I'm a trauma surgeon so I think I can clear a few things up. It sounds to me like Simms was unstable when he arrived in the hospital because his spleen was actively bleeding. This likelly caused his blood pressure to be low (his symptoms of dehydration were likely symptoms relating to acute blood loss). As one poster suggested, some times splenic injuries can be observed without surgery by admission to a critical care unit with monitoring of vital signs and following serial lab exams to check blood counts. However, if patients are unstable (meaning their blood pressure doesn't improve with transfusions or requires repeat transfusions to stabilize) a surgical exploration becomes necessary to stop the bleeding. There are some surgeons who employ techniques to repair the spleen, but most splenic injuries that require surgery are extensive enough to require a complete splenic removal. The grading of splenic injuries relates to the size and depth of the injury to the spleen but is not the indicator for surgery (the patients condition at the time dictates treatment) but generally speaking, larger lacerations are more likely to continue to bleed.
Once the spleen is removed, the bleeding usually stops (unless there are other associated injuries causing bleeding that need to be addressed) and patients generally become stable very quickly, thus possibly explaining the potentially different reports of his condition. He was very likely in critical condition on arrival and then his condition improved over the course of the evening.
The incision to explore a bleeding is significantly different from a lap appy incision. A emergency splenectomy incision runs from just below the breast bone to at least the level of the umbilicus and below than in most cases. This creates a longer healing process. Most patients require 3-5 day hospital recovery while they wait for their pain toease up to the point where he can switch from IV to oral pain meds and while we wait for a patients GI function to return. The short term overall complication risk is generally small in a healthy young man like Simms and is less than about 5%. The risk of a dangerous complication is generally much less than 1%.
The longest determinant of his recovery will be the healing of his incision. The body has to form a scar to heal the incision in the abdominal wall musculature. That scar reaches its maximal strentgh at 6 weeks. Until theat time he will need to avoid any strenuous activity including weight lifting and strenuous activity that increases the pressure on his abdominal pressure (he can resume aerobic type exercises i.e.-running, treadmill activity, stationary biking in about a week or so). He can begin resuming strenuous activities at about six weeks postop but it will of course take him more time to get ito playing shape. I think 2-3 months, barring setbacks is a good estimate.
His long term outlook and prospects for playing football in the future are excellent. After complete recovery, his ability to play football should not be compromised. Spleens are removed quite commonly after serious blunt trauma and patients do very well. For most patients, the liver takes over the function of the spleen. Even better, some patiens have very samall accesory spleens hidden in the fat of the abdomen that can grow once the big spleen is removed and take over its functions. Extremely rarely (less than 1 in 10,000 splenectomy patients) a complication called overwhelming post splenectomy sepsis (OPSS) can develop and this can be life threatening. Although rare in adults, the risk of OPSS is slightly higher in children so most pediatric surgeons will be more aggressive in trying to preserve the speen.
I hope this clears some things up. Most importantly I admire Simms' strength and my thoughts and prayers go out to him and his family.