TY - JOUR
T1 - Biomechanical comparison of oblique and step-cut osteotomies used in total hip arthroplasty with femoral shortening
AU - Yıldız, Fatih
AU - Kılıçoğlu, Önder
AU - Dikmen, Göksel
AU - Bozdağ, Ergun
AU - Sünbüloğlu, Emin
AU - Tuna, Meral
N1 - Publisher Copyright:
© 2016 The Japanese Orthopaedic Association
PY - 2016/9/1
Y1 - 2016/9/1
N2 - Background Various types of shortening osteotomies and prosthesis are used for femoral reconstruction in total hip arthroplasty of the high hip dislocation. This biomechanical study investigates whether step-cut osteotomies result in better stability than oblique osteotomies and cylindrical femoral stems enhance stability of the osteotomy more than conical stems, and which osteotomy and prosthesis type maintain the stability better after cyclical loading. Methods Oblique and step-cut shortening osteotomies were compared under axial and rotational forces, using synthetic femur models and conical or cylindrical femoral prostheses. The models underwent cyclic loading for 10,000 cycles at 3 Hz (100–1000 N axial bending or 0.5–10 Nm torque). After the completion of cyclic loading, the models were loaded until failure. Stiffness values before and after cyclical loading, and failure loads were the outcome parameters. Relative displacements at the osteotomy sites were also measured using 3-Dimensions Digital Imaging Correlation System. Results The mean failure load was significantly higher in conical prosthesis groups under axial forces. In torsion tests, the mean stiffness of conical prosthesis groups after cyclical loading was higher in oblique osteotomies. The other parameters were similar between the groups. Conclusions According to the results of the study, although some individual statistically significant parameters were obtained, step-cut osteotomies, which are technically challenging procedures, were not found biomechanically superior to oblique osteotomies, with neither conical nor cylindrical prostheses.
AB - Background Various types of shortening osteotomies and prosthesis are used for femoral reconstruction in total hip arthroplasty of the high hip dislocation. This biomechanical study investigates whether step-cut osteotomies result in better stability than oblique osteotomies and cylindrical femoral stems enhance stability of the osteotomy more than conical stems, and which osteotomy and prosthesis type maintain the stability better after cyclical loading. Methods Oblique and step-cut shortening osteotomies were compared under axial and rotational forces, using synthetic femur models and conical or cylindrical femoral prostheses. The models underwent cyclic loading for 10,000 cycles at 3 Hz (100–1000 N axial bending or 0.5–10 Nm torque). After the completion of cyclic loading, the models were loaded until failure. Stiffness values before and after cyclical loading, and failure loads were the outcome parameters. Relative displacements at the osteotomy sites were also measured using 3-Dimensions Digital Imaging Correlation System. Results The mean failure load was significantly higher in conical prosthesis groups under axial forces. In torsion tests, the mean stiffness of conical prosthesis groups after cyclical loading was higher in oblique osteotomies. The other parameters were similar between the groups. Conclusions According to the results of the study, although some individual statistically significant parameters were obtained, step-cut osteotomies, which are technically challenging procedures, were not found biomechanically superior to oblique osteotomies, with neither conical nor cylindrical prostheses.
UR - http://www.scopus.com/inward/record.url?scp=84989954626&partnerID=8YFLogxK
U2 - 10.1016/j.jos.2016.04.015
DO - 10.1016/j.jos.2016.04.015
M3 - Article
C2 - 27292115
AN - SCOPUS:84989954626
SN - 0949-2658
VL - 21
SP - 640
EP - 646
JO - Journal of Orthopaedic Science
JF - Journal of Orthopaedic Science
IS - 5
ER -