Knee A to Z

Innervation is the nerve supply of a structure.

The Insall-Salvati Ratio is the ratio of the length of the patellar tendon to the length of the patella, when measured on an X-ray or MRI with the knees bent to 30 degrees.

The inside-out technique is a method of repairing a torn meniscus where the sutures are introduced from inside the joint and secured on the outside of the capsule.

Instability in the knee is the feeling that you cannot confidently trust the joint, which may feel wobbly or give way suddenly, and the term may also apply to the kneecap which can sublux or dislocate. Page updated July 2024 by Dr Sheila Strover (Clinical Editor)

Insufflation is a technique to distend the space within the knee capsule in order to break down early adhesions and restore range of motion.

The intercondylar notch is the deep space in the knee between the two rounded ends (condyles) of the thighbone (femur). Page updated March 2024 by Dr Sheila Strover (Clinical Editor)

An interference screw is one that is used to hold a ligament graft firmly in the bone by actually running alongside the ligament tissue.

An intermuscular haematoma is bleeding in the tissue planes between muscles.

An internal brace is a construct placed within the joint that supports a torn ligament while it heals after it has been surgically repaired.

Internal fixation is the procedure of repairing bones by fixing them with metal devices, for example a plate and screws.