Abstract
Fracture correction is important orthopedics operation and can be performed by unilateral external fixator. Due to pin deviations being inevitable during the operation, searching the impacts of pin deviation on the fracture correction and fixator joint adjustment are important. This study puts forward evaluation index with sensitivity analysis for investigating the impact of three orientation deviations and three position deviations on fracture correction. Meanwhile, based on a clinical case from a 28-year-old female, the influence of pin deviation on the adjustment of fixator joints was analyzed by inverse kinematic method. Different pin deviations have different sensitivity; the sensitivity of orientation deviation is relatively larger than position deviation. The existence of pin deviation will result in the change of the adjustment value of fixator joints. In addition, the experiments of seven situations were established to verify the analytical results. This study revealed the sensitivity of different pin deviations which can also be used to predict the adjustment value of fixator joints and the accuracy of fracture correction. This research also helps to reduce operation time and decrease damage to soft tissue by reducing the frequency of inserting pins.
Highlights
Bone fracture is becoming a very prominent research topic mainly due to aging of population and traffic accident [1]
The pins with different position deviations and orientation deviation will affect the accuracy of fracture correction
The aim of this study was, based on a clinical case, to discuss the effect of different pin deviations on fracture correction through sensitivity analysis method, through this study where pin deviation that has the greatest impact on fracture dislocation can be found
Summary
Bone fracture is becoming a very prominent research topic mainly due to aging of population and traffic accident [1]. Fracture reduction is usually performed in orthopedics doctors to ensure that fractured bones were restored to their original location. Regulating the rotational and translational joints of the fixator is usually necessary to reduce fracture and correct complex deformities [9, 10]. The procedure of inserting pins into bone is usually performed artificially before an external fixator is applied for reduction. Pins are inserted perpendicular to the bone and the fixator is applied in neutral or straight position [11]. In the actual situation, the existence of pin deviations is inevitable and it is difficult to insert the pins into the bone accurately and appropriately as ideal situation. If orthopedic surgeon knows how the pin deviation affects fracture correction and the fixator joint regulation rule, they will be very skilled using external fixator. If surgeons had more freedom to better arrange the pinbone relationship and were not distracted to the subsequent reduction again, the quality of operation would be greatly improved
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