Axial and torsional stability of an improved single-plane and a new bi-plane osteotomy technique for supracondylar femur osteotomies
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : J.-M. Brinkman • C. Hurschler • A. E. Staubli • R. J. van Heerwaarden
- چاپ و سال / کشور: 2010
Description
Purpose An important disadvantage of the standard medial closing-wedge distal femur osteotomy for lateral compartment osteoarthritis of the knee is the immediate effects on the extensor mechanism function. Therefore, a novel bi-plane osteotomy technique was developed. The stability and stiffness of this newly developed technique and a modification of the proximal screw configuration were tested in a composite femur model and compared to the standard single-plane technique. Research question was if the new bi-plane technique and/or modified screw configuration would improve the stability and stiffness of the construct. Methods In 12 femurs, motion at the osteotomy under axial and torsion loading was measured using a 3D motion analysis system. All were subsequently tested to failure. The data recorded were used to calculate stability and stiffness of the constructs. Results The stability and stiffness were highest in the biplane technique under axial loads, but were lower under torsional loading, compared to the single-plane technique. The screw configuration modification improved axial stability and stiffness, but had no influence on torsional stability. Conclusion In replicate femurs, the new bi-plane technique improved axial stability, but in contrast to what was theorized, decreased torsional stability, compared to the single-plane technique. The addition of a bi-cortical screw proximally improved stability under axial loading, but not torsion. Further clinical testing will have to prove if early full weight bearing using the new bi-plane technique is possible.
Knee Surg Sports Traumatol Arthrosc (2011) 19:1090–1098 DOI 10.1007/s00167-010-1349-0 Received: 16 February 2010 / Accepted: 25 November 2010 / Published online: 15 December 2010
