Fixation of the offset V osteotomy: mechanical testing of 4 constructs

Area of Science:

• Orthopedic surgery
• Biomechanics
• Surgical fixation techniques

Background:

• The offset V osteotomy is a surgical procedure used in orthopedic interventions.
• Evaluating the mechanical stability of different fixation methods is crucial for successful surgical outcomes.

Purpose of the Study:

• To compare the mechanical properties of four distinct fixation methods for the offset V osteotomy.
• To determine the maximum load, failure energy, and stiffness of each fixation construct.

Main Methods:

• An offset V osteotomy was created in 10 sawbone specimens per group.
• Fixation was achieved using two 2.0-mm screws, two 2.7-mm screws, two 3.5-mm screws, or one 2.7-mm screw with a Kirschner wire.
• Specimens were subjected to destructive tensile loading using a computerized hydraulic-tensile testing machine.

Main Results:

• All four fixation constructs demonstrated comparable mean maximum load (113.0–144.0 N), failure energy (272.2–365.0 J), and stiffness (21.3–27.0 N/mm).
• The 3.5-mm screw group showed statistically significant differences in all parameters compared to the intact control group.
• Other fixation groups showed significant differences in maximum load and failure energy, but not stiffness, versus the control.

Conclusions:

• All four tested constructs exhibit similar mechanical properties for offset V osteotomy fixation.
• The choice of fixation may not significantly impact biomechanical performance in this specific osteotomy model.
• Further clinical studies may be warranted to correlate these biomechanical findings with patient outcomes.