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Self-Compression Magic Pins

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Self Compression Magic Pins

General Principles

1. Three shaft diameter/thread diameter
combinations are available.

Each of the above is/are available in a variety of thread lengths, but the total length of each implant is a uniform 120 mm. Choose the appropriate implant according to the fracture pattern and the anatomical site. Insert the implant without pre-drilling or tapping. Do not bend the implant during insertion into the bone, since this might lead to breakage. Determine the intended position of the implant before insertion.

2. Reduce the fracture anatomically. Use forceps where possible for reduction and interfragmentary compression.

3. Verify Reduction

4. Measure the implant thread length required preoperatively on the X-ray or determine it by overlaying an implant of adequate size.

5. Insert the implant percutaneously until the chamfer meets the near cortex

6. A second implant ensures rotational stability. Cut the implants just above the chamfer. Whenever possible, the cut end should be covered with skin. In cases when the cut end can not be covered with skin, leave the end exposed and cover with a sterile dressing. Leave the implants in place until fracture healing, normally for 6-8 weeks; remove them when necessary using the extractor.

Compression Effect

The compression effect can be obtained in two ways:

1. If, for example, you have a Condylar Fracture and the bone fragment requires reattachment, the implant is inserted through the lateral aspect of the segment and seated into the far cortex. When the tip reaches the cis cortex, the speed of the insertion of the implant must be reduced. As the implant meets the resistance of the hard cortical bone, the thread makes several revolutions without advancing initially, leading to a gliding hole proximally and a threaded hole distally. When the chamfer and the washer reach the bone, the two fragments will be compressed together. Insertion should be stopped at this point.

2. In the example shown, and inter-metacarpal dislocation resulted in widening of the space between adjacent metacarpal heads. The implant is first drilled into the near metacarpal producing a threaded hole. On reaching the far metacarpal it also produces a threaded hole. At the moment the washer reaches the near metacarpal cortex, the implant revolves without advancing, thus producing a gliding hole in the nearmetacarpal. This allows the two metacarpal heads to approximate.