Just another iHealthSpot WP02 site

Header Right

Osteoarthritis of the Knee

Back to Patient Education

Introduction

Osteoarthritis is the most common type of arthritis, affecting more than 21 million Americans.  Osteoarthritis tends to develop as people get older or from overuse of the knee during work or sports.  Osteoarthritis causes the protective covering at the ends of the bones in the knee to gradually wear away, resulting in painful bone on bone rubbing and disrupted movement.  Medications, physical therapy, and knee injections are used to treat osteoarthritis of the knee.  Surgery may be necessary if pain and immobility limit your activities and lifestyle, despite non-surgical treatments.
Back to top

Anatomy

The knee is one of the most complex joints in the body.  It is composed of three bones.  The thighbone (femur) is positioned on top of the larger leg bone (tibia).  The kneecap (patella) glides in a groove on the end of the thighbone.  Large muscle groups in the thigh give the knee strength and stability. 

A smooth articular cartilage covers the bones in the knee joint.  The articular cartilage serves as a cushion between the joints, allowing the bones to glide pain-free during motion.  When the articular cartilage breaks down, the space between the joint narrows and becomes uneven.
Back to top

Causes

Osteoarthritis of the knee occurs as the articular cartilage in the knee joint breaks down, causing a reaction in the bone.  The bones in the knee joint become thicker and develop growths (osteophytes or spurs). Lubricating fluid in the joint (synovial fluid) gets thicker and inflamed. If too much fluid is produced, a condition referred to as "water on the knee" can result.

With osteoarthritis, the knee joint continues to experience changes over several years.  Eventually, very little of the articular cartilage remains.  Bone-on-bone rubbing causes pain, impairs knee movements, and makes daily activities difficult.

Factors that increase the risk of developing osteoarthritis include:
• Excess weight or obesity that adds pressure to the knee joints
• Heredity
• Increasing age
• Women more than 50 years old have a higher incidence than men
• Knee injury
• Repetitive stress injury to the knee
• Participation in high impact sports
• Certain illnesses, including septic arthritis and metabolic disorders
Back to top

Symptoms

Osteoarthritis of the knee can cause knee pain and swelling.  You may have difficulty moving your knee or performing activities such as walking, squatting, kneeling, and going up or down stairs.
Back to top

Diagnosis

Doctors diagnose osteoarthritis of the knee by examining the knee, considering your symptoms, and reviewing your medical records. X-rays are the main diagnostic tool to diagnose osteoarthritis.
Back to top

Treatment

Treatment of osteoarthritis of the knee is individualized.  The treatment that you receive depends on several factors, including your overall health and the stage of disease.  Osteoarthritis of the knee is treated with physical therapy, lifestyle changes, medications, surgery, or a combination of treatments. 

If you are overweight , your doctor may recommend that you lose weight.  Attaining and maintaining a healthy weight reduces the load on your knees.  Participating in physical therapy can help strengthen the muscle groups around the knee joint.  A knee brace can provide support.

Your doctor may recommend over-the-counter pain medications such as aspirin or nonsteroidal anti-inflammatory drugs.  Your doctor may prescribe stronger prescription pain medications if necessary.  Joint injections, such as corticosteroid injections or viscosupplementation, are used for osteoarthritis pain relief.
Back to top

Surgery

If symptoms persist despite conservative treatments, knee surgery may be necessary.  Osteotomy and joint replacement (arthroplasty) are surgical procedures to treat osteoarthritis of the knee.  Osteotomy is used to remove and reshape bone from the leg to cause a shift in body weight away from the damaged area. Casting, splinting, and physical therapy follow osteotomy.  Recovery from osteotomy varies from 3 to 6 months for some people, and up to a year for others.

Total knee replacement removes the damaged portion of the knee and replaces it with artificial implants.  Knee replacement is the most common type of joint replacement surgery.  It is highly successful for relieving pain and restoring function. Minimally invasive knee replacement surgery uses smaller incisions, and is associated with shorter hospital stays, shorter rehabilitation periods, and a quicker recovery time than traditional total knee replacement.  Your doctor will let you know which knee joint replacement method is best for you.  Overall, most people experience a dramatic reduction of knee pain and the ability to resume functional activities after knee arthroplasty.
Back to top

Copyright ©  - iHealthSpot, Inc. - www.iHealthSpot.com

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 April 13th, 2016. For information on iHealthSpot’s other services including medical website design, visit www.iHealthSpot.com.

Footer

Patient Education

Our award-winning patient education library contains over 200 articles with images, videos, and tons of helpful information about orthopedic conditions and treatments.

Learn more

Patient Reviews

We feel fortunate to have received reflections from our patients. We invite you to leave a review as well as read about the experiences others have had.

Blogs and Social Media

View our Blogs and Social Media

Hip and Knee Surgery

A Patient's Guide to Hip Replacement, Hip Resurfacing, Knee Replacement, and Knee Arthroscopy.

Preview this book and order online on Amazon.

Locations

We have three offices conveniently located throughout western Connecticut:
● Middlebury, CT ● Farmington, CT ● New Milford CT

Copyright © Orthopaedics New England. All rights reserved.

Orthopaedics New England provides orthopedic care to residents of Waterbury, Middlebury, New Milford, Farmington, and surrounding communities in western Connecticut. Our orthopedic surgeons, Dr. John Keggi and Dr. Robert Kennon specialize in hip replacement and resurfacing, knee replacement, revision of failed joint replacements, hip and knee arthroscopy, and adult fracture care.