New York, NY—May 17, 2018
Could weight loss surgery before knee replacement improve outcomes or even eliminate the need for joint replacement in severely overweight patients? A study by researchers at Hospital for Special Surgery (HSS) aims to answer that question.
Orthopedic surgeons often encourage obese patients considering knee replacement to try to lose weight before the procedure. The study, known as SWIFT (Surgical Weight-Loss to Improve Functional Status Trajectories Following Total Knee Arthroplasty), is enrolling patients at a number of hospitals nationwide, including HSS. The goal is to compare outcomes in individuals who have bariatric surgery versus those who do not have weight loss surgery before joint replacement. Researchers also aim to determine if losing a significant amount of weight could enable patients to hold off on knee replacement or postpone it indefinitely.
"This is the first prospective study of its kind," explained Alexander McLawhorn, MD, an orthopedic surgeon and lead investigator at HSS. "We hypothesize that weight loss resulting from bariatric surgery prior to knee replacement will improve joint replacement outcomes in obese patients with painful arthritis. It will also be interesting to see if weight loss and reduced stress on their joints will result in less pain and improved mobility, which may enable patients to postpone knee replacement surgery."
A previous retrospective study at HSS found that in severely obese patients, bariatric surgery performed prior to a total hip or knee replacement reduced complications while patients were in the hospital and in the first 90 days after joint replacement surgery.
In the current study, researchers will divide enrolled patients into two groups. One group will undergo bariatric surgery prior to knee replacement, and the other group will have knee replacement only. Patients who choose to have weight loss surgery will have the procedure at New York Presbyterian Hospital. All knee replacement surgeries will take place at HSS.
Approximately 9 to 13 months after bariatric surgery, participants in the first group will be evaluated to determine if they still wish to go ahead with knee replacement; if they feel the surgery can be delayed; or if they believe they no longer need it. Those who choose to have a knee replacement will complete nine research visits over the course of 3.5 to 4 years, in addition to the standard of care visits required for bariatric surgery and knee replacement. Research visits will include the completion of questionnaires to measure pain, physical functioning, quality of life and patient satisfaction; vital sign measurements; and physical function assessments, including the ability to walk a quarter of a mile and climb stairs.
Participants in the control group will undergo a total knee replacement without weight loss surgery and will complete six research visits over the course of 2.5 to 3 years, in addition to the standard of care visits required for knee replacement surgery. The research visits for this group will include the same evaluation activities as those in the bariatric surgery group.
The study is open to individuals with knee osteoarthritis up to age 75 with a body mass index ≥ 40 or a BMI >35 with a qualifying co-existing condition such as obstructive sleep apnea or diabetes. Anyone wishing to receive more information on the study is invited to email Ethan Krell: KrellE@hss.edu.
About HSS | Hospital for Special Surgery
HSS is the world’s leading academic medical center focused on musculoskeletal health. At its core is Hospital for Special Surgery, nationally ranked No. 1 in orthopedics (for the eighth consecutive year) and No. 3 in rheumatology by U.S. News & World Report (2017-2018). Founded in 1863, the Hospital has one of the lowest infection rates in the country and was the first in New York State to receive Magnet Recognition for Excellence in Nursing Service from the American Nurses Credentialing Center four consecutive times. An affiliate of Weill Cornell Medical College, HSS has a main campus in New York City and facilities in New Jersey, Connecticut and in the Long Island and Westchester County regions of New York State. In 2017 HSS provided care to 135,000 patients from 80 countries and performed more than 32,000 surgical procedures. In addition to patient care, HSS leads the field in research, innovation and education. The HSS Research Institute comprises 20 laboratories and 300 staff members focused on leading the advancement of musculoskeletal health through prevention of degeneration, tissue repair and tissue regeneration. The HSS Innovation Institute was formed in 2015 to realize the potential of new drugs, therapeutics and devices; the global standard total knee replacement was developed at HSS in 1969, and in 2017 HSS made 130 invention submissions (more than 2x the submissions in 2015). The HSS Education Institute provides continuing medical curriculum to more than 22,000 subscribing musculoskeletal healthcare professionals in 125 countries. Through HSS Global, the institution is collaborating with medical centers worldwide to advance the quality and value of care and to make world-class HSS care more accessible to more people.