What syndrome is likely responsible for lateral hip pain in a patient with tenderness on the outer thigh?

Greater Trochanteric Pain Syndrome is the most likely cause of lateral hip pain accompanied by tenderness on the outer thigh. This syndrome encompasses a variety of conditions related to pain around the greater trochanter of the femur, which is the bony prominence on the outer part of the hip. The pain often arises from structures such as the gluteus medius and minimus tendons or the bursa surrounding the hip joint.

In this case, the tenderness on the outer thigh is characteristic of greater trochanteric pain syndrome, often linked with activities that involve repetitive hip motion or standing for prolonged periods. It is a common issue among middle-aged individuals and athletes, specifically those involved in running or other sports that place stress on the hip.

While iliotibial band syndrome and trochanteric bursitis can also present with lateral hip pain, they do not entirely encapsulate the broader spectrum of issues included in greater trochanteric pain syndrome, making it the more encompassing and likely diagnosis. Hip osteoarthritis typically presents with deeper joint pain, restrictions in motion, and morning stiffness, differing from the localized tenderness noted in this case.