Posterior interosseous nerve dysfunction in the radial tunnel

SummaryDysfunction of the Posterior Interosseous Nerve (PIN) has previously been classified into two different groups: Posterior Interosseous Nerve syndrome (PINS) if motor weakness manifests or Radial Tunnel Syndrome (RTS) if forearm pain is the main feature. Its main differential diagnosis is the common Tennis Elbow. There is little evidence or consensus on incidence or aetiology or treatment. The findings of this review suggests that both RTS and PINS have a common aetiology, that some investigative modalities may be useful in the diagnosis of PIN dysfunction but require further trials to support initial findings. Management options are difficult to evaluate due to a lack of controlled trials however surgical results appear to be good considered in the light of questionable diagnosis.