Knee Replacement Surgery
Restoring Stability, Alignment, and Confidence
Dr. Petty offers both partial and total knee replacement for patients with advanced arthritis, selecting the approach that best preserves natural knee function while delivering exceptional longevity.
Robot-Assisted Partial Knee Replacement
When appropriate, Dr. Petty utilizes partial knee replacement because, in well-selected candidates, it often results in higher patient satisfaction compared with total knee replacement.
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When arthritis is confined to one compartment of the knee (most commonly the medial side), partial knee replacement can offer:
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More natural knee function and feel
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Faster recovery and fewer overnight hospital stays
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High patient satisfaction (with studies showing 90%+ “satisfied or very satisfied” in matched cohorts)
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Preservation of healthy bone, cartilage, and ligaments (including the ACL)
Dr. Petty has implanted partial knees for over 25 years, with less than 1% requiring conversion to total knee replacements. This long-term success reflects meticulous candidate selection, precise surgical technique, high-quality implants, and the use of robotic assistance.
Unmatched Precision with Mako Robotic-Arm Assisted Technology
Dr. Petty uses the Mako Robotic-Arm Assisted Surgery System for partial knee replacements, which creates a personalized 3D surgical plan from your CT scan.
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This technology enhances implant positioning accuracy, optimizes soft-tissue balance and consistency, and improves overall outcomes, often resulting in reduced early pain and quicker return to activity.
Ideal Candidates for Partial Knee Replacement
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Knee x-rays showing arthritis on one side of the knee (usually the medial compartment) with a relatively normal opposite compartment
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Minimal patellofemoral (kneecap) arthritis
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Pain that focuses just on the arthritic side of the knee. Dr. Petty uses the “One Finger Test.” He asks the patient to point with one finger to the spot where the knee hurts most. Ideal candidates point directly to the arthritic area seen on X-ray and report little to no pain elsewhere in the knee.
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Good range of motion, minimal discomfort with patellar grind test, limited varus (bow-legged) or valgus (knock-kneed) deformity, and an intact Anterior Cruciate Ligament (ACL)
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Patients with substantial osteoporosis are not good candidates for partial knees
For patients with more widespread arthritis, total knee replacement remains a highly effective and transformative option.
Total Knee Replacement – Life-Changing Relief
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Knee x-rays showing arthritis on one side of the knee (usually the medial compartment) with a relatively normal opposite compartment
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Minimal patellofemoral (kneecap) arthritis
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Pain that focuses just on the arthritic side of the knee. Dr. Petty uses the “One Finger Test.” He asks the patient to point with one finger to the spot where the knee hurts most. Ideal candidates point directly to the arthritic area seen on X-ray and report little to no pain elsewhere in the knee.
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Good range of motion, minimal discomfort with patellar grind test, limited varus (bow-legged) or valgus (knock-kneed) deformity, and an intact Anterior Cruciate Ligament (ACL)
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Patients with substantial osteoporosis are not good candidates for partial knees
For patients with more widespread arthritis, total knee replacement remains a highly effective and transformative option.
Tailored Implant Options
Dr. Petty selects implants based on patient anatomy and performance demands.
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Options include:
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Zimmer Persona Knee System (with custom cutting blocks and I-Assist computer navigation for optimal fit​​
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Conformis fully customized knee implants
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Mako robot-assisted total knee with Stryker components
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Smith & Nephew Journey II for enhanced motion
A Commitment to Excellence
Across all joint replacement procedures, Dr. Petty’s philosophy remains consistent:
Use High-quality Implants
Employ Precise, Reproducible Surgical Techniques
Minimize Complications
Maximize Durability and Patient Satisfaction
His mission is simple: restore movement, preserve performance, and deliver results that last.