A "sprained knee" is when the ligaments, which are like tiny bands that hold your knee bones together, get stretched or torn because of an injury. Full definition
The former Chelsea defender sprained a knee against Serbia while on international duty for Portugal, and while he will miss the visit of Christophe Galtier's side, L'Equipe do not believe he is set for a long spell on the sidelines. (caughtoffside.com)
The Portugal centre - back will miss Friday evening's clash against AS Saint - Etienne after spraining his knee in action for the Seleccao against Serbia last week. (caughtoffside.com)
[64] Production was temporarily halted first by an injury to Craig, who sprained his knee whilst shooting a fight scene, [65] and later by an accident involving a filming vehicle that saw three crew members injured, at least one of them seriously. (en.wikipedia.org)