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Mechanical comparison of fixation techniques for the offset V osteotomy: a saw bone study
Keith Jacobson1, Adam Gough, Samuel S Mendicino
1Harris County Podiatric Surgical Residency Program, West Houston Medical Center, Houston, TX, USA.
Summary
The strongest fixation for an offset V bunionectomy in saw-bone models used a 2.7-mm screw distally and a Kirschner wire proximally. This method demonstrated superior strength compared to other fixation techniques tested.
Area of Science:
- Orthopedic surgery
- Biomechanical engineering
- Podiatric surgery
Background:
- Offset V osteotomy is a surgical technique used to correct bunion deformities.
- The biomechanical stability of the osteotomy fixation is crucial for successful healing and functional outcomes.
- Various fixation methods exist, but their comparative strength in offset V osteotomies requires further investigation.
Purpose of the Study:
- To compare the fixation strength of four different techniques for offset V bunionectomy.
- To identify the optimal fixation method that provides the greatest resistance to failure in a saw-bone model.
Main Methods:
- Twenty identical saw-bone models underwent offset V osteotomy.
- Models were divided into four groups, each with a unique fixation configuration (screw placement and caliber).
- Fixation strength was assessed using a servo-hydraulic testing machine until failure, with failure patterns analyzed via video.
Main Results:
- Group 4, utilizing a 2.7-mm cortical screw distally and a 0.062-inch Kirschner wire proximally, exhibited significantly higher mean failure force (105.66 N) compared to other groups (58.1 N, 59.3 N, 64.0 N).
- No significant difference in failure strength was observed between groups 1, 2, and 3.
- Failure modes differed, with group 4 showing a higher proportion of proximal screw hole failures (60%) compared to distal screw hole failures (40%).
Conclusions:
- The combination of a distally placed 2.7-mm cortical screw and a proximally placed threaded 0.062-inch Kirschner wire provides the strongest fixation for offset V osteotomies in this saw-bone model.
- This specific fixation technique may offer improved biomechanical stability, potentially leading to better clinical outcomes in bunionectomy procedures.