Back to Search
Start Over
Primary stability of hamstring graft fixation with biodegradable suspension versus interference screws.
- Source :
-
Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association [Arthroscopy] 2005 Mar; Vol. 21 (3), pp. 266-74. - Publication Year :
- 2005
-
Abstract
- Purpose: During the early postoperative period, the stability of the fixation of a hamstring graft to the bone tunnel is the primary factor in limiting rehabilitation. The aim of this study was to evaluate if the initial fixation strength of a new suspension screw is comparable to that of the biodegradable interference screw fixation technique in the hamstring reconstruction of the anterior cruciate ligament (ACL).<br />Type of Study: Experimental laboratory study.<br />Methods: We evaluated the initial fixation strength of a biodegradable poly-L-lactide/tri-calcium phosphate (PLLA/TCP) screw that suspended the graft in the bone tunnel and compared it with the strength of an interference screw for fixation of hamstring grafts in ACL reconstruction using bovine knees. Single-cycle and cyclic loading tests were performed using a materials testing machine.<br />Results: The suspension screw provided a significantly higher yield load and ultimate failure load than the interference screw. There was no significant difference in the stiffness of both techniques. The typical failure mode for the suspension screw was fracture of the screw and for the interference screw it was slippage of the graft past the screw. In cyclic testing, both methods of fixation ran out to 1,000 cycles up to 250 N with a mean displacement of 2.6 mm (range, 1.8 to 3.3 mm) for the suspension screw and 4.1 mm (range, 2.3 to 6.0 mm) for the interference screw. Only the grafts fixed with the suspension screw survived a protocol with 1,000 cycles up to 400 N.<br />Conclusions: Our biomechanical data suggest that hamstring graft fixation using a biodegradable PLLA/TCP suspension screw provides an alternative to interference screw fixation.<br />Clinical Relevance: Hamstring graft fixation using a suspension screw provides a reasonable alternative to interference screw fixation.
- Subjects :
- Animals
Biomechanical Phenomena
Cattle
Equipment Design
Equipment Failure Analysis
In Vitro Techniques
Stress, Mechanical
Tensile Strength
Weight-Bearing
Absorbable Implants
Anterior Cruciate Ligament surgery
Bone Screws classification
Bone-Patellar Tendon-Bone Grafting instrumentation
Muscle, Skeletal surgery
Tibia surgery
Subjects
Details
- Language :
- English
- ISSN :
- 1526-3231
- Volume :
- 21
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association
- Publication Type :
- Academic Journal
- Accession number :
- 15756178
- Full Text :
- https://doi.org/10.1016/j.arthro.2004.10.011