ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

Knee X-ray - Understanding the signs of Arthritis

Updated on January 18, 2018

Reading an X-ray of an Arthritic Knee

To understand the changes in an arthritic knee, first it helps to be familiar with what a normal knee looks like. Read this article first to increase your understanding of what is "normal".

There are three x-ray views commonly used in the radiological assessment of the knee. This article will discuss the changes visible on each of the different views and provide an example of each.

X-rays give us clear pictures of the bones only. We can however, learn about the health of other structures by observing the relationship between the bone. In this way we can comment on the smooth articular cartilage that covers our joints but is not visible on x ray.

X-ray of Knee Arthritis

The Knee X-ray - Viewed from straight in front

This x-ray clearly shows arthritis in the knee.

Bones appear white on an x ray as they stop the x ray beam. Anything that lets the beam through (air, cartilage, skin) shows up as black.

Our joints are covered with a layer of super-smooth cartilage that allows the joints to move without causing pain. This cartilage does not show up on x-ray so the bones should appear as though they are not touching.

Anywhere that sees the bones closer together than usual implies that the cartilage has been worn down - this is a sign of arthritis. If the bones appear to be touching, it signifies severe arthritis as all of the smooth covering has been worn away.

In this x-ray, the inside of the knee - seen here on the right half of the x ray - has moderate to severe arthritis. The gap is easily seen as a black line on the left side of the knee, but on the right the bones appear to be touching and only a thin line defines the border between the two bones. This would be called Medial Compartment Osteoarthritis.

Other signs of arthritis included joint line sclerosis. This is when the body responds to the damage being caused by laying down extra bone at the joint line.This hard bone appears as a thin extra-white line on the joint margins.

Lateral View Knee Xray

 This is looking at the knee from the side. Here we are looking mainly at the joint between the kneecap and the thigh bone. Again there should be a gap signifying the articular cartilage.

In this x ray you can barely see a space between the patella and the femur. The view gets progressively worse towards the right.

These views make it easy to notice another feature of osteoarthritis. Osteophytes are small bony spurs that form around the joint line when arthritis is present. they can be seen here in both the main knee joint and between the patella and femur. They make the joint appear "messy"

Skyline view x-ray with arthritis

 In this view, looking at the gap between the kneecap and thigh from above, we are looking for a nice even gap.

Again it is easy to see the difference between the left, where the gap is large, and the right, where the bones are nearly touching.

This x-ray shows moderate patellofemoral osteoarthritis. There is a small amount of sclerosis to go with the joint space narrowing but little evidence of osteophytes.

Knowledge is Power

 Understanding some of the basic points about knee arthritis can help you ask the right questions in the limited time your have with your doctor.

The more you understand about this condition, the more in control you will feel when dealing with your osteoarthritis of the knee.

Your  doctor should explain some of these points to you but it never hurts to have a head start.


    0 of 8192 characters used
    Post Comment
    • profile image


      7 years ago

      Justbhad an X-ray on both knees and have to wait 10days for results , why?? I find it really painful to stand from sitting and cannot bend my knees easily, walking is constant pain, I have taken painkillers for about 3 years now , so I hope after this set of X-rays something will be done.

    • profile image

      Zezo Ahmad 

      7 years ago

      My mother has this I feel bad she complains 24/7 I feel really bad what should I do

    • sudhan45 profile image


      10 years ago

      Thanks for sharing the information


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
    ClickscoThis is a data management platform studying reader behavior (Privacy Policy)