A muted hip refers to a range of functional limitations often characterized by reduced mobility or inability to fully engage in hip flexion and extension. The phrase suggests that the hip is unable to perform its full range of motion effectively, meaning that it doesn't function optimally in activities requiring dynamic movement. When considering this context, a permanently open hip that never closes or flexes accurately describes a muted hip, as it indicates a lack of typical functional movement patterns essential for various physical activities.
In contrast, the other options highlight characteristics that signify optimal hip function, such as complete flexibility, enhanced extension, or significant contributions to athletic performance. These traits contrast sharply with the limitations associated with a muted hip, which is hindered in its ability to adapt to the dynamic demands faced in athletic and daily movements.