The Joint Replacement Podcast | Episode #68 | Kevin Lawson, MD
By Matthew Sloan, MD | Orthopedic Surgeon and Director of Robotics for Orthopedics
Does robotic knee replacement actually produce better outcomes? Is anterior hip replacement really superior to posterior hip replacement? And can a perfectly positioned knee replacement still leave a patient dissatisfied?
These are some of the most important questions facing patients considering hip or knee replacement surgery.
In Episode #68 of The Joint Replacement Podcast, I sit down with Dr. Kevin Lawson, a fellowship-trained hip and knee replacement surgeon practicing at MultiCare Health System in Washington State.
Dr. Lawson completed his adult reconstruction fellowship at Stanford and specializes in primary and revision hip and knee replacement. He brings an interesting perspective to the conversation because he uses ROSA robotic technology for knee replacement, AI-assisted imaging for hip replacement, and performs both anterior and posterior hip replacement surgery.
We discuss where surgical technology provides meaningful benefits, why even technically excellent surgery can sometimes leave patients dissatisfied, and what patients should prioritize when choosing a joint replacement surgeon.
1. When Is It Time for Hip or Knee Replacement?
One of the first questions patients ask is whether their arthritis is severe enough to justify joint replacement.
Dr. Lawson emphasizes a principle I frequently discuss with my own patients:
We don’t treat X-rays. We treat people.
A patient may have advanced arthritis on imaging but remain relatively comfortable and active. Another patient with significant arthritis may struggle with everyday activities, including walking, exercising, traveling, or spending time with family.
The decision to proceed with joint replacement should consider:
- How much pain interferes with everyday life
- Whether arthritis limits activities that matter to the patient
- Whether reasonable nonsurgical treatments have failed
- Whether the patient is medically optimized
- Whether the patient is prepared for surgery and rehabilitation
Dr. Lawson also emphasizes that age alone should not determine whether someone is a candidate.
The key takeaway: Joint replacement is generally an elective, quality-of-life procedure. The right time for surgery depends on the patient’s symptoms, goals, medical readiness, and preferences—not simply their age or X-ray findings.
2. Does Robotic Knee Replacement Actually Improve Outcomes?
Robotic-assisted knee replacement is one of the fastest-evolving areas of orthopedic surgery.
Dr. Lawson uses the ROSA robotic knee replacement platform, while I use the MAKO robotic system.
Although these platforms differ in their planning, registration, and surgical workflows, both are designed to help surgeons execute their surgical plans with greater precision.
Dr. Lawson describes several advantages he has experienced using robotics.
More personalized implant positioning
Rather than relying exclusively on traditional alignment targets, robotic technology allows surgeons to evaluate individual anatomy and ligament balance during surgery.
Dr. Lawson describes using a functional alignment philosophy, adjusting implant positioning to achieve appropriate balance throughout knee motion.
Greater confidence in complex knee replacements
One of the most interesting points from our discussion involves patients with severe deformities.
Dr. Lawson believes the greatest potential benefit of robotics may be in the subset of patients with particularly complex knee anatomy.
In these situations, robotic technology may help surgeons achieve acceptable alignment and ligament balance without necessarily requiring more constrained implants.
Improved surgical efficiency and consistency
Robotic technology has also changed how Dr. Lawson experiences surgery.
He describes greater confidence when performing both straightforward and complex knee replacements, along with reduced intraoperative stress and improved efficiency.
However, he acknowledges an important limitation:
When researchers evaluate broad groups of knee replacement patients, robotic surgery has not consistently demonstrated superior patient-reported outcomes or implant survival compared with conventional surgery.
This distinction matters.
Robotic technology can improve the precision and consistency of certain surgical steps without automatically proving that every patient will have a better outcome.
The challenge for future research is determining which patients benefit most.
3. ROSA vs. MAKO: Which Robotic Knee Replacement System Is Better?
Patients increasingly ask whether one robotic platform is superior to another.
ROSA, developed by Zimmer Biomet, and MAKO, developed by Stryker, represent two different approaches to robotic-assisted knee replacement.
In our conversation, Dr. Lawson explains that surgeons choose technology based on several factors:
- Experience and familiarity with the system
- Implant preferences
- Surgical workflow
- Available hospital technology
- Institutional contracts and financial considerations
- Support from the surgical team and implant representatives
Dr. Lawson chose ROSA in part because of his experience with Zimmer Biomet implants and his preference for maintaining a familiar implant portfolio.
I use MAKO technology in my own hip and knee replacement practice.
Although we use different robotic systems, we share the goal of achieving reproducible surgical execution while individualizing treatment to each patient’s anatomy.
For patients, the more important question may not be which robot your surgeon uses, but how experienced your surgeon is with that technology and how they measure their outcomes.
There is currently insufficient comparative evidence to conclude that either platform consistently produces superior clinical outcomes across all patients.
4. Can a Perfectly Positioned Knee Replacement Still Be Painful?
This was one of the most thought-provoking parts of our conversation.
Imagine a knee replacement with:
- Excellent implant positioning
- Appropriate ligament balance
- Stable motion throughout the knee
- No obvious mechanical complications
- Normal postoperative X-rays
Could that patient still experience pain or dissatisfaction?
Unfortunately, yes.
Dr. Lawson acknowledges that even with modern surgical technology, orthopedic surgeons do not fully understand every factor influencing how a replaced knee feels.
Potential contributors include scar tissue, soft-tissue irritation, abnormal sensations, persistent inflammation, and differences in how individual patients respond to surgery.
He also discusses evidence suggesting that patients with more advanced preoperative arthritis may experience greater improvement than some patients who undergo replacement with less severe disease.
This raises an important question:
Are we becoming better at positioning knee implants without fully understanding what makes a knee feel natural?
Robotics may help surgeons consistently achieve their intended surgical goals, but identifying the ideal surgical target for every patient remains an evolving area of research.
5. Is Anterior Hip Replacement Really Better? There’s No Free Lunch.
One of my favorite discussions from the episode centers on anterior versus posterior hip replacement.
Dr. Lawson has extensive training in both approaches and now performs primarily anterior hip replacements.
He believes anterior hip replacement can provide a faster early recovery.
But his estimate of that advantage may surprise patients.
He suggests that the most meaningful recovery difference may occur during approximately the first two weeks after surgery.
After that, recovery trajectories between approaches can become increasingly similar.
And as Dr. Lawson explains:
“There’s no free lunch.”
Potential advantages of anterior hip replacement
- Faster early functional recovery in some patients
- Less early postoperative pain in some studies
- The ability to use intraoperative fluoroscopy to evaluate implant positioning
- A favorable dislocation profile in some patient populations
Potential disadvantages
- Lateral femoral cutaneous nerve irritation or numbness
- Hip flexor or groin discomfort
- Technical challenges during femoral preparation
- Approach-specific complications
Posterior hip replacement also has advantages and disadvantages, and both approaches can produce excellent long-term outcomes.
The most important message is that surgical approach alone does not determine success.
Surgeon experience, appropriate patient selection, implant positioning, and postoperative care all matter.
Patients should be cautious about claims that any single surgical approach is universally superior.
6. How Is Artificial Intelligence Being Used During Hip Replacement?
Artificial intelligence is beginning to influence how surgeons plan and perform hip replacement surgery.
Dr. Lawson discusses his use of OrthoGrid, an imaging and navigation technology that integrates with intraoperative fluoroscopy.
During anterior hip replacement, fluoroscopy allows the surgeon to assess implant position before completing surgery.
However, traditional X-ray imaging can introduce measurement errors related to imaging angles, magnification, and parallax.
Dr. Lawson explains that OrthoGrid provides additional information to help him evaluate:
- Acetabular cup positioning
- Hip biomechanics
- Leg length
- Femoral offset
These measurements help surgeons assess whether they are achieving the intended reconstruction.
Importantly, AI-assisted imaging does not independently perform the operation. The surgeon remains responsible for interpreting the information and making surgical decisions.
The potential benefit is improved intraoperative information, not replacing surgical judgment.
Whether these technologies consistently improve long-term patient outcomes remains an important research question.
7. What Should Patients Expect During Recovery?
Hip and knee replacement recovery can vary considerably.
Dr. Lawson explains that patients sometimes develop unrealistic expectations after hearing stories about remarkably fast recoveries.
Some patients undergoing anterior hip replacement may walk comfortably with minimal assistance within the first few weeks.
Others require substantially more time.
For knee replacement, recovery often takes longer.
Dr. Lawson estimates that approximately 80% of knee replacement healing occurs during the first six months, although the pace differs substantially between individuals.
Importantly, feeling better at two weeks does not mean that the joint has completely healed.
The importance of controlling swelling
Near the end of our conversation, Dr. Lawson discusses a philosophy that closely aligns with my approach to early knee replacement recovery.
He compares the initial healing period to recovering from a significant ankle sprain.
After an ankle sprain, most people recognize the importance of allowing inflammation to settle rather than immediately pushing through aggressive activity.
Yet after knee replacement, patients are sometimes encouraged to exercise extensively despite substantial postoperative swelling.
Dr. Lawson emphasizes the importance of early swelling control and avoiding excessive activity.
This is closely related to the principles behind my Quiet Knee Protocol, which prioritizes protecting the knee during the first two weeks before progressing rehabilitation.
The broader message is that recovery is not simply about doing more exercise.
Appropriate activity, swelling management, and allowing tissues to heal are all important components of successful rehabilitation.
Patients should follow the individualized rehabilitation instructions provided by their own surgical team.
8. How Should You Choose Your Joint Replacement Surgeon?
Toward the end of our conversation, I asked Dr. Lawson a question I believe every patient should consider:
If you or someone in your family needed a hip or knee replacement tomorrow, how would you choose the surgeon?
His response focused less on a particular robot, implant, or surgical approach and more on the surgeon and the surrounding care team.
He would look for someone with:
- A strong professional reputation
- Significant experience performing joint replacement
- Efficient and consistent surgical technique
- Good communication and bedside manner
- A willingness to address postoperative concerns
- An established joint replacement program
He also notes that other surgeons and experienced operating room personnel can offer useful perspectives on a surgeon’s clinical practice.
An experienced surgeon supported by a coordinated surgical team may provide advantages extending well beyond the operating room.
I would add another important consideration: objective outcomes transparency.
Patients should feel comfortable asking surgeons about complication rates, revision rates, patient-reported outcomes, and how results are measured.
The future of joint replacement should involve not only better technology, but also better transparency about what patients actually experience.
9. What Does the Future of Joint Replacement Look Like?
Over just the past several years, joint replacement surgery has changed dramatically.
Our conversation touches on improvements in:
- Robotic surgical technology
- Multimodal pain management
- Blood conservation strategies
- Same-day joint replacement
- Postoperative dressings
- Surgical efficiency
- Rehabilitation protocols
Dr. Lawson believes the next major opportunity may involve improving patients’ metabolic and nutritional health before surgery.
Rather than focusing exclusively on surgical technique, future improvements may increasingly come from understanding how patients heal.
Could better preoperative nutrition improve recovery?
Could metabolic optimization reduce inflammation?
Could individualized rehabilitation protocols improve patient satisfaction?
These are worthwhile questions for the next generation of joint replacement research.
Technology will continue evolving, but ultimately the goal remains the same: helping patients recover comfortably, return to meaningful activities, and achieve durable improvements in quality of life.
Final Thoughts: Better Technology Doesn’t Automatically Mean Better Outcomes
My biggest takeaway from this conversation with Dr. Kevin Lawson is that modern joint replacement is becoming increasingly personalized.
Robotic surgery offers surgeons new tools to improve precision and consistency.
AI-assisted imaging provides additional information during hip replacement.
Different surgical approaches offer different advantages and tradeoffs.
But the most advanced technology is not necessarily the right solution for every patient.
The most important factors remain thoughtful surgical planning, experienced execution, appropriate patient selection, and a recovery plan tailored to the individual.
And as Dr. Lawson reminds us when discussing anterior hip replacement:
“There’s no free lunch.”
Every surgical decision involves tradeoffs.
The goal is understanding those tradeoffs and making informed decisions supported by the best available evidence.
Watch or Listen to Episode #68
#68 – Is Robotic Joint Replacement Really Better? Kevin Lawson, MD
Join Dr. Matthew Sloan and Dr. Kevin Lawson for a conversation about robotic knee replacement, anterior versus posterior hip replacement, artificial intelligence, recovery,