That may be the case, but might be more than the quad impacting what is going on. But nothing wrong with trying to strengthen all the muscles that support knee joint. Including hamstrings and glutes, we often forget about the posterior chain a.k.a. backside in favor of like the front muscles, but it all works in tandem. And even core strengthening exercises, they can support your skeletal system and take the load off your lower body when your trunk is strong. Everything else is supported..... I know I am biased because I'm a Pilates instructor. 😉