What Is Pinging, Detonation and Pre-ignition. The terms valve clatter, pinging, pre-ignition and detonation describe the strange rattle or knock coming from an engine. This occurs on acceleration with the engine under a load. Each term describes a slightly different condition, but the result is usually the same with each, engine damage.
The upper arm bone, the humerus, connects the shoulder to the elbow. Humerus fractures are generally divided into three types of injuries based on the location of the fracture. The top of the arm bone is called the proximal humerus, and the bottom of the bone is called the distal humerus.
The humerus is one of the three long bones of the arm. It joins with the scapula at the shoulder joint and with the other long bones of the arm, the ulna and radius at the elbow joint.The elbow is the hinge joint between the end of the humerus and the ends of the radius and ulna. The humerus cannot be broken easily.t joins with the scapula at the shoulder joint and with the other long bones of the arm, the ulna and radius at the elbow joint. The elbow is the hinge joint between the end of the humerus and the ends of the radius and ulna.