Application of elliptic registration and three-dimensional reconstruction in the postoperative measurement of Taylor spatial frame parameters

Abstract

Background: The Taylor spatial frame offered the ability of simultaneous correction of the multidirectional deformities without the need to change the frame, and it was widely used for limb lengthening, deformity correction, and fracture reduction in recent years. There are still some inherent limitations that can affect the accuracy of correction, especially for the measurement of the mounting and rotational parameters. The purpose of our study was to propose some more precise postoperative measurement of Taylor spatial frame (TSF) parameters by application of elliptic registration and three-dimensional reconstruction. Methods: This retrospectively study included 28 trauma patients who suffered tibial fracture treated by the TSF at our institution from January 2016 to January 2018, including 25 males and 3 females with a mean age of 43 years (range 14-70 years). We conducted standard full-length anteroposterior and lateral X-rays of the injured extremity and the computed tomographic scans of the bilateral extremities after the operation. Elliptic registration and 3D reconstruction were used to calculate the parameters by two types of software Mimics and CorelDRAW. Correction of the deformity was conducted by adjusting the struts of the TSF according to the electronic prescription. The standard anteroposterior and lateral X-rays after correction were taken to evaluate the effectiveness. Results: All patients acquired functional reduction, which was evaluated by digital radiography. The mean coronal plane translation(1.9 ±2.2 mm), coronal plane angulation(1.2 ±1.0 °), sagittal plane translation(2.7 ±2.1 mm), and sagittal plane angulation(1.2 ±1.0 °) after correction were all less than those(5.5 ±4.6 mm, 4.9 ±3.9 °, 4.7 ±4.0 mm, 2.7 ±2.3 °) before correction. Conclusions: The TSF system can correct the 6-axis deformities simultaneously with the accurate parameters. Elliptic registration and three-dimensional reconstruction are alternative methods to precisely measure the parameters needed by the TSF system, especially for the mounting and rotational parameters of unusually complex cases.

Intraoperative acute correction versus postoperative gradual correction for tibial shaft fractures with multiplanar posttraumatic deformities using the hexapod external fixator

“…Furthermore, even subtle errors in the parameters can be showed as malcorrection, unexpected translation-angulation, or insu cient correction. In the previously published data, various methods had been proposed to improve the correction accuracy, including intraoperative uoroscopy, postoperative radiography, and CT scans 13,[20][21][22][23][24] .…”

“…Wright et al 25 also developed a silhouette technique to obtain adequate orthogonal imaging and reduce the repeated radiograph requirement. Liu et al 24 combined the elliptic registration technique and three-dimensional reconstruction to precisely measure the parameters. All the aforementioned methods are contributed to the accurate parameter measurement, they focused solely on the deformity correction itself, and none compared the clinical outcomes of intraoperative acute correction versus postoperative gradual correction.…”

Intraoperative acute correction versus postoperative gradual correction for tibial shaft fractures with multiplanar posttraumatic deformities using the hexapod external fixator

“…Furthermore, even subtle errors in the parameters can be showed as malcorrection, unexpected translation-angulation, or insufficient correction. In the previously published data, various methods have been proposed to improve the correction accuracy, including intraoperative fluoroscopy, postoperative radiography, and CT scans [ 14 , 20 - 24 ].…”

“…Wright et al [ 25 ] also developed a silhouette technique to obtain adequate orthogonal imaging and reduce the repeated radiograph requirement. Liu et al [ 24 ] combined the elliptic registration technique and three-dimensional reconstruction to precisely measure the parameters.…”

Staged correction trajectory with hexapod external fixator for the satisfactory reduction of acute long bone shaft fracture

“…Malcorrection, insu cient correction, or unexpected translation-angulation can be presented by subtle errors in the parameter de nition. Lots of previously published methods have been described to improve parameter accuracy, including CT scans, intraoperative uoroscopy, postoperative radiography, and determination of the radiographs' orthogonality 15,[23][24][25][26][27][28][29] .…”