Medial Partial Knee Replacement in Miami: When Only the Inner Compartment Is Worn

What Is Medial Partial Knee Replacement?

The knee has three compartments: medial (inner), lateral (outer), and patellofemoral (under the kneecap). Osteoarthritis often begins in just one. When arthritis is isolated to the medial compartment—the most common pattern—and the other compartments and ligaments remain healthy, a medial partial knee replacement can relieve pain while preserving the rest of the knee.

According to AAOS OrthoInfo, unicompartmental knee arthroplasty replaces only the damaged surfaces with metal and plastic components, leaving intact bone, cartilage, and cruciate ligaments. Because the ACL is preserved, many patients report that a partial knee feels more natural than a total knee replacement.

In my practice, I use robotic-assisted planning and execution for medial UKA. The robotic system helps me map your unique anatomy, plan component size and position, and guide bone preparation with sub-millimeter precision. Every decision—implant choice, alignment, ligament balance—is mine; the robot is a tool that improves accuracy.

Who Is a Candidate for Medial Partial Knee Replacement?

Ideal candidates have:

• Isolated medial-compartment arthritis confirmed on X-ray and exam, with minimal or no arthritis in the lateral or patellofemoral compartments
• Intact cruciate ligaments, especially the ACL
• Stable, correctable alignment—typically a mild varus (bow-legged) deformity that straightens with pressure
• Good range of motion and no inflammatory arthritis

You are generally not a candidate if you have:

• Multi-compartment disease (medial and lateral or patellofemoral arthritis)
• ACL deficiency or significant ligament instability
• Inflammatory arthritis such as rheumatoid arthritis
• Fixed, severe varus deformity that does not correct passively

For patients with disease in more than one compartment, total knee replacement remains the right operation and delivers excellent, durable results. There is no shame in needing a TKA—it is simply a different pattern of arthritis.

It is also important to understand that arthritis is a progressive condition. A medial partial knee addresses the worn compartment today; over time, arthritis may appear in the other compartments. According to data from the Australian and UK registries, many medial UKAs function well for ten to fifteen years or longer, but some patients eventually require conversion to total knee replacement. Your plan is individualized, and we will discuss realistic expectations at your visit.

Recovery and Return to Activity

Most medial UKA patients bear weight immediately with a walker or cane and transition off assistive devices within one to three weeks. Because bone removal is limited and the ligaments are preserved, many people report less postoperative stiffness and a faster return to daily activities compared with total knee replacement.

Physical therapy begins the day of surgery or the next day, focusing on range of motion, quadriceps strength, and gait. In my practice, appropriate candidates are offered same-day discharge at UHealth HSS SoLé Mia and UHealth Tower, supported by a detailed home-recovery protocol and early outpatient therapy.

Typical milestones in healthy candidates:

• 2–4 weeks: Walking without assistive devices, light household tasks
• 6–8 weeks: Driving (when off narcotics and confident with brake response), return to desk work
• 3–4 months: Return to recreational activities—golf, cycling, swimming, hiking

High-impact sports: If you were already golfing, cycling, playing tennis, or hiking before arthritis limited you, the goal of surgery is to send you back to those activities without the pain. I do not impose long-term restrictions on sports you already did. We time your return so that wound healing, strength, and balance are adequate—typically three to four months—but surgery is not a reason to quit an activity you love. Someone who has not played tennis in twenty years is not suddenly a tennis player because of a partial knee; someone who still plays, even with pain, is the patient who goes back.

Risks and How We Address Them

Every surgery carries risk. For medial partial knee replacement, these include:

• Infection: We use preoperative antibiotics, sterile technique, and laminar-flow operating rooms to minimize risk.
• Blood clots: Early mobilization, compression devices, and chemical prophylaxis when indicated reduce clot risk.
• Stiffness or limited motion: Immediate physical therapy and pain control help preserve range of motion.
• Progression of arthritis in other compartments: This is the natural history of the disease, not a complication of the partial replacement. If it occurs, conversion to total knee is straightforward.
• Implant wear or loosening: Modern polyethylene and fixation techniques have improved durability; registries report high survivorship into the second decade for many patients.
• Fracture, nerve injury, or wound issues: Rare, but we monitor closely and intervene early if concerns arise.

Your plan is individualized. We will review your medical history, imaging, and goals to determine whether medial partial knee replacement is right for you.

How I Approach Medial Partial Knee Replacement

In my practice at the University of Miami / UHealth, I offer robotic-assisted medial unicompartmental knee arthroplasty to appropriate candidates. The robotic system allows me to create a personalized preoperative plan based on your CT scan, then execute that plan with real-time feedback during surgery. This precision helps optimize implant position, ligament balance, and alignment.

I perform medial UKA through a limited medial incision, preserving the quadriceps mechanism, cruciate ligaments, and all healthy compartments. For appropriate patients, surgery is performed at UHealth HSS SoLé Mia or UHealth Tower with same-day discharge, supported by a multimodal pain protocol, early physical therapy, and close follow-up.

Clinics are located at UHealth HSS SoLé Mia, UHealth Tower, and UHealth Boca Raton. I am bilingual in English and Spanish.

Frequently Asked Questions

Will I need a total knee replacement later?
Many patients enjoy years of excellent function from a medial partial knee. According to registry data, survivorship at ten years is approximately 90–95 percent in well-selected candidates. If arthritis progresses in other compartments, conversion to total knee is a well-established procedure. Your risk depends on your age, activity level, and the natural progression of arthritis.

How is a partial knee different from a total knee?
A partial knee preserves your ACL, healthy cartilage, and bone. Many patients report that it feels more natural and allows a faster return to activity. A total knee replacement resurfaces all three compartments and is the right choice when arthritis is widespread. Neither is better in absolute terms—each is the right operation for a different pattern of disease.

Can I have robotic-assisted partial knee replacement as an outpatient?
Yes. In my practice, appropriate candidates are offered same-day discharge at UHealth HSS SoLé Mia and UHealth Tower. You will go home the same day with a detailed recovery plan, pain management, and early physical therapy. Not every patient is a candidate for same-day surgery; your plan is individualized based on your health, support at home, and preferences.

Further Reading

• Unicompartmental Knee Replacement – AAOS OrthoInfo
• Partial Knee Replacement – HSS

Schedule a Consultation

If you have medial knee arthritis and want to explore whether partial knee replacement is right for you, call 305-243-3000 to schedule a clinic visit at UHealth HSS SoLé Mia, UHealth Tower, or UHealth Boca Raton, or request an appointment online at miamijointreplacement.com/book.

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Educational information from the practice of Steven Denyer, MD, MS. It is not a diagnosis, treatment plan, or a promise of results. Joint replacement is surgery and carries risks. Suitability, recovery, and implant longevity vary. Discuss your own health, imaging, and goals with a qualified orthopedic surgeon before making a decision.

Educational information only. Individual candidacy, outcomes, and recovery timelines vary and require medical evaluation.