According to Stephanie Bell on ESPN, the term "bulging disc" sounds worse than it really is:
http://sports.espn.go.com/espn/blog/index?...=bell_stephania
Steven Jackson, Rams: The recent news coming from the Rams' own website that Jackson has a bulging disc in his back has no doubt caused alarm amongst Jackson owners. Not to panic, at least not yet. As we mentioned on Monday, Jackson experienced spasms in his back on Sunday, which is why he left the game early and why the team was looking more closely at his back this week. But there are a few things you should know about discs.
1. Many people have bulging discs and do not have pain. In fact, multiple studies have taken asymptomatic individuals, subjected them to a variety of imaging tests, and have shown that a majority of these people have disc bulges or protrusions or some other abnormality. Yet, somehow, these people do not have pain.
2. Many people experience back pain that is consistent in behavior with disc pain, yet have no positive findings of any kind on imaging.
3. People who have some evidence of disc damage on imaging and also have pain, may ultimately recover completely from the pain, yet repeat imaging can show the exact same damage to be present in the disc.
The takeaway message? It is virtually impossible to definitively correlate the presence of a disc bulge with any particular symptoms. It is worth noting that in the case of a frank herniation with nerve impingement ("pinched nerve"), where the disc has extensive damage and is visibly encroaching on a nerve, the associated symptoms may be more clearly linked to the disc injury. But a bulge, which is a minor deformity of a disc, is often benign.
So blah, blah, blah you say, how does this relate to Steven Jackson? Here's how. It is possible that Jackson has had a disc bulge for some time. It is possible that the back spasms that Jackson experienced could be in response to an aggravated disc. In fact, it's possible that some of those elements could have been present before the groin injury. But the symptoms could also occur for any other number of reasons, including Jackson's own theory of compensating for his groin injury. The bottom line is that Jackson has to feel well enough to perform; the presence or absence of a disc bulge will not, in isolation, dictate his activity. As outlined on the Rams' website, Jackson will take medication and rest this week. Then, just as with any other soft tissue injury, Jackson will gradually work his way back by increasing what he is doing in practice. I would still expect him at this point to be on target for Week 10, barring a setback (which is always a possibility, but not a probability). The primary issue for Jackson at this point is to protect the back symptoms from getting worse, while ensuring that the groin muscle strength and endurance continues to improve. Patience Jackson owners, patience. Don't throw in the towel yet.