What is the SERF Strap? The SERF Strap is the first patellofemoral brace designed to treat PFP due to poor hip control. Basically, the strap is a really long elastic band that you anchor at the knee (my term is foundation 1), tension over the outside of the thigh, and anchor around the pelvis (foundation 2). When you create these anchor points, the strapped leg will now have support for external rotation at the hip joint.  This reduces pelvic drop and knee valgus.  You can take someone whose knees hit together and immediately correct this dysfunction. While the marketing material and websites talk just about patellofemoral pain, I use this tool for symptoms in the leg (sometimes the back) during the stance phase of running or walking. This includes injuries like posterior tibialis tendinopathy, adductor longus and gluteus medius injury, and trochanteric bursitis. For athletes, I prescribe it as an