eMedicine Specialties > Orthopedic Surgery > Foot & Ankle
Recurrent Ankle Sprains: Follow-up
Updated: Feb 15, 2008
Outcome and Prognosis
If recurrent ankle sprains are treated early and appropriate rehabilitation is initiated, the prognosis is excellent with conservative treatment.36,37,38 The prognosis becomes even more important to consider for those who require surgical correction. Reconstructive procedures can vary significantly in their ability to correct any persistent instability. (See Surgical therapy for a discussion of the percentage ranges of persistent instability following each procedure.)
The Chrisman-Snook procedure seems to have the least incidence of objective instability of the procedures discussed earlier (see Surgical therapy). There are biomechanical data to support the more anatomic reconstructions.31 These procedures tend to restore the ligamentous force patterns more closely to the normal patterns than the tenodesis procedures.
With respect to chronic syndesmotic sprains, long-term outcome studies are few in number. In a study conducted at West Point, all patients who were studied returned to full duty without further problems. One of these patients was surgically treated, and all had full range of motion in the ankle.10
Edwards and DeLee studied 6 cases of patients with frank diastasis.39 In the 4- to 60-month follow-up period, one case of postoperative skin slough healed uneventfully, and one fixation device failed. Four cases had good results, and 2 had fair results in that the patients had residual mild ankle pain and restricted range of motion. Katznelson et al reported on 5 patients with subacute or chronic syndesmotic injury.40 Each was treated with operative stabilization and bone grafting to the tibiofibular joint, which formed a synostosis. By 10 weeks, all the affected ankles had achieved fusion with no complications. One patient developed traumatic osteoporosis that resolved in 6 months. This patient had mild loss of dorsiflexion.
Results are also 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.27 One patient had a failed Watson-Jones procedure with persistent instability. The 3 patients with subtalar instability had a 20 º limitation of inversion compared with the opposite, normal side. These patients also had no symptoms of instability at 2-6 years of follow-up.8
Future and Controversies
It is controversial whether arthroscopy is warranted in those patients with known instability who require reconstruction. Some investigators believe that the pathology can be addressed in an open fashion. Those who favor arthroscopy claim that this procedure provides a more detailed view of the ankle joint anatomy and provides ease in the identification of any additional pathology.41,42
Another controversy that exists surrounds the value of stress radiography in the evaluation of a sprained ankle.28 Those who argue against radiography note that stress radiography does not reliably detect a difference between the injured and uninjured sides all of the time. They also note that laxity in the joint does not correlate with the patient's symptoms.
Future ideas for the treatment of chronic ankle instability are promising. One novel idea is to transfer the peroneus tertius tendon so that it can act as a dynamic stabilizer. This procedure is thought to add to the proprioceptive stability of the ankle joint, and it is not technically complex, making it a desirable treatment. Despite the apparent advantages, however, long-term follow-up studies are lacking. A sample search of the literature resulted in 2 studies regarding the peroneus tertius tendon transfer procedure for the purpose of stabilizing the ankle.43,44 Other studies investigated the use of this procedure for correction of drop foot deformities45 and for clawfoot deformities.46
Other procedures for lateral ligamentous reconstruction include using the medial one third of the Achilles tendon, the plantaris tendon, bovine collagen, and carbon-fiber prosthetic ligaments. Follow-up studies are inadequate for these procedures as well.
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Further Reading
Keywords
recurrent ankle instability, chronic ankle sprain, chronic ankle instability, subtalar instability, functional ankle instability, chronic medial ligament instability, mechanical ankle instability
Follow-up: Recurrent Ankle Sprains