People who live an extremely active lifestyle, such as participating in sports or running for fitness, a properly positioned lower extremity is very important. The load distribution at the knee may be affected by the lower extremity position, thus subjecting the anterior cruciate ligament to more stress. The current study is aimed at assessing the relationship between lower extremity alignments like the pelvic angle, genu recurvatum, and medial & lateral rotation of the hip in patients with osteoarthritis, and quadriceps tendinitis. The study included 150 asymptomatic (control) male and female patients as well as 150 patients with osteoarthritis, or quadriceps tendinitis. Clinical assessment was done to measure the pelvic angle, genu recurvatum, and medial & lateral rotation of the hip by following standard procedures. The results of the study showed that there was a significant difference in the pelvic angle, but there was no significant difference in the genu recurvatum, medial & lateral rotation of the hip. The conclusion of the study was that the pelvic angle was affected, but the genu recurvatum and medial & lateral of the hip were not affected in the patients with osteoarthritis, and quadriceps tendinitis