horizontal or vertical plane or both or substantially planar as depicted with the first and second bearing surfaces 242 and 244 respectively further third and fourth bearing surfaces 248 and 250 can include anti expulsion features as described for the first and second bearing surfaces 242 and 246 further transverse wall 246 can include a tool engaging portion as described for transverse wall 240 including a threaded bore and a driving indent reference will now be made to use of mesh implants 10 110 and 210 to support adjacent weak bony structures typically mesh implants 10 110 and 210 can be inserted into a bone structure after preparation of a suitable bone cavity for example implants can be inserted into the cavity resulting from harvesting an autograft from the iliac crest often harvesting autografts leads to significant post operative pain and lengthy recovery time use of the implants disclosed in this invention facilitates reconstruction of the cavity and accommodates a quicker recovery time often with less pain to the patient referring now to fig1 14 a selected portion of the iliac crest 260 is removed using a surgical cutting device such as for example a chisel 262 or a bone saw after the selected region 264 of the iliac crest has been cut the cut bone autograft 266 is removed from the residual bone structure 260 u2032 of the patient as depicted in fig1 an implant as described in the present invention is selected for cavity 268 and to matingly engage in the adjacent bone structures 270.