[Results of corrective surgery in juvenile cyphosis (scheuermann's disease) using Harrington's compressive rods (author's transl)].

The authors present the results of 20 corrective procedures for juvenile cyphosis using Harrington compressive rods and Hibbs spondylodesis. 16 procedures date back more than one year (average 3 years, 4 months). 10 cases of pure dorsal cyphosis. The pre-operative Cobb-angles for cyphosis averaged 52 degrees, postoperatively an average of 24 degrees was measured. This reflects a 57 p.c. average immediate correction (41 p.c. for pure dorsal cyphosis, 71 p.c. for dorso-lumbar cyphosis) following surgery nearly all cases showed a significant loss of correction (average 43 p.c., dorsal 37 p.c., dorso-lumbar 49 p.c.). Three main reasons for this loss of correction are discussed and documented in detail. 1. Mal-centered and too short a length of spondylodesis; 2. insufficient corrective growth of wedge shaped vertebral bodies post surgery and 3. frequent lumbar decompensation into total round back deformity of the pure thoracic spondylodesis. The following changes in procedure to solve the problem of loss of correction are proposed. 1. Combined posterior and anterior fusions and 2. upper lumbar dorsal fusion together with extended thoracic spondylodesis. The changing indication is discussed. The main but not fatal complication was postoperative wound infection (15 p.c.).