging in a regular sports practice with high lower limb activities would cause the Q-angle to be lower than normal. 31 This was consistent with our results, as group A, who played sports, had lower values than group B. This could be explained by the means of quadriceps muscle strength, in which the higher the muscle strength, the lower the Q-angle.…”

“…This could be explained by the means of quadriceps muscle strength, in which the higher the muscle strength, the lower the Q-angle. 31 …”

Does the Early and Late Rate of Torque Development, Change in Relation to the Quadriceps Angle?

“…Comparing torque, work and power outputs, Q angle was found to be negatively related to torque and power (Binder, Brown-Cross, Shamus, & Davies, 2001;Hahn & Foldspang, 2007). Our previous study also supports these results (Saç & Taşmektepligil, 2018).…”

Profile of Knee MRI Morphometric Risk Factors for Anterior Cruciate Ligament Tear at Dr. Soetomo General Academic Hospital

“…The Q-angle in ACL tear indicates the inferior extremity alignment and indicates that the valgus shape of knee joint in the case group had a smaller mean value compared to the control group. 10,17 It is inconsistent with study by Bayer et a and Sac et al which found that larger Q-angle can increased dynamic valgus and high abduction loads of the knee. 10,17 The case group had a lower MTPS score with a mean value of 9.24±2.73 than the control group, with a mean value of 7.7024±3.53.…”

“…However, various measurement techniques and methods of these anatomical factors are still debatable. 1,2,[9][10][11]13,[15][16][17]18 This study aims to provide an overview of anatomical risk factor characteristics in knee joint MRI study.…”