A Doctor At Calvary: The Passion of Our Lord Jesus Christ as Described by a Surgeon Pierre Barbet, M.D. This is probably the single best book. I have given it to several priests over the years as a gift for Lent.
The Crucifixion ol Jesus, Completely Revised and Expanded, A Forensic Inquiry by Frederick T. Zugibe. If you get the two-disc, Definitive Edition of the Passion of The Christ he is one of the people interviewed in the section on crucifixition.
DVD How Jesus Died: The Final 18 Hours Trinity Pictures Ltd. This includes sections with interviews with Frederick Zugibe and with Dr. John Bonica, one of the founding fathers of the modern study and understanding of pain and its treatment.
DVD Crucifixtion The History Channel.