A contusion is a crushing injury to the tissues, such as a bruise.
Bone contusion progression from traumatic knee injury: association of rate of contusion resolution with injury severity. Pedersen DR, El-Khoury GY, Thedens DR, Saad-Eldine M, Phisitkul P and Amendola A. Open Access J Sports Med. 2017; 8: 9–15.
Traumatic Bone Bruises in the Athlete’s Knee. DeAngelis JP and Spindler KP. Sports Health. 2010 Sep; 2(5): 398–402.