Langfitt MK, Best BJ, Carroll EA. A useful tool for retained washer retrieval when removing iliosacral screws. J Surg Orthop Adv. 2013;22(4):330–2.

The loading protocol commenced with an initial nondestructive quasi-static ramp from 20 N preload to 200 N at a rate of 18 N/s, followed by progressively increasing cyclic loading in axial compression with a physiological profile of each cycle at a rate of 2 Hz [ 17]. Keeping the valley load at a constant level of 20 N, the peak load, starting at 200 N, was monotonically increased cycle by cycle at a rate of 0.05 N/cycle until the test stop criterion of 10 mm actuator displacement had been fulfilled with respect to its position at the beginning of the loading protocol, which was found adequate to provoke catastrophic failure of the specimens [ 18, 19]. Data acquisition and analysis Group FT: Stabilization of the posterior pelvis ring with two 7.3 mm fully threaded cannulated SI screws and washers, 90 mm in length for S1 and 65 mm in length for S2. Blohm D, Madsen F, Jensen J (2000) Fractures of the pelvis–a survey of" nonunion" and" malunion" surgical results. Ugeskr Laeg 162:6413–6415

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 Bone screws are the most commonly used orthopedic implants. There are many different types and sizes of screws for different types of bones. Most bone screws are made out of stainless steel or titanium alloys. The outer diameter, root diameter, and thread pitch and angle are important in determining screw mechanics. All you need to do here is to get some needle nose pliers to grasp the shank of the screw, and then screw it out. Yes, this is the easiest method to remove a headless screw. But it is also very limited in use and if you found yourself here, chances are that you are simply not able to grab the screw with pliers. 2. Using a Utility Knife and Pliers What is important to note here is that these various techniques for removing a broken or headless screw are not really as much separate from each other as they are escalations from one to the next. Suzuki T, Hak DJ, Ziran BH, Adams SA, Stahel PF, Morgan SJ, et al. Outcome and complications of posterior transiliac plating for vertically unstable sacral fractures. Injury-Int J Care Injured. 2009;40(4):405–9.

In recent years, I have noted a shift towards headless screw usage in multiple foot and ankle applications. In my observation, headless screws boast a low-profile design with the ability to bury the screw below the bone’s cortical surface leading to decreased soft tissue adhesion and irritation. But, are we getting the best screw for those perks? Advance the guide wire through the far cortex so that it lies in the subcutaneous tissues. This minimizes the risk of accidental withdrawal of the guide wire while drilling and facilitates wire removal if it should break. Solomon LB, Pohl AP, Sukthankar A, Chehade MJ (2009) The subcristal pelvic external fixator: technique, results, and rationale. J Orthop Trauma 23:365–369 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. Oberst M, Konrad G, Herget GW, El Tayeh A, Suedkamp NP. Novel endoscopic sacroiliac screw removal technique: reduction of intraoperative radiation exposure. Arch Orthop Traum Su. 2014;134(11):1557–60.Cannulated Screws are placed. Placement is confirmed by lateral and axial fluoroscopy views in the operating room. Place the soft tissue guide over the guide wire and open the near cortex using the appropriate cannulated profile drill.