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.
Humerus. 1  The humerus is the bone of the upper arm extending from the shoulder to the elbow. 2  This long bone is essential for movement and support of the arm (upper extremity). 3  The humerus exists on both arms and thus accounts for 2 bones of the human body.adius. 1  The radius is the bone of the forearm or lower arm, extending from the elbow to the wrist. 2  This bone is relatively long and curved, extending parallel to the ulna. 3  Like the humerus, the radius' primary function includes motion of the arm and support of the arm.