Satellite Orthopedic Hospital & Research Center Pvt Ltd

Dr. Amir Sanghavi - M.S. (Orthopedics)
Joint replacement Fellow (Australia)
Dr. Ateet Sharma
- M.S. (Orthopedics)
Joint replacement Fellow (Singapore, U.S.A. & Germany)

Home > Medical Services > Knee and hip replacement

Knee and hip replacement

Joint replacement surgery is also known as Arthroplasty.

The surgery is usually needed when an arthritic or damaged joint needs to be removed and replaced with an artificial joint. In knee or hip replacement surgery, the artificial joint is made out of metal and plastic. In the case of joint replacement in the hand, the new joint is most commonly composed of silicone rubber or the patient’s own tissues such as a portion of tendon.
After the surgery, the artificial joints allow joint movement similar to a healthy and natural joint. This provides the patient quick relief from the pain, and more importantly, it helps bring back the normal and dependence-free quality of life for the patient.
Considering the benefits and ease, more and more patients are opting for these surgeries in recent years.

FAQs for Knee joint replacement

1. What is a knee replacement?

In total knee replacement surgery, the parts of the bones that rub together are resurfaced with metal and plastic implants. Using special, precision instruments, your surgeon will typically remove the damaged surfaces of all three bones. The replacement surfaces will then be fixed into place.

The surface of the femur is replaced with a rounded metal component that comes very close to matching the curve of your natural bone. The surface of the tibia is replaced with a smooth plastic component. This flat metal component holds a smooth plastic piece made of ultra-high-molecular-weight polyethylene plastic that serves as the cartilage. The undersurface of the kneecap may also be replaced with an implant made of the same polyethylene plastic.

knee joint

2. How do I prepare for knee replacement surgery?

If you and your surgeon decide that total knee replacement is right for you, a date will be scheduled for your surgery. Several things may be necessary to prepare for surgery. For example, your surgeon might ask you to have a physical examination by an M.D. physician or your regular doctor.

Because blood transfusions are likely to be needed during your surgery, you may want to donate one unit of your own blood or possibly two units if your surgeon feels it is needed. All preparations for surgery should be discussed with your surgeon.

3. How soon can I return to normal activities after surgery?

Within six weeks after surgery, most patients are able to walk without a cane. You will probably feel well enough to drive a car within seven to eight weeks after surgery.

In most cases, successful joint replacement surgery will relieve your pain and stiffness, and allow you to resume many of your normal daily activities. But even after you have fully recovered from your surgery, you will still have some restrictions. Normal daily activities do not include contact sports or activities that put excessive strain on your joints. Although your artificial joint can be replaced, a second implant is seldom as effective as the first.

4. How common is knee replacement surgery?

Knee replacement is a routine surgery performed on over 600,000 people worldwide each year. Over 90% of people who have had Total Knee Replacement experience an improvement in knee pain and function.

5. How old is the average patient?

In the U.S., the average joint replacement patient is around 65-70 years old, however patients of all ages have received knee implants.

6. How long will my artificial Knee joint last?

There are several factors on which longevity of Implants depend. Your Doctor will explain you in detail but approximately it will last for 18-22 years in 96% of patients

FAQs for Hip joint replacement

1. What is a hip replacement?

In a total hip replacement surgery, the painful parts of the damaged hip are replaced with artificial hip parts called prosthesis, a device that substitutes or supplements a joint. The prosthesis consists of steel components: a socket, ball, and stem. The outer shell of the socket is usually made of metal and the inner shell consists of plastic, or the entire socket may be plastic. When the metal ball is joined with the socket, the new hip can allow for smooth, nearly frictionless movement.

hip joint

2. How long does the surgery take? What is the recovery time?

In the weeks immediately following surgery, you may need walking aids such as a cane or crutches. Within a few weeks, however, you should be able to return to normal activities.

3. How is the implant affixed in the body?

  • Bone Cement
  • A special type of bone acrylic cement may be used to secure some or all of the implant components to the bone. If used, the bone cement takes about 15 minute to set.
  • Press-Fit
  • In other cases, the implants may be “press-fit” into the bone. Press-fit components may have a special porous coating that allows tissue to grow up to it for fixation.
  • Combination
  • In some cases, your surgeon may choose a combination of cement and press-fit attachment, depending upon the implant components and condition of the pelvic and thigh bone.

4. How long will a joint replacement last?

Longevity of the prosthetic hip varies from patient to patient. It depends on many factors, such as a patient's physical condition, activity level, and weight, as well as the accuracy of implant placement during surgery. It is useful to keep in mind that prosthetic joints are not as strong or durable as a natural, healthy joint, and there is no guarantee that a prosthetic joint will last the rest of a patient's life.

Today, total hip replacement has become a common and predictable procedure. Many patients enjoy relief from pain and improved function, compared to their status before surgery. As a result, some patients may have unrealistic expectations about what the prosthetic hip can do and how much activity it can withstand. As with any mechanical joint, the ball and socket components move against each other. Natural fluid in the joint space, called synovial fluid, helps to lubricate the implants just as it lubricates the bones and cartilage in a natural joint. Still, the prosthetic components do wear as they roll and slide against each other during movement. As with car tires or brake pads, the rate of wear depends partly on how the hip joint is used. Activities that place a lot of stress on the joint implants, as may be the case with heavier and more active patients, may reduce the service life of the prosthesis. Implant loosening and wear on the plastic portions of the implant can lead to the necessity for revision surgery to replace the worn components, or all of the components. Your doctor will be in the best position to discuss these issues with you, taking into account your particular clinical circumstances, the type of implants used, and your post-surgical lifestyle.

Talk with your doctor about the following points, and how they might affect the longevity and success of your hip replacement:

  • Avoiding repetitive heavy lifting
  • Avoiding excessive stair climbing
  • Maintaining appropriate weight
  • Staying healthy and active
  • Avoiding "impact loading" sports such as jogging, downhill skiing and high impact aerobics
  • Consulting your surgeon before beginning any new sport or activity
  • Thinking before you move
  • Avoiding any physical activities involving quick stop-start motion, twisting or impact stresses
  • Avoiding excessive bending when weight bearing, like climbing steep stairs
  • Not lifting or pushing heavy objects
  • Not kneeling
  • Avoiding low seating surfaces and chairs.

5. What activities can I do or not do after receiving a hip implant?

Typically, patients are advised to avoid high impact sports such as jogging, basketball, racquetball, gymnastics, etc.

Safer activities may include walking, golf, swimming, and bicycling.

Your doctor will advise you on safe activities for your particular condition.

Knee & Hip Replacement
Revision Replacement
Arthroscopy Knee & Shoulder
Complex Trauma

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