T
Tuberculosis
Tuberculosis (TB) is an infection caused by the tuberculosis bacterium and it may affect the knee and cause a destructive arthritis.
U
UKR
UKR is an abbreviation of 'unicompartmental knee replacement'.
Ultrasound
Ultrasound consists of very high frequency sound waves.
Umbilical stem cells
Umbilical stem cells are primitive cells within the blood of the infant's umbilical cord that are capable of differentiating into many different types of cells.
Unhappy triad
The unhappy triad (of O'Donoghue) is the name given to a combination injury of a meniscal tear, medial collateral ligament tear and anterior cruciate ligament tear of the knee. Page updated June 2024 by Dr Sheila Strover (Clinical Editor)
Unicompartmental
Unicompartmental means relating to one of the three compartments of the knee.
Unicompartmental arthritis
Unicompartmental arthritis is joint destruction affecting only the one side of a knee, very often the medial (or inner) side.
Unicompartmental arthroplasty
Unicompartmental arthroplasty is a replacement of the joint in only one of the three knee compartments.
Unicompartmental knee replacement
A unicompartmental knee replacement is a surgical procedure where the surgeon just replaces one part of an arthritic joint.
Unispacer
A unispacer is a small metallic wedge which is sometimes used in knee surgery to correct the deformity of a meniscectomy (removal of the meniscus) and improve the consequent imbalance of forces after meniscectomy.