The VA is buying a specific prosthetic limb, not a general category

The US Department of Veterans Affairs awarded a contract for a specific type of prosthetic limb. This means a particular model of a left-side prosthetic leg will be supplied.

Government procurement documents often list general categories of items. This contract specifies a particular model and side of a prosthetic limb. This level of detail can indicate that the VA has standardized on a specific product for a particular need, or that a specific patient's needs are being met. It moves beyond a generic 'prosthetics' category to a concrete product.