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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: J Orthop Trauma. 2018 Nov;32(11):554–558. doi: 10.1097/BOT.0000000000001283

FIGURE 1.

FIGURE 1

Measurement method for determining the amount of shortening along the helical blade. A, The amount of blade protruding medial to the barrel of the nail is measured and compared with the measurement of the entire blade once the nail has been placed intraoperatively. B, This is repeated for the follow-up radiograph 6 months after surgery. The change in percentage between these 2 measurements is applied to the actual length of the blade, which was recorded in the operative record. In this example, the percentage changed from 69% to 57% along a blade of length 90 mm, indicating that 10.8 mm of shortening had occurred [(0.69–0.57) × 90 = 10.8 mm]. Editor’s Note: A color image accompanies the online version of this article.