In effect, the requirement for muscular force is lessened and the potential strength gains are reduced accordingly. Secondly, explosive lifting can also be dangerous. When the forces exceed the structural limits of a joint, an injury occurs in the muscles, bones and connective tissue. Indeed, the potential for injury from power cleans is positively enormous. When performing power cleans, the musculoskeletal system is exposed to repetitive trauma and extreme biomechanical loading.
Young athletes are especially vulnerable.
More importantly, a power clean is inherently dangerous because it is performed explosively. Recall that ballistic movements are also inefficient due to the involvement of momentum. The sport of competitive weightlifting carries a certain degree of risk. Competitive weightlifters accept those risks as being part of the sport. However, athletes who aren't competitive weightlifters shouldn't have to assume such an unreasonable risk of injury.