PARTIAL KNEE REPLACEMENT

Alexander P. Sah

Partial knee replacement is similar to total knee replacement in that it is a resurfacing procedure. However, partial knee replacement refers to resurfacing only one of the compartments of the knee. The inside, the outside, or the kneecap area can be treated independently of the others. This option is appropriate for patients who have pain and arthritis isolated to a single portion of the knee.

I have extensive training in partial knee replacement since residency and fellowship. I was fortunate to train with Dr. Richard Scott in Boston and Dr. Richard Berger in Chicago who have some the nation’s greatest expertise in partial knee replacement. I have subsequently published papers on the topic, and continue to teach other surgeons the technique, as well as lecture at meetings on the outcomes.

Side view of partial knee model
Side view of partial knee model
Partial Knee Components
Partial Knee Components
Front View of partial knee model
Front View of partial knee model

Patients must be promptly identified with isolated or early arthritis to benefit most from the procedure. While total knee replacement is also a reliable option in these situations, partial knee replacement has the following potential benefits:

  • bone preservation
  • all ligaments spared
  • less blood loss
  • less invasive surgery
  • better knee range of motion
  • faster recovery
  • a more normal feeling knee

With enhanced pain management protocols, this procedure is routinely performed on an outpatient, home same day, basis for my patients.

Partial Knee Xray
Partial Knee Xray
Partial and Total Knee Implant
Partial and Total Knee Implant
Total Knee Xray
Total Knee Replacement on x-ray

Studies have shown that partial knee replacement can be durable up to 15 years and beyond in the correctly chosen patient. In addition, if arthritis develops elsewhere in the knee, a partial knee replacement can be converted to a primary, or first-time, total knee replacement.

In 2016, I performed the most Zimmer Unicompartmental fixed bearing partial knee replacements in California, the thirteenth most in the United States. In addition, I performed the 5th most partial patellofemoral (kneecap) partial knee replacements in the United States.*  I often serve as faculty to teach other surgeons how to perform partial knee replacement.  I am the United States Lead Investigator of the new Persona Partial Knee System and participate in clinical research in partial knee replacement.

*based on industry database 2016

Less invasive partial knee replacement surgery

Partial Knee Presentations
 
Alexander Sah, Persona Partial Knee Surgical Training Course
Faculty, Las Vegas, 2017
 
Alexander Sah, “The Evolution of Unis- from outcast to outpatient”
Presentation at Contemporary Solutions in Joint Surgery, Salt Lake City, 2017
 
Alexander Sah, “Evolution of Partial knee replacement”
Presentation at Zimmer Biomet Sales Meeting, Indianapolis, 2017
 
Alexander Sah, “Historical Evolution of Partial Knee Replacements”
Presentation at West Regional Recon Hip and Knee Meeting, San Francisco, 2016
 
Alexander Sah, “Patellofemoral Arthroplasty with a Milling System Technique- Early results, minimum 2 year followup”
Presentation at ICJR 3rd Annual Pan Pacific Orthopedic Congress, Kona, Hawaii, 2016
 
Alexander Sah, “Extramedullary Technique for Unicompartmental Knee Arthroplasty- Early results, minimum 2 year followup”
Presentation at ICJR 3rd Annual Pan Pacific Orthopedic Congress, Kona, Hawaii, 2016
 
Alexander Sah, “Unicompartmental Knee Replacement- History and Evolving Indications”
Presentation at Contemporary Solutions in Joint Surgery, Newport Beach, 2016
 
Alexander Sah, “Partial knee replacement- Tips and Technique”
Presentation at Contemporary Solutions in Joint Surgery, Newport Beach, 2016
 
Alexander Sah, “Partial Knee Replacement- advances in surgical techniques & same day discharge”
Presentation at PhysicalTherapy.com, webinar, 2016
 
Alexander Sah, “Results of unicompartmental knee arthroplasty with an extramedullary technique”
Poster at Orthopedics Today Meeting, Hawaii, 2015
 
Alexander Sah, “Early results of patellofemoral arthroplasty with a milling system”
Poster at Orthopedics Today Meeting, Hawaii, 2015
Alexander Sah, “Unicompartmental Knee Arthroplasty”
 
Presentation at California Orthopedic Association Meeting, Laguna Niguel, 2011
Sebastien Parrette, Alexander Sah, Richard Scott, Jean-Noel Argenson, “Unicompartmental knee arthroplasty for Spontaneous Osteonecrosis- a Multicentric Study”
Presentation by Dr. Parrette at AAOS Annual Meeting, San Francisco, 2008
 
Alexander Sah, Richard Scott, “Lateral UKA through a medial approach”
Presentation at AAOS Annual Meeting, San Diego, 2007
 
Alexander Sah, Bryan Springer, Richard Scott, “Survival of the Prosthesis beyond the Patient- UKA in Octogenarians”
Presentation at OREF New England Resident Research Symposium, 2006, Mass General Hospital
 
Alexander Sah, Bryan Springer, Richard Scott, “Unicompartmental Knee Arthroplasty in the Octogenarian”
Poster at AAOS Annual Meeting, Chicago, 2006

Partial Knee Publications

 Riff AJ, Sah AP, Della Valle C. Outcomes and Complications of Unicondylar Arthroplasty. Clinics Sports Medicine, 2014;33(1):149-60.

Sah AP, Scott RD. Lateral unicompartmental knee arthroplasty via a medial approach- Surgical Technique. J Bone Joint Surg. 2008;90S:195-205.

Sah AP, Scott RD. Lateral unicompartmental knee arthroplasty via a medial approach- Study with an average 5-year follow-up. J Bone Joint Surg. 2007; 89:1948-54.

Sah AP, Springer BD, Scott RD. Unicompartmental Knee Arthroplasty in Octogenarians- Survival Beyond the Patient. Clin Orthop Rel Res. 2006;451:107-12.

Springer BD, Scott RD, Sah AP, Carrington R. McKeever Hemiarthroplasty of the Knee in Patients Less Than Sixty Years- Old. J Bone Joint Surg. 2006;88:366-71.

Partial Knee Ongoing Research

Lead investigator of United States, Zimmer partial knee evaluation, 2016-present

Principal Investigator, Zimmer Persona Partial Knee Surgeon Evaluator, 2017-


X

Right Click

No right click