Essential knee terminology
J sign search for term

Lateral subluxation of the patella each time the patella goes into terminal extension.

Joint search for term

A joint is a junction between two bones.

Joint cartilage search for term

Joint cartilage is the shiny white gristle covering the contact surfaces of the bones in articulating (moving) joints.

Joint reconstruction search for term

Replacing damaged joint surfaces with biological structures rather than metal and plastic.

Joint replacement search for term

Joint replacement is removing damaged joint cartilage and underlying bone and replacing it with metal and plastic.

Joint space narrowing search for term

Joint space narrowing is when the bones of femur and tibia are closer together than normal, recognised on an X-ray taken from the front.

JRA search for term

Abbreviation of 'juvenile rheumatoid arthritis'.

Jumper's knee search for term

An overuse condition, also called patellar tendinitis or tendinosis, where the area of attachment of the patellar tendon to the patella becomes painful.

Juvenile rheumatoid arthritis search for term

Juvenile rheumatoid arthritis is arthritis affecting a child (under 16) in several joints where evidence exists that the condition is autoimmune - ie the child's own immune system is attacking its joints.

Juvenile traction osteochondritis search for term

An overuse syndrome where jumping activities in a young person causes excessive pulling of the patellar tendon on the tibial tubercle. Same as Osgood Schlatter's disorder.