Alexei Volkov
Knee replacement surgery involves replacing damaged cartilage and bone with a prosthetic joint made of metal and plastic. The plastic spacer recreates the smooth cushion of the cartilage, while the metal components replace the bone. The knee is the largest joint in the body, and the surgery can be performed either as a total or partial knee replacement. In total knee replacement surgery, all three areas of the knee joint are replaced, while in partial knee replacement, only some areas are replaced, usually in younger adults who have experienced an injury. Dr. Stryker has developed a unique technique for first-time knee replacement patients, where he makes an incision over the front of the knee and uses a computer to help align the cutting guides. He then shaves off the end of the thigh bone and the top of the shin bone to replace them with metal caps and a plastic spacer.
| Characteristics | Values |
|---|---|
| Materials used | Metal and plastic |
| Plastic component | Recreates the smooth cushion of cartilage |
| Surgery time | 1-2 hours |
| Anesthesia | General or regional |
| Recovery time | Up to 1 year for full recovery, but gradual resumption of activities is possible |
| Types | Total knee replacement, partial knee replacement |
| Total knee replacement | Surgeon replaces all three areas of the knee joint: inside, outside, and under the kneecap |
| Partial knee replacement | Surgeon replaces only some areas of the knee joint, usually 1-2 compartments |
| Candidates for partial knee replacement | Younger adults who have experienced an injury or trauma |
| Candidates for total knee replacement | Individuals with joint disease, moderate deformity of the knee, severe arthritis pain |
| Age considerations | Younger people may put extra stress on the artificial knee, causing it to wear out earlier |
| Risks | Dislocation, loosening, fracture, nerve damage, abnormal bone growth, implant wear, soft tissue imbalance, bone loss, reaction to particle debris |
| Durability | Over 90% of artificial knee joints last over 15 years |
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What You'll Learn
Knee replacement surgery: removing damaged cartilage and bone
Knee replacement surgery is a procedure to resurface a knee damaged by arthritis, usually osteoarthritis, or a severe knee injury. The knee is the largest joint in the body, made up of the lower end of the thigh bone (femur), the upper end of the shinbone (tibia), and the kneecap (patella). The ends of these three bones are covered with cartilage, which protects the bones and enables smooth movement within the joint.
During knee replacement surgery, the surgeon will remove the damaged cartilage and a small piece of bone. Then, they will insert a combination of metal and plastic to make up for the removed cartilage. The metal caps the ends of the bones, while the plastic recreates the smooth cushion of cartilage. The prosthetic joint is designed to replicate the shape, size, and function of a natural knee joint.
There are two types of knee replacement surgery: total knee replacement and partial knee replacement. In a total knee replacement, the surgeon will replace all three areas of the knee joint: the inside (medial), outside (lateral), and under the kneecap (patellofemoral). In a partial knee replacement, only some areas of the knee joint are replaced, usually when one or two areas are damaged. This type of surgery is more common in younger adults who have experienced an injury or trauma.
The surgery usually takes around an hour or two, and the patient is then moved to a recovery room. The patient's vital signs and pain levels are monitored, and they may be able to go home the same day, although sometimes an overnight stay in the hospital is required. It can take up to a year to fully recover, but patients can gradually resume their usual activities as they heal.
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Inserting a plastic spacer to recreate the cartilage cushion
Knee replacement surgery involves the insertion of a plastic spacer to recreate the smooth cartilage cushion that is damaged or removed. This spacer, along with metal components, acts as an artificial joint or prosthesis, replacing the damaged cartilage and bone. The knee is the body's largest joint, and traditionally, during knee replacement surgery, the damaged cartilage and a small piece of bone are removed through an incision at the front of the knee.
The plastic spacer is a crucial component of the knee replacement procedure, as it recreates the cushioning effect of the cartilage, allowing for smooth movement within the joint. The spacer is designed to replicate the function of the natural cartilage, providing a smooth surface for the bones to articulate. This plastic spacer is often used in conjunction with metal components, which replace the bone structure of the joint.
During a partial knee replacement, the surgeon will insert the plastic spacer and reshape the patella (kneecap) to fit the new prosthetic joint. This procedure typically takes around an hour, and patients can often go home the same day. The knee joint is made up of the lower end of the thigh bone (femur) and the upper end of the shin bone (tibia), with the kneecap (patella) protecting these bones and enabling smooth movement. The plastic spacer is designed to replicate the function of the cartilage that covers the ends of these bones.
The decision to use plastic spacers and metal implants in knee replacement surgery is based on the specific needs of the patient. While metal-on-metal implants are also used, they are not suitable for everyone, and the use of plastic spacers can help recreate the cushioning effect of natural cartilage, providing a smoother and more comfortable joint movement. The bone is shaped to fit the implant, allowing for a natural fusion that enhances the durability of the joint.
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Reshaping the kneecap to fit the new prosthetic joint
Knee replacement surgery involves replacing damaged cartilage and bone with a prosthetic joint made of metal and plastic. The knee is the largest joint in the body, comprising the lower end of the thigh bone (femur), the upper end of the shinbone (tibia), and the kneecap (patella). The ends of these three bones are covered with cartilage, which protects the bones and enables smooth movement within the joint.
During a total knee replacement, the surgeon replaces all three areas of the knee joint: the inside (medial), outside (lateral), and under the kneecap (patellofemoral). In contrast, a partial knee replacement involves replacing only some areas of the knee joint, typically if only one or two areas are damaged.
In most cases, surgeons will resurface the kneecap rather than replace it entirely. This involves removing damaged cartilage from its surface and replacing it with a prosthetic material, usually a strong plastic, that mimics its natural structure. This method preserves the underlying structure of the kneecap, leading to better recovery times and functionality post-surgery. The bone is shaped to fit the implant, allowing the bone and implant to fuse together as the bone grows.
The decision to use cemented or uncemented implants depends on the patient's specific needs and should be made in consultation with the surgeon. Cemented implants have the downside of introducing grit into the knee, which can wear down the plastic component over time. On the other hand, uncemented implants eliminate the need for cement as the bone grows into the implant, resulting in a more durable joint.
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Cemented vs. uncemented implants: pros and cons
Knee replacement surgery involves replacing damaged cartilage and bone with a prosthetic joint made of metal and plastic. The knee is the body's largest joint, and traditional surgery involves making an incision at the front of the knee. However, Dr. Stryker has pioneered a new technique for first-time knee replacement patients, where he makes an incision at the front of the knee but goes underneath the muscle to access the joint.
During knee replacement surgery, the damaged cartilage and a small piece of bone are removed. The surgeon then inserts a combination of metal and plastic components to replace the damaged parts. A plastic spacer is inserted to recreate the smooth cushion of the cartilage. The bone is also reshaped to fit the new prosthetic joint.
Now, let's discuss the pros and cons of cemented vs. uncemented implants:
Cemented implants involve using bone cement to secure the implant in place. The cement acts as an interlocking surface between the implant and the bone, providing strong and secure fixation. While cemented implants were popularised in the 1960s, they have some downsides. The metal strength is limited to the time of surgery and weakens over time. Additionally, the cement can introduce grit into the joint, causing wear on the plastic components. Cemented implants may also be more likely to break or irritate the surrounding soft tissues, leading to inflammation and the possibility of implant loosening. Cemented hip replacements typically involve shorter surgical times due to the immediate fixation provided by bone cement.
On the other hand, uncemented implants do not use cement. Instead, the bone grows into the implant, creating a natural bond. This eliminates the issue of grit affecting the longevity of the implant. Uncemented implants result in a more durable joint once the bone has grown into place. However, this process takes time, and weight-bearing activities are restricted initially. Uncemented implants are also associated with less post-operative pain due to reduced soft tissue trauma. Uncemented hip replacements may offer advantages in terms of bone preservation and longevity for younger patients.
The decision to use cemented or uncemented implants depends on various factors, including the patient's age, bone quality, activity level, and medical history. Both procedures have their advantages and disadvantages, and the choice should be made jointly by the patient and the surgeon.
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Recovery time: what to expect
Recovery time after a knee replacement surgery depends on the type of surgery and other factors. The two types of knee replacement surgery are total knee replacement and partial knee replacement.
Total knee replacement surgery involves replacing all three areas of the knee joint: the inside (medial), outside (lateral), and under the kneecap (patellofemoral). The recovery time for this procedure can take up to a year, but gradual improvements can be expected. Patients are usually able to resume general activities within four to six weeks.
Partial knee replacement surgery, on the other hand, involves replacing only the damaged compartments of the knee joint, typically the medial and lateral compartments. This type of surgery has a shorter recovery period, with most people recovering within six weeks. Patients can start moving and walking with assistance right away.
The decision to use cemented or uncemented implants also impacts recovery. Cemented implants have the downside of introducing grit into the knee, which can wear down the plastic component over time. Uncemented implants, on the other hand, allow the bone to grow into the implant, creating a natural bond. While this process takes time, it results in a more durable knee and avoids the potential issues associated with cement.
Additionally, the age of the patient may influence recovery time. Younger patients may put extra stress on the artificial knee, causing it to wear out earlier. Therefore, it is important to carefully consider the timing of the surgery to maximize its benefits.
Overall, the recovery process after knee replacement surgery can vary, but with proper planning and gradual rehabilitation, patients can expect to regain mobility and improve their quality of life.
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Frequently asked questions
Knee replacement surgery involves replacing damaged cartilage and bone with a prosthetic joint made of metal and plastic.
Knee replacement surgery risks include dislocation, loosening, fracture, nerve damage, abnormal bone growth, and implant wear. The implant may not provide the same feel or performance as a normal healthy joint.
Recovery from knee replacement surgery can take up to a year, but gradual improvements can be made within the first few weeks. Most people do not need help walking after fully recovering.
Most artificial knees have both metal and plastic parts. Surgeons may also use other materials such as ceramic.
Artificial knees can last over 15 years, with some lasting up to 25 years before they need to be replaced.
