Final answer:
Petrissage beginning just distal to the medial condyle and moving proximal to the gluteal fold affects the gluteus maximus, gluteus medius, and gluteus minimus muscles.
Step-by-step explanation:
Thigh Muscles and Gluteal Region
The muscles affected by petrissage beginning just distal to the medial condyle and moving proximal to the gluteal fold are the gluteal muscles. Specifically, this type of massage technique affects the gluteus maximus, gluteus medius, and gluteus minimus.
The gluteus maximus is the largest muscle in the gluteal group. It is responsible for extending the femur. The gluteus medius and gluteus minimus are deeper muscles that work together to abduct the femur at the hip. These muscles help with movements such as moving the leg out to the side and stabilizing the pelvis when walking or running.