Abstract
Purpose
To review the natural history of posteromedial bowing of the tibia and the outcome of limb reconstruction in this condition.
Patients and Methods
38 patients with posteromedial bowing of the tibia presenting between 2000–2016 were identified. Mean follow up from presentation was 78 months. Seventeen patients underwent lengthening and deformity correction surgery, whilst 3 further patients are awaiting lengthening and deformity correction procedures.
Results
The greatest correction of deformity occurred in the first year of life, but after the age of 4 years, remodelling was limited. The absolute leg length discrepancy (LLD) increased throughout growth with a mean 14.3% discrepancy in tibial length. In the lengthening group, mean length gained per episode was 45mm (35–60). Mean duration in frame was 192 days, with a healing index of 42.4 days/cm. Significantly higher rates of recurrence in LLD were seen in those undergoing lengthening under the age of 10 years (p=0.046). Four contralateral epiphysiodeses were also performed.
Conclusions
Posteromedial bowing of the tibia improves spontaneously during the first years of life, but in 20/38 (53%) patients, limb reconstruction was indicated for significant residual deformity and/or worsening length discrepancy. For larger discrepancies and persistent deformity, limb reconstruction with a hexapod external fixator is an effective technique and should be considered as part of the treatment options.
Level of evidence
Level 4 (Case series)
