Correction of Valgus Knee Deformity by Hemiepiphyseodesis: a Restrospective Analysis

PURPOSE OF THE STUDY Hemiepiphyseodesis is commonly used to correct a coronal plane knee deformity during childhood. Since 2007 Blount staple method has been replaced by the eight-Plate Guided Growth System. We retrospectively analysed indications, results and complications of older so as compare them with newer system. MATERIAL AND METHODS In period from 2009 2019, total 98 lower extremities 54 patients were treated hemiepiphyseodesis. Lateral distal femoral angle (LDFA), medial proximal tibial (MPTA) mechanical axis deviation (MAD) measured before after correction. focused on location hemiepiphyseodesis (distal femur/proximal tibia/both), operative time compared implanting 2 or 3 staples. RESULTS The primary correction valgus was achieved in 97%, which only partial observed 9.2% slight overcorrection 6.1%. A 4 (4.1%) underwent subsequent corrective osteotomy. mean LDFA increased 80° 86°, while MPTA decreased 94° 92°. MAD 23 mm mm. reported complication rate 5.1%, including four cases loosening staples one case superficial infection. DISCUSSION It verified that reduction correlates implantation into femur, conversely increase correlated tibia both locations. number implanted (2 3) did not affect size resulting correction, but statistically significantly shorter when instead implanted. CONCLUSIONS an method, it still gives very good low complications. operating can be shortened using only, same effect. parameters are helpful identifying key success treatment remains timing sufficient growth potential. Key words: hemiepiphyseodesis, guided growth, deformity, staple.