How has internal fixation changed our thinking about cast disease?
Immobilization is one of the primary tenants of injury management. But prolonged immobilization can result in problems. Cast disease describes the problems associated with immobilization of an injury with rigid casting or prolonged non-weight bearing. Cast disease can be described as a syndrome of symptoms that occur and become increasingly worse with prolonged immobilization. These symptoms include osteoporosis, muscle atrophy, lymphedema and the potential for deep vein thrombosis.
As a resident in 1983, I had the honor to meet one of the founders of the science of internal fixation, Hans Willenegger (image right). Dr. Willenengger, along with several other doctors had formed a study group in Davos, Switzerland called the AO Foundation (Arbeitsgemeinschaft für Osteosynthesefragen). The AO Foundation established the founding principles for internal bone fixation.
I was a young, niave foot and ankle surgeon and Dr. Wilennegger was a seasoned surgeon who trained in war time as a surgeon for the German army in WWII. He kindly and passionately described to me something that I’ll never forget.
“As the Allied forces advanced, our field hospital and our patients were forced to evacuate. Fortunately I had the opportunity to watch these men heal over weeks to months. What struck me was the fact that for those soldiers with orthopedic injuries, when forced to ambulate, they healed much faster than if they were allowed to rest. There was something important in early weight bearing and early return to activity.”
What Dr. Wilennegger described was cast disease – the problems that arise as a result of inactivity and non-weight bearing. Internal fixation, and now external fixation techniques, allowed patients to return to early ambulation. The core pricinples of the AO group stressed early return to weight bearing.
So have we put to rest the problems of cast disease? Is cast disease a thing of the past? Unfortunately not. The point of this post is to honor that fundamental principal of the AO group – early return to weight bearing. I see all too often treatment that is based on just the opposite; place the patient in a cast and see them in 8 weeks. I think that defeats some of the best medical science of the 20th century. Early weight bearing requires a well defined treatment plan. Early weight bearing requires coordination with ancillary services like physical therapy and occupational therapy. And it requires a carefully defined treatment plan with frequent monitoring of patient status. In these days of rapid room turn over, I can’t help but honor the legacy of Dr. Wilennegger and his push to individualize care and push for early ambulation.
Is cast disease a thing of the past? Unfortunately not. But keeping the spirit of Hans Wilennegger alive and well may help. Internal fixation, early ambulation and individualized care – that’s the cure for cast disease.