| Колени Пети были в ссадинах. | Petya's knees were scratched up. |
| Колени его дрожали. | His knees shook. |
NB When the word колено functions as a subject and does not have a descriptive modifier, the construction колено у + Genitive is often preferred to (a) and (b), above: | |
| Колени у него дрожали. | His knees shook. |
| левое/правое колено | the left/right knee |
| Левое колено у него было в ссадинах. | His left knee was scratched up. |
| то колено, которое было мне видно | the knee I could see |
| колено левой ноги | the knee on the left leg |
| колено на левой ноге | the knee on the left leg |