Another cause of pediatric injury is  child abuse such as shaken baby syndrome. For children, the most common cause of SCI (56%) is vehicle crashes. High numbers of adolescent injuries are attributable in a large part to traffic accidents and sports injuries. For people over 65, falls are the most common cause of traumatic SCI. The elderly and people with severe arthritis are at high risk for SCI because of defects in the spinal column. In nontraumatic SCI, the gender difference is smaller, the average age of occurrence is greater, and incomplete lesions are more common. History
SCI has been known to be devastating for millennia; the ancient Egyptian Edwin Smith Papyrus from 2500 BC, the first known description of the injury, says it is "not to be treated". Hindu texts dating back to 1800 BC also mention SCI and describe traction techniques to straighten the spine. The  Greek physician Hippocrates, born in the fifth century BC, described SCI in his Hippocratic Corpus and invented traction devices to straighten dislocated vertebrae. But it was not until Aulus Cornelius Celsus, born 30 BC, noted that a cervical injury resulted in rapid death that the spinal cord itself was implicated in the condition. In the second century AD the Greek physician Galen experimented on monkeys and reported that a horizontal cut through the spinal cord caused them to lose all sensation and motion below the level of the cut.
Monorchism (also monorchidism) is the state of having only one testicle within the scrotum. Terminology
An individual having monorchism can be referred to as monorchid. Causes
This can be due to:

One testicle not descending into the scrotum during normal embryonic or fetal development (3–4% of normal live births), also known as undescended testis or cryptorchidism. In this case the testis is within the abdominal cavity, somewhere along the normal route of descent – most commonly, within the inguinal canal. Such a testis has an increased risk of malignancy. One testicle may disappear during development (the so-called vanishing testis) due to some intrauterine insult. This is thought to be most likely vascular, such as testicular torsion. One testicle may have been surgically removed through orchiectomy. One testicle may be injured. Notable cases
Due to testicular cancer
Lance Armstrong, American bicyclist. Ashley Gray, Ironman triathlete
Frank Church, late U.S. Senator and a presidential aspirant in 1976. His monorchism was revealed publicly during the 1976 presidential campaign. Tom Green, Canadian comedian-actor. Richard Herring, English comedian and writer
John Kruk, former baseball player
Mark Latham, former Australian politician. Geoff Horsfield, English footballer. Nenê, Brazilian basketball player. Kevin Curtis, American football player. Nigel Farage, former leader of the UK Independence Party. Bobby Moore, English footballer and World Cup winner. Jimmy White, English snooker player. Due to injury
Archibald Douglas, 4th Earl of Douglas, magnate of the Kingdom of Scotland, and Peer of France. Lost in 1403, while fighting at the Battle of Shrewsbury (The previous year he had lost an eye at the Battle of Homildon Hill).