Decreased Q-Angle: Abstract

Immediate Changes in the Quadriceps Femoris Angle After Insertion of an Orthotic Device
D. Robert Kuhn, DC, Terry R. Yochum, DC, Anton R. Cherry, and Sean S. Rodgers


To evaluate the effects of full-length, custom-made flexible orthotics (Spinal Pelvic Stabilizers) on quadriceps angle (Q-angle) in volunteers with bilateral foot hyperpronation.

Forty chiropractic student volunteers were selected. Inclusion criteria were asymptomatic, male, evidence of bilateral hyperpronation, and no history of ankle surgery. Custom-made, flexible orthotics were produced. Subjects’ Q-angles were measured before and after orthotic insertion.

Orthotic insertion demonstrated reduced Q-angle, in the direction of correction, in 39/40 test subjects.

Research suggests that the hyperpronated foot is an etiologic factor in many lower extremity complaints, including foot, knee, hip and low back pain. Literature indicates that custom-made, flexible orthotics can stabilize the pes planus foot and restore optimal degree of pronation. Reduced pronation decreases the amount of tibial and femoral internal rotation, with subsequent Q-angle reduction.

Full-length, flexible orthotics significantly improve the Q-angle in hyperpronating male patients and offer the possibility of long-term benefits.

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