The innovative design on our new Modular Ring Lock Knee Joint minimizes size and weight without compromising strength or durability. Universal coronal and sagittal contours reduce the overall profile of the joint to enhance the cosmesis of your orthotic design. The ring has been designed to improve grip for patients with poor hand dexterity and increase rigidity to resist stretching over time. Optional ball catches (included) can be easily installed at any time without machining or the use of specialized tools.Model 1402 midsections and uprights are sold separately. Midsections come completely assembled with rings and optional ball catch components. All upright sets include two proximal uprights and two distal uprights with attachment screws.