Jay Jaffe has a good post on Jorge Posada and concussions over at PB:
Sadly, concussions have become a Very Big Deal in professional sports in recent years as their devastating and harrowing long-term effects have come to light. Among football players, they’ve been implicated in the onset of dementia. On the diamond, they’re thought to be the real cause of what’s previously been accepted as amyotrophic lateral sclerosis, a/k/a Lou Gehrig’s Disease, at least according to one recent scientific paper. Concussions have ended the careers of players such as Brewers’ third baseman Corey Koskie, who collided with a wall while attempting to catch a pop-up in 2006, and Giants’ catcher Mike Matheny, who was forced into retirement in early 2007 as a result of the cumulative effect of all the foul tips he took in the mask — a situation that rings a bell both literally and figuratively as far as Posada is concerned.
Other players such as Jim Edmonds, Ryan Church, Justin Morneau and Jason Bay have been forced to the sidelines for extended and maddeningly indefinite periods of time due to concussions and their aftermath, the poorly understood post-concussion syndrome, which can include headaches, nausea, dizziness, fatigue, loss of memory, insomnia… a potpourri of misery. Cardinals’ manager Tony La Russa basically impugned Edmonds’ manhood while the latter recuperated, and Mets manager Jerry Manuel similarly made a hash of Church’s situation to the extent that his club came under well-deserved fire for their general handling of such cases.