What is the prognosis of subtalar and ankle instability resulting from ankle sprains?

Updated: Jan 14, 2019
  • Author: Craig C Young, MD; Chief Editor: Sherwin SW Ho, MD  more...
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Results are limited for subtalar instability, because this condition is mostly recognized during surgery for chronic lateral ligamentous instability. Most of the available results are intermingled with the results of lateral ankle procedures.

Chrisman and Snook had 3 patients with subtalar and ankle instability that were treated by their eponymous procedure. [37] One patient had a failed Watson-Jones procedure with persistent instability. The 3 patients with subtalar instability had a 20° limitation of inversion compared with the opposite, normal side. These patients had no symptoms of instability at 2- to 6 year follow-up. [38]

Posttraumatic osteoarthritis is common in patients with repetitive ankle injuries. One study estimates that approximately 12% of the overall prevalence of osteoarthritis (OA) is in fact posttraumatic OA of the hip, knee, or ankle. The financial burden is significant, estimated at $3.06 billion dollars annually. [39]

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