Friends,
I believe that this is a classic case of "science" (read "secularism") messing with Scripture. The scientific explanation for the wrist theory is that if the nails had been driven through His hands, they wouldn't have supported His weight. However, the common method for hanging victims on the cross was to tie them. Hanging on the cross was intended to be a slow, painful death by (believe it or not) drowning. It is likely that Christ also was tied, so the position of the nails is immaterial. The nails were an added feature because he was a carpenter.
This is just another example of non-believers trying to cast aspersion on the Bible by pointing out totally meaningless "differences". The fact is that Christ, who was perfect, suffered and died on the cross to atone for our sins and reconcile us with our Heavenly Father, who is perfect and holy. (Behold the Lamb of God, who taketh away the sins of the world.")
Therefore, in my opinion, we don't need to worry about where the nails were placed in Jesus' "hands". We should thank Him for dying to sin in our place so that we might gain eternal life through His sacrifice.