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Q-angle in patellofemoral pain: relationship with dynamic knee valgus, hip abductor torque, pain and function

PainSci » bibliography » Almeida et al 2016
Tags: patellar pain, biomechanics, arthritis, aging, pain problems, knee, leg, limbs, overuse injury, injury, running, exercise, self-treatment, treatment, etiology, pro

One article on PainSci cites Almeida 2016: Patellofemoral Tracking Syndrome

PainSci commentary on Almeida 2016: ?This page is one of thousands in the bibliography. It is not a general article: it is focused on a single scientific paper, and it may provide only just enough context for the summary to make sense. Links to other papers and more general information are provided wherever possible.

In this study of 22 women with patellofemoral pain, the steepness of their Q-angle did not correlate with pain, function, hip strength, or wonky knee movement in flexion. This adds to the now substantial pile of evidence that the Q-angle in itself has little or nothing to do with patellofemoral pain.

~ Paul Ingraham

original abstract Abstracts here may not perfectly match originals, for a variety of technical and practical reasons. Some abstacts are truncated for my purposes here, if they are particularly long-winded and unhelpful. I occasionally add clarifying notes. And I make some minor corrections.

OBJECTIVE: To investigate the relationship between the q-angle and anterior knee pain severity, functional capacity, dynamic knee valgus and hip abductor torque in women with patellofemoral pain syndrome (PFPS).

METHODS: This study included 22 women with PFPS. The q-angle was assessed using goniometry: the participants were positioned in dorsal decubitus with the knee and hip extended, and the hip and foot in neutral rotation. Anterior knee pain severity was assessed using a visual analog scale, and functional capacity was assessed using the anterior knee pain scale. Dynamic valgus was evaluated using the frontal plane projection angle (FPPA) of the knee, which was recorded using a digital camera during step down, and hip abductor peak torque was recorded using a handheld dynamometer.

RESULTS: The q-angle did not present any significant correlation with severity of knee pain (r = -0.29; p = 0.19), functional capacity (r = -0.08; p = 0.72), FPPA (r = -0.28; p = 0.19) or isometric peak torque of the abductor muscles (r = -0.21; p = 0.35).

CONCLUSION: The q-angle did not present any relationship with pain intensity, functional capacity, FPPA, or hip abductor peak torque in the patients with PFPS.

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