Abstract
From 1994 to 2004, the authors treated 17 patients (nine males and eight females) with Blount disease admitted to the Disabled Children’s Home in Naro Moru (Kenya). Age at intervention ranged from 2 to 16 years (mean 8). In sevencases, the deformity was unilateral and mean age was 8.9 years; in the remaining 10 the deformity was bilateral and mean age was 8.5 years. Tibial proximal metaphyseal corticotomy was performed in 13 cases, and it was associated with calf bone osteotomy in patients aged over 5 years. In eight cases, metaphyseal osteotomy was associated with bone graft from homolateral calf bone and synthesis with Kirschner wire or “staples”, in nine it was performed without bone graft, and in one with axial external fixation. Complications included the following: infection with common peroneal nerve paresis treated with antibiotic therapy and transposition of tibialis posterior to tibialis anterior (one case); relapse of deformity treated with a new osteotomy (one case); incomplete correction (two cases); and pseudoarthrosis with loss of correction treated with a new osteotomy, removal of the pseudoarthrosis area and axial external fixation (one case). Nine patients for a total of 15 tibias were followed up at 1–10 years (mean 5.2). Results were good in 10 cases, with aligned limb and stable knee, fair in three cases, with X-ray evidence of varus deformity < 15° and/or knee instability in orthostasis, and poor in two cases with deformity > 15°, knee instability, length discrepancy > 3 cm. Age at operation and consequent severity of joint deformity influenced the results. Good results were obtained mainly in patients with Blount disease degree 1–3, whereas poor results were obtained in most patients with epiphyseal deformity > degree 4.
