Loose cartilage or meniscus can create this condition. Finally, tightness in the tendons of the quads and hamstrings as they attach around the knee joint. G. Hitting through the ball hurts. This could be rib subluxation in the sternum. It could be a pulled pectoral muscle.
Subdeltoid bursitis can also create pain when contacting and hitting through a ball.
See the shoulder section for more on these issues. I can't military press without acute pain. I can't military press without acute pain. Bursitis in the Acromial joint can create severe swelling and pain when pushing upwards against weight in either bench or military press routines. You should lower the weight, rest the joint, and ice.