Sir,
We read this article with interest but we found some areas of
concern.
The methodology section does not state clearly the inclusion criteria
used for this study; the population is not clearly specified. Eighty-five per cent of
cases of ankle instability can be managed non-operatively with a period of
ankle bracing and physiotherapy.1,2 The study does not mention which
patients did and which patients did not have physiotherapy before surgery was undertaken.
Secondly, there appears to be an absence of pre-operative scoring of
the patients. Therefore, it was not possible to analyse post-operative
improvement, for which only talar tilt and anterior drawer test were
available as an assessment tool. In addition, these analyses were
performed without radiographic screening and scored using an unvalidated
clinical assessment system. The remainder of the assessments relied on
post-operative scoring only and comparison with the contralateral ankle
movements.
Plain radiographs used to determine the progression of osteoarthritis deteriorated at final follow-up and correlate poorly with ankle
function. Finally, a complication rate of 8.7% (two patients out of 23) could
hardly be described as being very low.
In conclusion, with the data and the results presented in this study
there is not enough evidence to state that the Duquennoy technique is an
effective method of improving ankle function in patients with chronic
instability with a very low rate of complications.
S.J. Lipscombe,
Orthopaedic SpR,
J. Sanchez-Ballister,
Whiston and St. Helen's Hospitals,
Merseyside, UK.
1. Karlsson J, Lansinger O. Chronic lateral instability of the ankle in
athletes. Sports Med 1993;16:355-65.
2. Trevino SG, Davis P, Hecht PJ. Management of acute and chronic lateral
ligament injuries of the ankle. Orthop Clin North Am 1994;25:1-16.