When I arrived home, I found mother going up the wall. The fire was out, the baby was crying and Johnny had just cut his knee.

我到家时， 发现母亲烦得几乎发狂。 炉子灭了， 婴儿在哭， 约翰尼正好又摔破膝盖。

《新英汉大辞典》

Tracks crisscrossed it; smooth areas of slope indicated regular use by skateboards and Wall of Death, or at least Wall of Seriously Grazed Knee, cyclists.

自行车车辙纵横交错；光滑的斜坡显然被用来玩滑板或者“死亡之幕”的游戏，而且至少造成了几起“膝盖骨摔伤”和单车特技事故。

youdao

I've bumped my knee on the wall.

我的膝盖撞上了墙壁。

youdao

Judges or panels of judges decide most cases, providing a less sympathetic audience for tales of perhaps self-inflicted heartbreak (like potential knee blowout I risked by running straight into the retaining wall above).

FORBES: Don't Try This At Home: A Swiss Sled Run Would Send U.S. Lawyers Into Ecstasy

Boyle, who returned to the lineup for Game 2 on Saturday following a knee injury, carried the puck from the right-wing wall, cut into the circle, shifted the puck to both sides of his stick, and flipped a shot over a crouched Green and past Holtby at 12:50 for what was technically an even-strength goal.

WSJ: Rangers hold off Caps, cut deficit to 2-1