Polyga S1 Used In Measuring Bone Defect Volume

3D scanning metrology has been successfully implemented in many industries including space engineering, civil engineering, automotive, archaeology and entertainment. Applications of 3D technologies in orthopaedics are likewise increasing; use of 3D technology has been described for preoperative visualization and planning in trauma and elective orthopaedic surgery, manufacture of customized surgical tools, customized 3D printed implants, as well as production of orthoses and prosthetics. However majority of the described applications are based on preoperative CT and MRI scans and have limited intraoperative use.

The objective of this study conducted by Dr. Shahriar Seddigh of Dalhousie University is to compare volume accuracy of 3D scanner to microCT scanner for measurement of bone defects in animal tibial bone models.

Animal bone

Three bovine tibial specimens are prepared with defects for scanning.


3D Mesh reconstruction of bovine tibial specimen. Each tibial specimen was scanned at least 5 times to capture all surfaces of the bone defect and prevent line of sight errors. The scans are combined in FlexScan software and the combined point cloud is exported as stl for volume analysis in MeshMixer Software.

scan data

3D Mesh reconstruction of bovine tibial specimen as measured by Structured Light scanner (left) and by MicroCT Scanner (right).

The details below is a sample volume comparison between the two methods for Specimen:

Trial 1: 113.818 (Computed Tomography) ; 115.854 (Structured Light)

Trial 2: 122.03 (Computed Tomography) ; 121.155 (Structured Light)

Structured Light 3D scanners can accurately measure volume of bone defects in animal tibial models as compared with microCT scanners.

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