Minimally Invasive Knee Replacement - Knee Arthroplasty
While the symptoms of knee arthritis may be tolerated with some medications and lifestyle adjustments, for many, knee replacement is the only way to reduce pain, restore function, and improve the quality of life. One type of knee replacement surgery is called Minimally Invasive Knee Arthroplasty. Like traditional total knee replacement surgery, it involves removing the damaged portion of the knee and replacing it with artificial implants called prosthetics. However, Minimally Invasive Knee Arthroplasty uses smaller incisions than traditional surgery. This allows individuals to experience less pain, spend less time in the hospital, and have shorter recovery times.
Ligaments connect our knee bones together. Ligaments are strong tissues that provide structure and motion. Large muscle groups in our thigh give the knee strength and stability.
Two cartilage disks, called menisci, are located on the end of the tibia. The cartilage forms a smooth surface and allows our bones to glide easily during motion. The menisci also act as a shock absorber when we walk or run.
A smooth tissue capsule covers the bones in our knee joint. A thin synovial membrane lines the capsule. The synovium secretes a thick liquid called synovial fluid. The synovial fluid acts as a cushion and lubricant between the joints, allowing us to perform smooth and painless motions.
Osteoarthritis is the most common type of arthritis, affecting some 21 million Americans alone. It tends to develop as people grow older. Osteoarthritis can result from overuse of the knee during sports or work. Osteoarthritis causes the articular cartilage covering the end of the bones to gradually wear away, resulting in painful bone on bone rubbing and disrupted movement.
It may be difficult to move or bend your knee. Your knee pain may eventually limit your everyday activities, including walking, stair climbing, and getting in and out of chairs. Medications, rest, and physical therapy may provide relief from the pain of severe knee arthritis.
Your doctor will order X-rays to see the condition of your bones and to identify areas of arthritis. Sometimes the tissues that surround the knee joint or the condition of the bones do not show up on an X-ray. In this case, your doctor may order Magnetic Resonance Imaging (MRI) scans or a bone scan. An MRI is used to obtain more detailed images. A bone scan identifies the location of abnormal growths in a bone, such as arthritis. A bone scan requires that you receive a small harmless injection of a radioactive substance several hours before your test. The substance collects in your bones in areas where the bone is breaking down or repairing itself. X-rays, MRIs, and bone scans are painless.
As your arthritis progresses and becomes more severe, medications, rest, and physical therapy may fail to relieve your symptoms. Pain and immobility may cause you to limit your activities and lifestyle. Knee replacement surgery is recommended when non-surgical treatments do not provide relief of your symptoms, and the minimally invasive knee replacement provides shorter recovery times and less trauma to the body.
Minimally Invasive Knee Arthroplasty is an alternative to traditional total knee replacement surgery for some people. Minimally Invasive Knee Arthroplasty is similar to traditional total knee replacement in that it involves removing your damaged joint and replacing it with an artificial one. The minimally invasive procedure uses a three to six inch incision, which is much smaller than the traditional eight to twelve inch incision. Because of the smaller incision, Minimally Invasive Knee Arthroplasty is associated with a shorter hospital stay, an easier recovery, and a smaller scar.
Minimally Invasive Knee Arthroplasty is usually an inpatient procedure. The most common types of anesthesia for the surgery are general anesthesia or spinal anesthesia. The general anesthesia will put you to sleep for the procedure. The spinal anesthesia will numb your body from the waist down, while you remain awake but sedated. Your doctor will help you decide which anesthesia is best for you.
Your knee will be placed in a bent position for your surgery. Your surgeon will make a small incision on the side of your patella (kneecap). Your patella and thigh muscles will be moved aside to allow your surgeon access to your joint. Your surgeon will remove your damaged bone, cartilage, and connective tissue. Your knee joint will be replaced with an artificial joint.
There are over 150 types of artificial knee joints. Your surgeon will choose the most appropriate one for you, depending on your age, weight, activity level, and overall health. Nearly all of them consist of three components. The new piece for the end of your femur is made of highly polished metal. The tibial component, for the top of your leg, is made of metal and plastic. The patellar part is made of plastic and fits inside of your kneecap. The artificial pieces may be implanted or surgically cemented in place. The artificial joint will allow you to perform most of the pain-free movements that you used to be able to do.
Physical therapy will begin immediately following your surgery. Walking and knee movements are very important to your recovery. Your physical therapist will instruct you to safely strengthen your knee and improve its flexibility. At first, you will need to use a walker or crutches while standing and walking. Your physical therapist will help you with walking and show you how to go up and down stairs. Eventually, your physical therapist will provide you with a home exercise and safety program.
An occupational therapist can show you ways to dress and bathe within the range of your movement restrictions. Your therapists can recommend durable medical equipment for your home, such as a raised toilet seat or a shower chair. The equipment may make it easier for you to take care of yourself as you heal and help to prevent injury.
Your doctor may prescribe blood thinning medication and special support stockings. You should keep your leg elevated and move or pump your foot and ankle. Your doctor may prescribe compression boots and a Continuous Passive Motion (CPM) Machine. Compression boots are inflatable leg coverings that are attached to a machine. They work to gently squeeze your legs to aid blood circulation. A Continuous Passive Motion (CPM) Machine will move your leg in a cycling motion while you are in bed. The CPM Machine is helpful to improve circulation, decrease swelling, and restore movement in your knee.
The success of your surgery will depend, in part; on how well you follow your home care instructions during the first few weeks following surgery. You may need a little help from another person during the first few days at home. If you do not have family members or a friend nearby, talk to your physician about possible alternative arrangements.
You should be able to resume most of your regular activities in three to six weeks after your procedure. Overall, the majority of people experience a dramatic reduction of knee pain and the ability to resume functional activities after Minimally Invasive Knee Arthroplasty.
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This information is intended for educational and informational purposes only. It should not be used in place of an individual consultation or examination or replace the advice of your health care professional and should not be relied upon to determine diagnosis or course of treatment.
The iHealthSpot patient education library was written collaboratively by the iHealthSpot editorial team which includes Senior Medical Authors Dr. Mary Car-Blanchard, OTD/OTR/L and Valerie K. Clark, and the following editorial advisors: Steve Meadows, MD, Ernie F. Soto, DDS, Ronald J. Glatzer, MD, Jonathan Rosenberg, MD, Christopher M. Nolte, MD, David Applebaum, MD, Jonathan M. Tarrash, MD, and Paula Soto, RN/BSN. This content complies with the HONcode standard for trustworthy health information. The library commenced development on September 1, 2005 with the latest update/addition on February 16, 2022. For information on iHealthSpot’s other services including medical website design, visit www.iHealthSpot.com.