The Journal of Bone and Joint Surgery, Vol 76, Issue 9 1363-1370, Copyright © 1994 by Journal of Bone and Joint Surgery, Inc
Talocalcaneal coalition in patients who have fibular hemimelia or proximal femoral focal deficiency. A comparison of the radiographic and pathological findings
DP Grogan, GR Holt and JA Ogden
Shriners Hospital for Crippled Children, Tampa, Florida 33612-9499.
The prevalence of congenital anomalies of the foot was studied in
ninety-nine children (105 limbs) who had fibular hemimelia or proximal
femoral focal deficiency, or both. Twenty-six of these patients had had a
Syme amputation at our institution and the specimens were analyzed
anatomically; they were found to include fourteen talocalcaneal coalitions
(54 per cent). The preoperative radiographs of these same patients,
however, revealed only four such coalitions (15 per cent). Thirty-seven of
the ninety-nine patients had had a Syme amputation previously at another
facility (with subsequent follow-up at our institution), and ten of them
(ten feet) had radiographs that were adequate for analysis of congenital
anomalies. Forty-two feet that had not yet been amputated were also
analyzed radiographically. Nine of these fifty-two feet included in the
radiographic analysis had a talocalcaneal coalition, a radiographic
prevalence similar to that found on the preoperative radiographs of the
twenty-six patients included in the anatomical analysis. The true
prevalence of talocalcaneal coalition remains to be determined; however,
this can be done only at the time of skeletal maturity. Examination of the
twenty-six amputation specimens revealed only one talocalcaneal coalition
in the nine patients who had proximal femoral focal deficiency alone, six
such coalitions in the eight patients who had only fibular hemimelia, and
seven coalitions in the nine patients who had both proximal femoral focal
deficiency and fibular hemimelia. These findings should be useful in the
evaluation of the radiographic anatomy of the feet in children who have
proximal femoral focal deficiency or fibular hemimelia, or both,
particularly if limb-lengthening is considered as a treatment option.