Abstract
The 8-plate (Orthofix, SRL, Italy) is a titanium extraperiosteal plate with 2 screws which acts as a hinge at the outer limits of the physis. It has been used for correction of both angular and sagittal deformity around the knee. To our knowledge this is the first study describing the use of 8-plates in leg length discrepancy (LLD) correction.
We aimed to evaluate outcomes of temporary 8-plate epiphysiodesis in LLD, and to assess the complications associated with its usage.
This retrospective study included 30 patients between 2007 and 2010 whom underwent 8-plate epiphysiodesis to address LLD.
Leg length measurements were recorded using erect full leg length scanograms and comparison made between pre-operative, interval and final scanograms. Any deviations of the mechanical axis were also recorded.
During the study period 34 epiphysiodeses were performed on 30 patients. There were 17 males and 14 females. The average age at the time of procedure was 10.7 years (range 3–15). Average time to final follow-up was 24 months (range 52–10). The average pre-operative LLD was 2.5 cm (range 1.5–6 cm). The mean overall rate of correction was 1.0 cm per year. The mean residual LLD at end of treatment was 1.1 cm (range 0–4.5 cm). Two patients experienced genu recurvatum deformity. This was associated with placement of distal femoral plates anterior to the mid-lateral line.
Based on our experience 8-plate epiphysiodesis is a reversible, minimally invasive procedure with reliable results in length correction. However, careful device placement is required to prevent deformity.
