An Aircast is a specialized orthopedic support device designed to stabilize an injured limb, most commonly the ankle and lower leg, while promoting healing. It differs from traditional casts by integrating pneumatic support, which uses air to provide customized compression and a snug fit. The primary function is to offer firm protection and controlled mobility for the injured area.
The Design and Function of Aircasts
The physical structure of an Aircast boot features a lightweight, durable semi-rigid outer shell that encases the healing body part to provide support and protection. Within this shell are pneumatic air cells, often referred to as bladders, which are the defining feature of the device. These air cells can be custom-inflated using an integrated system or a separate hand bulb, allowing the internal cushioning to conform precisely to the patient’s anatomy.
The operation of the air cells relies on the principle of pneumatic compression, essentially using air pressure to squeeze the limb gently. When inflated, the air cells provide targeted, dynamic compression that helps reduce swelling, known medically as edema. The adjustable air cells offer a personalized, cushioned fit, which enhances comfort and provides stability as swelling naturally decreases during recovery.
Common Injuries Treated
Aircasts are widely prescribed for a range of lower leg and ankle injuries that require both stability and controlled compression. One of the most frequent applications is in the management of severe ankle sprains, where ligaments are moderately or completely torn. The device provides the necessary immobilization and support to allow the damaged ligaments to heal without excessive strain.
The boot is also used to treat stable fractures of the foot, ankle, and lower leg, including metatarsal stress fractures, and is often utilized for post-operative immobilization following foot or ankle surgery. The Aircast replaces a traditional cast, offering the benefit of being removable for hygiene and allowing for controlled, limited movement as permitted by a healthcare provider. The pneumatic compression is particularly beneficial in these cases because it manages the significant swelling that often follows a fracture or surgical procedure.
Wearing, Adjusting, and Caring for the Device
Properly applying the Aircast begins with seating the heel firmly against the back of the boot, often over a clean cotton cast sock. Once the foot is positioned and the soft liner is wrapped smoothly, the protective front panel is secured, and the external straps are fastened from the bottom to the top until the boot feels snug. This initial strapping secures the limb within the semi-rigid frame before the pneumatic system is engaged.
The critical step is adjusting the air cells, which is done by locating the integrated pump or hand bulb. On many models, a dial or selector directs the air to different chambers, allowing for individual inflation of the air cells, such as those on the inside and outside of the ankle. Pumping the device ten to twelve times or until the cells feel snug, but not painfully tight, provides the therapeutic compression. If too much pressure is applied, a small release button allows the user to deflate the air slightly until the fit is comfortable and does not cause numbness or tingling in the toes.
Maintenance and Safety
To maintain the device, the foam liner can typically be removed for hand washing and should be laid flat to air dry. The rigid outer shell, straps, and protective panel can be wiped clean with a damp cloth. It is important to deflate the air cells completely before removing the boot, as this ensures a proper and consistent fit when the device is reapplied. Users should always consult their healthcare provider if pain increases or the fit seems incorrect, as proper adjustment is necessary to promote optimal healing.