FTA Angle and Pain in Osteoarthritis of the Knee

Angela BM Tulaar


Osteoarthritis (OA) is the most common joint disease that may cause physical, psychological and socioeconomical problems leading to disability and decreasing one’s quality of life. The muscles around the joint often develop atrophy and decrease in strength. To the weight bearing joints this can affect the joint stability. The knee joint is commonly involved in OA and women have higher prevalence compared to men. Pain is the main complaint and deformities may occur in advanced OA of the knee. The FTA angle (FTA) has been associated with valgus-varus deformity of the knee recently, as well as the disease progression. Yet, not much have been studied regarding the relation of the FTA angle with pain in Knee OA. The purpose of this study was to evaluate the FTA angle in knee OA and its relation to pain. Plain photo of 93 patients with knee OA grade 2-3 according to Kellgren-Lawrence and knee pain fulfilling the inclusion criteria were taken from previous studies related to osteoarthritis. The age of the patients ranges from 42 to 65 years with a mean of 54 years. Fifty one patients with right knee pain and 42 patients with left knee pain. The visual analoque scale (VAS) ranges from 4.5 to 8.4 with a mean of 6.31 (SD 1.07). The FTA angle (FTA) measured from the plain anterior posterior weight bearing radiography of the knee joint according to Toda’s method were as follows: the right FTA ranges from 165º to 186º with a mean of 174.05º (SD 3.6). The left FTA ranges from 167º to 194º with a mean of 176.64º (SD 5.14). Significant correlation (p=0.002) was found between FTA and age with a coefficient corellation of 0.30 (Pearson). A positive correlation with a 0.20 coefficient correlation (Spearman’s rho) was significant on p=0.02 between FTA and knee pain. It was cocluded that not all knee OA have FTA angle with abnormal ranges according to Toda, but there is significant positive correlation between FTA and knee pain.

Keywords: Osteoarthritis, FTA angle, pain.


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