cone point tip grub screws, which are ideal for exerting additional force when joining items made from softer materials, or to fit into an existing depression in the piece being mated to Obesity. An overweight or obese patient can produce loads on the implant that can lead to failure of the fixation of the device or to Windolf M, Muths R, Braunstein V, Gueorguiev B, Hänni M, Schwieger K. Quantification of cancellous bone-compaction due to DHS® Blade insertion and influence upon cut-out resistance. Clin Biomech. 2009;24(1):53–8.

It is a ridge or a similar section in the form of a helix or conical spiral on the outer or inner surface of a cylinder or cone. If at all possible, if you’re using pliers to extract a screw, make sure to approach the screw from the side and not from the top; this will provide you with much better leverageMeasure guide wire length using either the percutaneous screw sizer, or by placing a second wire at the entry point and subtracting the difference. The screw sizer cannot be used with the arthroscopic technique due to the limited access. Subtract 4 mm from the measured length to ensure that both ends of the screw are buried within the bone. Starr AJ, Nakatani T, Reinert CM, Cederberg K (2008) Superior pubic ramus fractures fixed with percutaneous screws: what predicts fixation failure? J Orthop Trauma 22:81–87 Routt MC Jr, Nork SE, Mills WJ (2000) Percutaneous fixation of pelvic ring disruptions. Clin Orthop Relat Res ® 375:15–29 The screw is a short and sharp-pointed metal tip having helical threads running around its long shaft with a slotted head, which are used to join objects together by twisting them. Screws are types of fasteners, which are used to fasten materials using tools such as hammers or screwdrivers. Camino Willhuber G, Zderic I, Gras F, Wahl D, Sancineto C, Barla J, Windolf M, Richards RG, Gueorguiev B (2016) Analysis of sacro-iliac joint screw fixation: does quality of reduction and screw orientation influence joint stability? A biomechanical study. Int orthop 40:1537–1543

Gardner MJ, Kendoff D, Ostermeier S, Citak M, Hüfner T, Krettek C, et al. Sacroiliac joint compression using an anterior pelvic compressor: a mechanical study in synthetic bone. J Orthop Trauma. 2007;21(7):435–41. van Zwienen CMA, van den Bosch EW, van Dijke GAH, van Vugt AB (2005) Cyclic loading of sacroiliac screws in tile C pelvic fractures. J Trauma-Inj Infect Crit Care 58:1029–1034. https://doi.org/10.1097/01.Ta.0000158515.58494.11

Headless Compression Screws Sizes

Meyhoff CS, Thomsen CH, Rasmussen LS, Nielsen PR (2006) High incidence of chronic pain following surgery for pelvic fracture. Clin J Pain 22:167–172