Which of the following is NOT a complication associated with prolonged immobility?

In the context of prolonged immobility, increased flexibility is not a complication that arises. Instead, immobility typically leads to decreased flexibility due to the lack of movement and potential shortening of muscle and connective tissue. Muscle atrophy occurs as muscles are not used, leading to a reduction in muscle mass and strength. Deep vein thrombosis (DVT) is a serious condition that can develop due to blood pooling in the veins when movement is limited, increasing the risk of clot formation. Pressure ulcers develop due to prolonged pressure on the skin, often in individuals who are unable to change positions regularly. Thus, the absence of increased flexibility as a complication aligns with the expected outcomes of immobility, distinguishing it clearly from the other conditions that arise from a lack of movement.