Rigid stepped plate for internal fixation for high tibial osteotomy.
High tibial osteotomy is regarded as an effective treatment for unicompartmental arthrosis of the knee, but the optimal fixation method has not yet been devised. The purpose of this study was to confirm the superior strength of a rigid stepped plate as compared to a 4-hole L-plate device. Lateral closing-wedge high tibial osteotomy was performed on 30 ten-month-old porcine tibiae. Fifteen tibiae were fixed using a rigid stepped plate and 15 were fixed with a 4-hole L-plate. Three types of deforming force-compression, valgus bending, and varus bending-were each applied to 5 pair of tibiae fitted with either the rigid stepped plate or the L-plate using a mechanical testing apparatus. Values of load, displacement, and stiffness were analyzed to compare the fixation powers. Mean stiffness in the rigid stepped plate and L-plate groups were 977.8 (SD 230.3) and 836.2 (SD 248.4) N/mm for compression testing (P=.465), 38.7 (SD 12.9) and 21.6 (SD 9.6) N/mm for valgus bending (P=.047), and 62.3 (SD 18.1) and 29.8 (SD 9.7) N/mm for varus bending (P=.009), respectively. The rigid stepped plate has greater fixation strength than the conventional 4-hole L-plate. Given this improved level of fixation with the rigid stepped plate, immobilization duration after high tibial osteotomy could be shortened and complications reduced.
Yoo
Jae Ho
JH
Department of Orthopedic Surgery, Soonchunhyang University Hospital, Bucheon, Gyeonggido, South Korea.
Seong
Sang Cheol
SC
Lee
Sahnghoon
S
Choi
Kuiwon
K
Lee
Moon Kyu
MK
Lee
Changyang
C
Lee
Myung Chul
MC
D000818:Animals; D001696:Biomechanical Phenomena; D001860:Bone Plates; D019245:Compressive Strength; D004195:Disease Models, Animal; D019544:Equipment Failure Analysis; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D020370:Osteoarthritis, Knee / Q000601:surgery; D010027:Osteotomy / Q000295:instrumentation* / Q000379:methods; D018583:Pliability; D013264:Stifle / Q000503:physiopathology / Q000601:surgery*; D013314:Stress, Mechanical; D013552:Swine; D013977:Tibia / Q000503:physiopathology / Q000601:surgery*