400 Section - Association of Pes Planus and Hallux Valgus Deformity with the Functional Status of Knee Osteoarthritis Patients.

Objectives : The primary objective of this study was to determine the association of Pes Planus and Hallux Valgus with functional status of patients with knee osteoarthritis.

Design: This was a prospective analytical, cross sectional study examining patients 60 years old and above diagnosed with knee Osteoarthritis. Functional assessment was assessed using Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) questionnaire. AP and lateral foot standard radiographs were obtained. A lateral talometatarsal angle greater than 4° was defined as pes planus. A hallux valgus angle greater than 21° was defined as hallux valgus.

Results:

 

Patients without pes planus and without hallux valgus (40.5%) had significantly lower scores on WOMAC overall, and across pain, stiffness, and physical function. Pes planus (38.20%) is associated with higher WOMAC scores, even after adjusting for age, sex, and BMI of patients (p < 0.001). Patients with hallux valgus (21.35%) is likely to have worse WOMAC scores than those without (p = 0.009), but this association was not sustained after adjusting for age, sex, and BMI. There is a moderate and direct correlation between WOMAC overall total scores with lateral talometatarsal angle and hallux valgus angle (p < 0.001), as well as pain subscale with the lateral talometatarsal angle. There is a weak and direct correlation between pain domain and hallux valgus angle, as well as stiffness and physical function subscales with both lateral talometatarsal angle and hallux valgus angle.

Conclusion: The study was able to demonstrate the correlation of Pes Planus and Hallux Valgus deformity with moderate and direct correlation with overall WOMAC disability scores (p < 0.001). The early identification of these foot deformities with simple conventional radiographs, especially in those patients at risk, would allow the clinician to provide an individualized and targeted treatment approach in order to improve the quality of life of our patients.