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The Relationship Between Q-Angle and Anterior Knee Pain in Lebanese Population

Abstract

Background and objective: The knee is a complex structure and its evaluation can present a challenge to the clinicians. The quadriceps angle (Q-angle) assessment is an integral part of such a procedure, as Q-angle influences patella tracking which is necessary for smooth knee joint. The aim of this study was determining a normal value of Q-angle in Lebanese people, and to evaluate the relationship between the anterior knee pain and Q-angle by comparing measured values of left and right Q-angles done on females to examine whether bilateral similarities or differences exist between a group of symptomatic controls and those asymptomatic for anterior knee pain (AKP). Methods: Forty five (45) female subjects, age range between 18 and 25 years participated in this study. They were divided into two groups: asymptomatic subjects (control group) and symptomatic subjects complains of unilateral AKP in the right limb. The Q-angle of the subjects was measured in the standing (weight bearing) position and supine (non-weight bearing) position. The differences in the Q-angles within and between the groups were analyzed using the independent t-test. Results: The results showed a non-significant difference between symptomatic and asymptomatic groups, and between right and left Q-angle (p>0.05).while there was significant difference between weight bearing and non-weight bearing Q-angle (P<0.0001). On the other hand there was no correlation between Q-angle and; hip anteversion; demographic and anthropometric data (weight, height, limb length); and visual analogue scale (V.A.S) Conclusion: We found that there was no relationship between Q-angle and anterior knee pain. The mean normal Q-angle is comparable to the currently accepted data and the higher normal value for women is slight different to other studies. Also, we found bilateral symmetry of Q-angle but it differs in weight bearing and non-weight bearing positions. Therefore, the Q-angle is an invaluable parameter in the evaluation of patients with anterior knee pain.

Student(s)

Lilas Khraiwish- Israa Koaik-Ahmad Darwish- Hadi Khashab

Supervisor(s)

Dr. Hatem Al Rifai