Knee Braces Because of the high incidence of injury to the knee Joint, manufacturers have designed a host of different knee braces for a variety of purposes. Protective knee braces are used prophylactically to prevent injuries to the medial collateral ligament in contact sports such as football (Figure 6-27A). Although these protective braces have been widely used in the past, the American Orthopedic Society for Sports Medicine has expressed concern about their efficacy in reducing injuries to the collateral ligaments Several studies have actually shown an increase in the incidence of injures to the medial collateral ligament in athletes wearing these braces. Functional knee braces may be worn both during and following the rehabilitative period to provide support during functional activities. (Figure 6-27b) Functional braces can be purchased ready-made or can be custom made. Some physicians strongly recommend that their patients consistently wear these braces during physical activity whereas others do not feel that they are necessary.