Ökad risk för skada?

Vore kul att höra Dr8as åsikt om den disskussion som föregår just nu där Jens propagrar för krimp och hård träning för Barn och ungdom trots att det finns medicinsk data som pekar på att detta innebär ökad risk för artros och andra permanenta skador. Datan som Jens anser vara undermålig och ej bevisande är: During a discussion on the Swedish 8a site it has become clear that Mr 8a Jens Larssen considers that the existing data not enough to prove climbing hard and especially crimping by young climbers (kids and youth)  is not causing any increased risk for injuries. He is therefore promoting that kids and youth should use crimps and climb hard from the start, where there is clear medical proof  that this is increasing the risk for arthritis and injuries like this : http://bjsm.bmj.com/content/41/12/852/F2.large.jpg Do you think that Mr8a has the right pre conditions to make these assumption? Do you think it is right of Mr8a to risk the future of young climbers? Who do you believe more, Mr8a or medical professionals? The contested material published is:   http://bjsm.bmj.com/content/41/12/852.full ( http://www.ncbi.nlm.nih.gov/pubmed/16225880  ,  http://www.ncbi.nlm.nih.gov/pubmed/21576719        ,  http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1724320/pdf/v035p00181.pdf and http://libris.kb.se/bib/9977029 Tack på förhand