What is the purpose of particulars in personal injury cases?

In Cansulex v. Perry, [1982] B.C.J. No. 369 (B.C.C.A.) Lambert J.A. summarized the function of particulars at para. 15 as follows: (1)to inform the other side of the nature of the case they have to meet as distinguished from the mode in which that case is to be proved; (2)to prevent the other side from being taken by surprise at the trial; (3)to enable the other side to know what evidence they ought to be prepared with and to prepare for trial; (4)to limit the generality of the pleadings; (5)to limit and decide the issues to be tried, and as to which discovery is required, and (6)to tie the hands of the party so that he cannot without leave go into any matters not included.