Deformities of the Lower Extremities in Hereditary Multiple Exostoses / 대한정형외과학회잡지

ABSTRACT

PURPOSE: This study was done to analyze the alignment and deformity of the lower extremity in hereditary multiple exostoses patients. MATERIALS AND METHODS: We enrolled 32 patients who were diagnosed as having hereditary multiple exostoses (HME) between January 2001 and December 2007. Based on age at diagnosis, we categorized them into 4 groups, A (0-5 years 6 patients), B (6-10 years 7 patients), C (11-15 years 7 patients) and D (>16 years 12 patients). We measured mechanical axis deviation, This included femorotibial mechanical angle (a), inferolateral angle (b), femoral mechanical proximal anatomical angle (c), femoral mechanical distal anatomical angle (d), distal tibia inferolateral angle (e) and femoral neck-shaft angle (f). We analyzed for differences among the groups of different ages. RESULTS: The average femorotibial mechanical angles (a) of Groups A/B/C/D were respectively, 178.5degrees/180.3degrees/182.5degrees/183.5degrees (p<0.05). Distal tibia inferolateral angles (e) were respectively, 91.9degrees/93.5degrees/94.2degrees/102.9degrees (p<0.05). The mechanical axis deviation of groups A, B, C, and D, respectively, were 1.7 mm, 6.0 mm, 9.6 mm, and 13.4 mm (p<0.05) on the right side, and 2.9 mm, 7.6 mm, 12.2 mm, and 15.2 mm (p<0.05) on the left side. CONCLUSION: Patients with HME have a tendency towards having valgus deformities of the knee and ankle joints, which tend to increase with age.