Joint Mice

Joint MiceDo you suffer from joint mice knee pain? If you do there is one thing you never have to worry about. There are no mice running around in your knee. Joint Mice is a term for a free body in the synovial space in the knee. Joint mice are composed of fibrous tissue covered by cartilage.

Simply put, Joint mice is a light hearted term referring to the pesky feeling of a loose piece of bone that has fallen off in the knee.

Note – Joint mice is also known as joint mouse, joint body or loose body. This term can refer to objects found in other joints of the body. However, this site is specific to knee pain relief.


Here are the most common joint mice causes:


There are many symptoms for joint mice. These four are the most common ones related to knee pain:


For small loose bodies, a doctor might relieve the symptoms directly. For example, if you feel pain and swelling, anti-inflammatory medications (NSAIDs) may be prescribed. However, in most cases, any loose body that is causing symptoms should be removed.

For large loose bodies, a doctor may recommend arthroscopic surgery. This type of surgery is a minimally invasive procedure in which an examination and possible treatment of damage is performed using an arthroscope.

Rest is mandatory for bone healing and knee pain relief. However, it is always recommended to contact your medical healthcare professional if you feel something moving about in your knee. In addition, if you are experiencing severe knee pain and swelling call your doctor immediately.

Have you had joint mice knee pain? If so please comment below.

Article last updated on January 7th, 2019, first published on March 30, 2013.

Read more about:

Read next:

Knee Pain When Squatting If you are experiencing knee pain when squatting then you might need to learn the proper squat form. Squatting is an innate behavior that starts from ...
Knee Pain at Night Knee pain at night is usually associated with many knee injuries and joint conditions. But some conditions are characterized mainly by knee pain that ...
Knee Bursitis Bursa refers to a small sac which is present in our joints and other parts of the body. They are filled with synovial fluid; this fluid ensures that a...
Chondromalacia Patella Chondromalacia patella is another term for runner's knee or medial knee pain. Today it is more commonly called patellofemoral pain syndrome (PFPS). It...
Pain Behind the Knees – Baker’s Cyst Pain behind the knees comes from several causes. A Baker's Cyst is one of those causes. Aside from the annoying pain, there usually aren't major issue...

Get answers from doctors immediately

Have questions about knee pain? Connect with experienced and board-certified doctors online or by phone. Specialists are available 24/7 and will provide you with immediate answers.

Ask a doctor now

2 thoughts on “Joint Mice

  1. Hi, I think I might have this. I had a torn Meniscus, and I have arthritis. I had surgery a few months ago but now it feels as though a chunk is floating because it floats from side to side or even under the bottom of my knee. It’s very painful when that happens, I can’t bear weight. I move my knee around some and it will go away. Does this sound correct? Will it go away on its own or should I talk to my surgeon again?

Leave a Reply

Your email address will not be published. Required fields are marked *