This is a plain-English translation of the academic paper above, prepared for patients, referring clinicians, and other non-specialist readers. It preserves the structure of the original paper while removing technical jargon. For the full clinical paper, follow the PubMed or DOI links.
Background
How close the radial nerve — one of the major nerves of the arm — passes to the metal pins that surgeons place into the lower end of the upper-arm bone (humerus) when applying an external fracture-stabilising frame. We placed pins in 20 cadaveric arms using the standard technique and then dissected to see what happened to the nerve.
Rationale
External-fixator frames are useful for stabilising upper-arm fractures, especially in complex situations. The pin insertion is done percutaneously — through a small skin incision, without exposing the deeper anatomy. The radial nerve runs in this region and controls extension of the wrist and fingers; injury to it leaves a noticeable disability. There were few published studies on how often pin insertion endangered the nerve.
Results
Of 40 pins placed in 20 arms, four had directly pierced the radial nerve, and a further nine were in direct contact with it. In other words, more than 30% of pin insertions had a worrying relationship to the nerve. The percutaneous “blind” technique alone is not safe enough.
Implications
For patients having a humeral external fixator applied, the surgeon should make a generous skin incision, dissect bluntly down to the bone, and retract soft tissue out of the way before drilling the pin in. The study has had a real influence on technique — modern teaching now treats the radial nerve as actively at risk during this procedure.
Source: Clement H, Pichler W, Tesch NP, Heidari N, Grechenig W. Anatomical basis of the risk of radial nerve injury related to the technique of external fixation applied to the distal humerus. Surgical and Radiologic Anatomy 2010;32(3):221-4. doi:10.1007/s00276-009-0568-x
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