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4DCS fixation to the distal fragment

Correct guide-wire insertion depth.

Pitfall: too long a guide wire
It is important to remember that the distal femur tapers from the posterior to the anterior. Therefore, if a straight AP view is obtained, the guide wire can appear to be inside the bone. If it appears to be outside the bone, it is most likely too long and the DCS will cause pain and possibly heterotopic ossification. In order to assess the exact length of the guide wire obtain an AP view with 30° internal rotation of the lower extremity.