The Joint Replacement Podcast – Episode 18
What does the future of hip and knee replacement surgery look like?
In Episode 18 of The Joint Replacement Podcast, I had the opportunity to sit down with Dr. Michael Ast, Insall Chair of the Knee Service and Innovation Officer at Hospital for Special Surgery (HSS) in New York City. Dr. Ast is widely recognized as one of the leading voices in modern joint replacement and orthopedic innovation. Our discussion covered everything from robotic surgery and artificial intelligence to outpatient joint replacement, implant longevity, opioid reduction, and what patients can expect over the next decade.
Meet Dr. Michael Ast
Dr. Ast serves as the Insall Chair of the Knee Service and Innovation Officer at Hospital for Special Surgery, one of the world’s premier orthopedic institutions. His work spans:
- Robotic-assisted joint replacement
- Outpatient arthroplasty
- Implant innovation
- Digital health technologies
- Artificial intelligence in healthcare
- Value-based orthopedic care
His unique combination of clinical expertise and healthcare leadership provides valuable insight into where joint replacement surgery is headed in the coming years.
The Biggest Innovation Isn’t the Surgery—It’s the Recovery
One of Dr. Ast’s most interesting observations was that many of the most meaningful advances in joint replacement are occurring around the surgery rather than during the operation itself.
He highlighted improvements in:
- Modern anesthesia techniques
- Multimodal pain management
- Opioid reduction strategies
- Muscle-sparing surgical approaches
- Enhanced recovery protocols
- Better patient education
These innovations have dramatically improved the patient experience after surgery and reduced many of the fears patients historically associated with joint replacement.
The Quiet Knee Protocol: Why Less Can Sometimes Be More
One of the most discussed topics was the “Quiet Knee Protocol” developed at HSS.
Traditional rehabilitation often emphasized aggressive physical therapy immediately after knee replacement. The Quiet Knee approach takes a different path:
The First 10 Days
- Less than 1,000 steps per day
- No passive range-of-motion exercises
- Ice therapy for at least 30 minutes every waking hour
- Active motion only within comfort limits
Patients then begin formal physical therapy approximately two weeks after surgery. Dr. Ast reported significant reductions in pain without increased rates of stiffness, manipulation under anesthesia, or blood clots.
The concept is simple:
Control swelling first. Motion comes easier when the knee is calm.
Reducing Opioid Use After Joint Replacement
Dr. Ast has become a strong advocate for minimizing opioid use after surgery.
Several strategies used at HSS include:
- Perioperative steroids
- Cryotherapy (ice therapy)
- Anti-inflammatory medications
- Nutritional supplements such as Diosmin
- New non-opioid pain medications
- Enhanced recovery protocols
According to Dr. Ast, many patients now recover with minimal or no opioid use while maintaining excellent pain control.
Robotics: What Patients Get Wrong
One of the most common misconceptions patients have is that the robot performs the surgery.
Dr. Ast explained that robotic systems are simply tools controlled entirely by the surgeon.
The goal of robotic-assisted surgery is not necessarily to improve average outcomes but rather to reduce outliers and improve consistency.
In his words, technology helps ensure every patient receives the best possible execution of the surgical plan.
For younger patients, registry data has demonstrated improved implant survivorship when navigation technologies are used during knee replacement surgery.
How Long Do Hip and Knee Replacements Last?
Patients frequently ask whether their joint replacement will wear out.
Hip Replacement
Dr. Ast noted that modern highly cross-linked polyethylene has demonstrated exceptional durability. Based on current evidence, many contemporary hip replacements may last decades and potentially a lifetime for many patients.
Knee Replacement
The story is similar for knees.
Historical data from early total knee replacements has shown that many patients maintained their original implants for 30 to 40 years or more. Modern implants and surgical techniques have only improved since then.
Artificial Intelligence Is Already Changing Recovery
One fascinating topic was the use of AI-powered patient engagement platforms.
At HSS, patients can communicate with an AI chatbot that answers common postoperative questions such as:
- When can I shower?
- Is my swelling normal?
- What should my incision look like?
- What activities can I do today?
These tools provide reassurance, improve patient engagement, and allow healthcare teams to focus on patients who truly need direct intervention.
Same-Day Joint Replacement Is Becoming the Norm
Twenty years ago, joint replacement patients commonly spent several days in the hospital.
Today, Dr. Ast reports that more than 90% of his patients go home the same day.
Several factors have enabled this shift:
- Better anesthesia
- Improved pain management
- Earlier mobilization
- Reduced blood loss
- Better patient education
- Enhanced recovery pathways
COVID-19 also accelerated patient acceptance of outpatient surgery and reinforced the idea that joint replacement patients are generally healthy individuals rather than critically ill hospital patients.
Strengthen Your Glutes Before Surgery
When asked for one piece of advice every patient should hear before joint replacement, Dr. Ast’s answer was immediate:
Strengthen Your Glutes
Strong gluteal muscles contribute to:
- Improved knee mechanics
- Better balance
- Reduced fall risk
- Easier postoperative recovery
He encourages patients to begin strengthening exercises before surgery and continue them throughout life.
The Future of Revision Surgery
As implant technology continues to improve, Dr. Ast predicts that revision surgery will increasingly focus on complex problems rather than implant wear.
Future innovations include:
- 3D-printed implants
- Custom implants
- Advanced fixation technologies
- Personalized reconstruction strategies
Many revisions that once required creative improvisation can now be addressed with highly customized solutions.
A Message for Future Physician Leaders
One of the most powerful moments of the conversation came when Dr. Ast discussed physician leadership.
He emphasized that healthcare systems perform best when physicians remain actively involved in leadership and decision-making.
His message to young surgeons was clear:
Learn leadership. Learn healthcare operations. Stay involved. The future of patient care depends on it.
Final Thoughts
Dr. Michael Ast provided an exceptional look into where joint replacement surgery is heading over the next decade.
While robotics, artificial intelligence, and implant technology continue to evolve, the central theme remained remarkably simple:
Better recovery, better patient experience, and more personalized care.
For patients considering hip or knee replacement and surgeons interested in the future of arthroplasty, this episode offers valuable insights from one of the field’s most respected innovators.
Listen to the Full Episode
🎙️ The Joint Replacement Podcast – Episode 18
The Future of Joint Replacement: Robotics, AI, Recovery & Innovation with Dr. Michael Ast
Hosted by Matthew Sloan, MD
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