A knee brace immobilizer that's 22 inches long is likely designed to provide stability and support to the knee joint while restricting certain movements to aid in recovery from injury or surgery. It may feature adjustable straps or hinges to customize the fit and level of support needed. This type of brace is commonly used for conditions like ligament sprains, meniscus tears, or post-operative care. It's important to consult with a healthcare professional to determine if this specific type of brace is suitable for your condition and to receive proper fitting instructions.