Total knee replacement, also called total knee arthroplasty, is a joint reconstruction procedure used to relieve pain and improve function when severe knee damage no longer responds adequately to nonsurgical treatment. During surgery, damaged joint surfaces are removed and replaced with metal and medical-grade polyethylene components. At LA Orthopedics, surgical planning may incorporate advanced technologies and techniques designed to help optimize implant positioning and alignment for the individual patient.
If you have been told you need total knee replacement surgery, you likely deal with pain that limits how you walk, sleep, and move each day. This guide explains how knee arthritis develops, which symptoms may point to surgery, and how total and partial knee replacement differ. It also explains technologies such as robotic-assisted knee replacement that may be used by some surgeons, along with recovery timelines and answers to common patient questions.
Want an expert opinion on what’s happening in your knee? Schedule a consultation with LA Orthopedics to map out the right treatment for you.
Anatomy of Knee Osteoarthritis & Joint Degeneration
The knee is one of the largest and most used joints in the body. Cartilage damage builds slowly in specific parts of the joint, which is why surgeons check each compartment before recommending treatment for severe knee osteoarthritis symptoms.
Three Compartments of the Knee Joint
The knee joint has three separate compartments. These are the medial (inner) compartment, the lateral (outer) compartment, and the patellofemoral compartment behind the kneecap. Each area absorbs weight differently during walking, climbing stairs, and standing up from a chair. The medial compartment commonly experiences greater loading during normal walking and is a frequent site of osteoarthritis. When arthritis affects multiple compartments, a total knee replacement may be considered rather than a partial replacement.
Bone-on-Bone Friction & Subchondral Bone Sclerosis
Healthy knees rely on a smooth layer of cartilage that lets the thigh bone and shin bone glide against each other without pain. As this cartilage wears away, the bone underneath becomes exposed. As cartilage loss becomes advanced, the protective joint space narrows, and areas of the underlying bone may have much less cushioning. X-rays may show severe joint-space narrowing, osteophytes, and subchondral sclerosis associated with advanced osteoarthritis.
Angular Deformities: Bowlegged (Varus) vs. Knock-Kneed (Valgus)
When cartilage wears away unevenly, the leg can shift out of its normal position. A varus deformity, often called bowleggedness, happens when the inner compartment loses more cartilage than the outer side. A valgus deformity, or knock-knee, happens when the outer compartment wears down faster instead. These shifts change how weight travels through the leg. These alignment changes alter how forces travel through the knee and may contribute to uneven loading as arthritis progresses.
Recognizing Symptoms of Severe Knee Degeneration
Not every knee ache points to arthritis, but certain patterns show a joint has reached an advanced stage of wear. Knowing these signs early gives you and your surgeon more time to plan the right treatment.
Severe Weight-Bearing & Rest Pain
One of the clearest signs of advanced arthritis is pain that happens even when the knee is not moving. Many patients describe a deep, constant ache that limits walking to just a few blocks before they need to rest. This pain often continues into the night and makes it hard to sleep. Persistent pain at rest or at night can occur with advanced knee arthritis and is one factor an orthopedic surgeon considers when evaluating whether nonsurgical treatment is still providing adequate relief.
Joint Stiffness & Loss of Range of Motion
Knee osteoarthritis can also cause significant stiffness and loss of range of motion, particularly after periods of inactivity. Patients often struggle to get up from low chairs, climb out of cars, or get out of bed without pushing off with their arms. Over time, many people lose the ability to straighten or fully bend the knee. This affects basic movements like walking on flat ground, and it tends to worsen rather than improve on its own.
Joint Crepitus, Instability & Dependence on Assistive Devices
A grinding or crunching feeling during movement is called crepitus. Crepitus is a grinding, crackling, or crunching sensation that can occur as degenerative changes affect the cartilage and other joint surfaces. Some patients also notice their knee buckling or giving way without warning. This raises the risk of falling. As pain and instability grow, many people start relying on a cane or walker just to get through the day safely. This growing dependence on assistive devices strongly suggests that a surgical evaluation is worth pursuing.
Diagnostic Workflow: How LA Orthopedics Evaluates Joint Health
Before recommending surgery, the team at LA Orthopedics follows a clear diagnostic process to confirm the extent of joint damage. This combines a physical exam with advanced imaging. The goal is to match each patient with the right treatment. That may mean continued care, a partial replacement, or a full reconstruction.
Standing Weight-Bearing Radiographs & Alignment Mapping
Weight-bearing X-rays are commonly used to evaluate joint-space loss, arthritis severity, and alignment. In patients being considered for knee replacement, additional standing or full-length alignment views may be obtained when appropriate. From these images, surgeons measure the leg’s overall alignment and check how much space remains between the bones in each compartment. That measurement tells them whether the wear is confined to one part of the knee or has spread throughout the joint.
How Robotic-Assisted Knee Replacement Planning Works
Some knee replacement surgeons use robotic-assisted systems as part of surgical planning and implantation. Depending on the platform, advanced imaging or intraoperative mapping may be used to create a patient-specific model of the knee and provide additional guidance for component size, position, alignment, bone preparation, and soft-tissue balancing. Robotic assistance is one option in knee replacement surgery. The appropriate surgical approach depends on the patient, the condition of the knee, and the surgeon’s experience and technique.
Surgical Options: Total Knee Replacement vs. Partial Knee Replacement
Choosing between a total and partial knee replacement depends on two things. First, it relies on how much of the joint is damaged. Second, it depends on whether the surrounding ligaments are still healthy. Both procedures aim to relieve pain and restore function. They differ in scope, recovery speed, and long-term durability.
| Parameter | Total Knee Replacement | Partial Knee Replacement |
|---|---|---|
| Anatomical Scope | Resurfaces all three knee compartments | Resurfaces only the affected portion of the knee in appropriately selected patients. |
| Ligament Preservation | Ligament management varies by implant design and surgical technique; collateral ligament balance is important for stability. | Preserves more native bone and ligament structures when those structures are healthy and the patient meets appropriate selection criteria. |
| Ideal Candidate | Multi-compartment severe osteoarthritis or major deformity | Single-compartment arthritis with healthy ligaments |
| Recovery Window | 6 to 12 weeks for functional independence | 4 to 6 weeks |
| Surgical Complexity | Established surgical option for advanced multi-compartment disease. | Technically demanding; reserved for patients who meet strict criteria |
Implant longevity varies by patient age, activity, implant type, surgical factors, and other individual considerations. Both total and partial knee replacements can provide durable results, although revision rates and long-term outcomes differ between procedures and patient populations.
Total Knee Arthroplasty (Multi-Compartment Resurfacing)
Total knee arthroplasty resurfaces the end of the thigh bone and the top of the shin bone. It often resurfaces the back of the kneecap as well. Surgeons remove damaged bone and cartilage. They replace it with durable parts made from metal alloys and polyethylene. This approach is used when arthritis has spread across more than one compartment, or when the joint has a major deformity. Because it treats the entire joint surface, total knee replacement is generally seen as a long-term solution for advanced arthritis.
Partial (Unicompartmental) Knee Replacement
A partial knee replacement treats only the damaged compartment. It leaves healthy bone, cartilage, and ligaments untouched. This procedure works best for patients whose arthritis stays in one area and whose ligaments remain strong. Because it disturbs less tissue, recovery is often faster than with a total knee replacement. Partial replacements are not right for every patient, though, and surgeons apply strict criteria before recommending this option.
Ready to find out which option fits your knee? Schedule a consultation with LA Orthopedics to review your imaging and discuss the right surgical path.
Advanced Surgical Technologies at LA Orthopedics
Knee replacement surgery can be performed using different surgical approaches and technologies. Some surgeons use robotic-assisted systems, while others use established non-robotic techniques based on their training, experience, and surgical planning. Dr. Shahab Mahboubian does not perform robotic-assisted knee replacements at LA Orthopedics. His approach draws on years of experience in adult reconstruction and joint replacement, with surgical planning individualized to the patient’s anatomy, joint damage, and functional goals.
Robotic-Assisted Knee Replacement: An Alternative Technique
Robotic-assisted knee replacement uses computer-guided technology to provide additional information during surgical planning and the procedure. Depending on the system, it may help guide bone preparation, component positioning, alignment, and soft-tissue balancing. The technology assists the surgeon rather than replacing surgical judgment. Although robotic-assisted knee replacement is an available surgical option, Dr. Mahboubian prefers to use traditional systems for knee replacement at LA Orthopedics.
Muscle-Sparing Subvastus & Midvastus Approaches
Different surgical approaches provide access to the knee while handling the quadriceps mechanism in different ways. Subvastus and midvastus approaches may reduce disruption of portions of the extensor mechanism compared with a traditional medial parapatellar approach in selected patients. The appropriate approach depends on anatomy, deformity, surgeon preference, and the requirements of the procedure.
Total Knee Replacement Recovery Timeline & Rehabilitation
This is the general recovery timeline after total knee replacement. Each patient's pace depends on age and activity level. It also depends on how closely they follow their physical therapy plan.
Recovery varies by age, health, preoperative function, surgical technique, complications, and rehabilitation progress. The milestones below are general examples rather than deadlines every patient should expect to meet.
- Day 1 (Immediate Ambulation): Many patients go home the same day or stay one night in the hospital. Walking with a walker usually begins within hours of surgery, guided by a physical therapist.
- Weeks 1 to 2 (Wound Healing & Early Motion): Gentle flexion exercises begin, with a goal of reaching about 90 degrees of bend. Quad activation exercises start, and many patients move from a walker to a cane.
- Weeks 3 to 6 (Gait Normalization & Daily Function): Many patients stop using assistive devices and reach 110 degrees or more of knee bend. Climbing stairs gets easier, and driving may resume once the patient is off pain medication.
- Weeks 6 to 12 (Strength & Endurance Conditioning): Rehab shifts toward building endurance through stationary cycling, leg presses, outdoor walking, and light cardio exercise.
- Months 3 to 6 (Full Daily Restoration): Many patients return to activities such as golf, hiking, swimming, and doubles tennis with little to no pain.
- Months 6 to 12+ (Maximum Maturation & Final Adaptations): Soft tissue keeps healing and any leftover swelling goes away, marking the point of maximum long-term joint function.
Why Choose LA Orthopedics for Total Knee Replacement
The surgeon behind the operation shapes the outcome as much as the operation itself. At LA Orthopedics, that means years of hands-on experience with joint reconstruction, an implant plan built around each patient's own bone structure, and recovery protocols that stay involved from the first consultation through the final follow-up.
Years of Experience in Adult Reconstruction & Joint Replacement
Knee replacement surgery at LA Orthopedics is led by Dr. Shahab Mahboubian, whose years of experience in adult reconstruction and joint replacement inform each stage of surgical planning and recovery. He has worked with patients facing a wide range of knee damage, anatomy, activity levels, and functional goals, using that experience to individualize decisions about implant selection, surgical technique, and rehabilitation. His approach is centered on careful planning and helping patients achieve strong outcomes after joint replacement.
Custom Implant Selection & Biocompatible Materials
Implant choice directly affects how well a new knee performs over time. Knee replacement implants are available in different designs and materials, and implant selection is individualized based on factors such as anatomy, bone quality, age, and surgical needs. These include titanium, cobalt-chrome alloys, and highly cross-linked polyethylene, based on each patient’s bone density and anatomy. Matching the implant to a patient’s own bone structure supports a better fit.
Rapid-Recovery Outpatient Protocols in Los Angeles
Pain control affects how soon a patient can safely leave the hospital and start rehab. LA Orthopedics uses several pain-control methods together, including nerve blocks and local numbing medicine at the surgery site. This lowers the need for strong narcotic drugs. Many patients recover comfortably at home on the same day as surgery, with less risk of the side effects that come with heavy opioid use.
Frequently Asked Questions (FAQ)
How long does total knee replacement surgery take?
Total knee replacement surgery usually takes about 60 to 90 minutes, although surgical time varies by patient and procedure. When preparation, anesthesia, and postoperative recovery are included, patients may spend several hours at the surgical facility.
How long do knee replacement implants last?
Modern knee replacements are designed to provide long-term function, and many remain in place for 15 to 20 years or longer. Longevity varies with age, activity level, body weight, implant factors, and other individual considerations.
Is total knee replacement surgery painful during recovery?
Pain and swelling are expected early in recovery and generally improve as healing progresses. Multimodal pain management, icing, appropriate activity, and rehabilitation are commonly used to support recovery.
When can I walk independently after total knee replacement?
Many patients begin walking with assistance on the day of surgery and gradually transition away from a walker or cane as strength, balance, and confidence improve. The timing varies by patient.
When can I drive after total knee replacement surgery at LA Orthopedics?
Driving may resume when the patient is no longer taking impairing pain medication, can enter and exit the vehicle safely, and has adequate strength, mobility, and reaction time to control the vehicle. Recovery after right-knee replacement may require more time before safe braking is possible. Your surgeon should clear you before you resume driving.
What is the difference between total knee repair and total knee replacement?
“Knee repair” is a broad, non-specific term that may refer to procedures used to treat damaged cartilage, ligaments, meniscus tissue, tendons, or other structures. Total knee replacement, or total knee arthroplasty, specifically replaces the damaged joint surfaces with prosthetic components. The appropriate procedure depends on what is causing the knee problem.
What activities should I avoid after a total knee replacement?
Lower-impact activities such as walking, swimming, cycling, golf, and certain recreational activities are often encouraged after recovery. Higher-impact or pivoting sports may place greater stress on the implant and should be discussed with your surgeon before returning.
What happens if I delay total knee replacement surgery?
Advanced knee arthritis may continue to progress over time, and some patients develop increasing stiffness, weakness, deformity, or limitations in daily activity. However, the decision about when to have knee replacement should be based on symptoms, function, imaging findings, overall health, and response to nonsurgical treatment rather than X-ray appearance alone.
Schedule Your Joint Replacement Evaluation at LA Orthopedics
Knee pain has a way of shrinking a life without anyone noticing. Skipped walks, canceled plans, and sleepless nights spent shifting position don’t feel like much on their own, but together they quietly wear down the life you used to enjoy. The surgeons at LA Orthopedics see this scenario play out often, and Dr. Shahab Mahboubian’s approach starts with figuring out exactly what your knee needs.
That means a closer look at your imaging, an informative conversation about whether total or partial replacement fits your case, and a recovery plan built around your goal, whether that’s getting back to golf, keeping up with grandkids, or simply walking without counting the steps. Schedule your consultation with LA Orthopedics and start that conversation.
CONTACT LA ORTHOPEDICS
LA Orthopedics
Website: https://laorthopedics.com/
Location: Los Angeles, California
This guide gives general medical information and is not formal medical advice. Test results and recovery times vary by patient. Consult a licensed orthopedic surgeon for an exact diagnosis and a treatment plan made for you.