I'm just a bit curious on how you came up with the conclusion that core stability/strength is a waste of time, and were it is repeatedly "shown".
And I know for a fact from my wife doing core stability/strength training with a physio (on recommendation from a neurosurgeon) that it is better for functional ability and treating lower back pain. (she has less pain after the sessions)
by the way, my wife needs disc replacement surgery of the L4/5 S1 disc.
so its safe to say its NOT a waste of time...
Well I certainly don't doubt the fact that your wife is doing core stability, but that does not mean its safe to say it is worth her time at all over other forms of training and rehab.
Core stability training more often than not will focus on co contraction of the trunk musculature, this creates greater intervebral disc pressure, for many people this does not help symptoms. Secondly medically she would get a reduction in symptoms regardless of seeing a physio, as the body is quite amazing at healing it's self.
Thirdly, peer reviewed scientific evidence, not my opinion, but evidence from some fairly reputable researchers is showing that is not a particularly efficacious approach and actually may be detrimental.
Maybe you should ask your wife's physio for their evidence and rationale, I think you might find it lacking, the average physio has a bachelors degree, they aren't exactly trained to understand something as complex as the vertebral column (very few people are) or have the ability to disseminate complex medical research. All the best for her surgery, L5/S1 replacements can be nasty.
The myth of core stability.
http://www.ncbi.nlm.nih.gov/pubmed/?term=the+myth+of+core+stability
Despite a decade of extensive research in this area, it is difficult to see what contribution CS had to the understanding and care of patients suffering from back pain
Systematic review of core muscle activity during physical fitness exercises
http://www.ncbi.nlm.nih.gov/pubmed/23542879
The available evidence suggests that strength and conditioning specialists should focus on implementing multijoint free weight exercises, rather than core-specific exercises, to adequately train the core muscles in their athletes and clients.
A meta-analysis of core stability exercise versus general exercise for chronic low back pain.
http://www.ncbi.nlm.nih.gov/pubmed/23284879
Compared to general exercise, core stability exercise is more effective in decreasing pain and may improve physical function in patients with chronic LBP in the short term.
However, no significant long-term differences in pain severity were observed between patients who engaged in core stability exercise versus those who engaged in general exercise.
Core stability exercises in individuals with and without chronic nonspecific low back pain.
http://www.ncbi.nlm.nih.gov/pubmed/22080309
The widespread use of abdominal bracing in clinical practice, whether it be for patients with LBP or healthy individuals, may not be justified unless symptoms of spinal instability are identified.
Acute effect of labile surfaces during core stability exercises in people with and without low back pain.
http://www.ncbi.nlm.nih.gov/pubmed/20801670
Individuals with LBP exhibited adaptive trunk muscle activity levels while maintaining similar levels of balance and lumbar movement to healthy controls.
Since research suggests no one mode of exercise is more beneficial in LBP rehabilitation, the practicality and safety of labile surfaces for LBP exercise rehabilitation must be questioned from this study.
If you'd like a read of my personal and educated opinion... it's more performance orientated than clinical.
http://www.rotorburn.com/forums/showthread.php?246702-Core-Stability-a-neuroscience-approach
Don't supposed you have a few papers you could point my way? I'd like to show this to my physio.
Show them the meta analysis and the systematic review, they tally up to just over 200 studies included, with many discarded due to lack of quality. The results are of these are reasonably robust.