More Common Sense on the Deadlift

"The need for real movements stems from the concept that activation created in a vacuum (e.g., lying prone) is only useable in a vacuum. Segmented practice leads to segmented capacity. Research has already shown that free weights elicit a greater increase in strength (115 percent versus 57 percent for fixed range-of-motion exercise) and balance (245 percent versus 49 percent for fixed range- of-motion exercise), and that they result in lower overall pain levels (1). If it can be shown in the literature that these complex movements are proficient in creating the desired activation patterns, surely these same movements can be accepted as safe, effective and efficient tools."

http://library.crossfit.com/premium/pdf/CFJ_Williams_Backpain.pdf?e=1289611391&h=02f62a6cef956068b185d95fe6c8ef97