Accuracy of digital radiography measurement using reference gauge compared with Vernier Calipers in patients with hip replacement and knee replacement

Abstract

                 This research is a study of the development of routine work towards research on the accuracy of radiographic bone measurements using the reference scale scale Compared to actual bone measurements with Vernier Caliper in hip and total knee replacement surgery patients. In Chao Phraya Yommarat Hospital, the objective of 1.To study the accuracy of digital radiograph bone measurements using the reference scale scale compared with vernier caliper measurements. From real bones during surgery 2.To assess the opinions of orthopedic surgeons on the use of reference gauges In the adjustment of the magnification of the image Reduce workflows, cost overview, use of digital radiographic reference gauge scale

                   The research period was from October 2017 to September 2018. Population and sample used were hip arthroplasty patients. And artificial knee joints at the orthopedic surgeon department, send radiographs for Hip joint or Knee joint with scale at the radiology group. Chao Phraya Yommarat Hospital: The criteria for elimination were patients who voluntarily use the device created by the researcher. Study Method 1. Design tools and equipment. Build equipment And measure the accuracy of the gauge scale The device has two components, the first is the base structure and the axial handle, the scale can be adjusted both horizontally and vertically by moving it up and down and both as required. Use a round stainless steel with a diameter of 2 mm and a length of 100 mm by measuring the accuracy of the length measurement with a Vernier High Grate 2. Test the device before using it. By using a digital radiographic reference scale reference scale on a known object with a simulation device to take a virtual digital radiography. Compare the measurement of the object size, from the calculation and measurement using the reference gauge scale, the results of the comparison of the actual object size with the calculation results. And measurement results from the reference meter scale The results were analyzed with a difference of 0.01 cm and applied to real patients.

Conclusion and analysis of the study found that

                 Comparison of knee replacement results (Each size difference at 3 mm), 65 patients before surgery, 31 cases of radiographs and real bone ≤ 3 mm, accounted for 47.69%. % But compared to 32 cases after surgery, the results from radiographs with real bone ≤ 3 mm number 30, accounting for 93.75%. The radiographs with real bone 3 mm or more amounted to 2 cases, representing 6.25%. With a deviation greater than 3 mm in 52.31% of the patients before knee arthroscopy, caused by the surgeon cut off 8-10 mm of worn bone and osteophyte, depending on the lesion and severity of the patient Per bone measurement position Compared with the effect of postoperative, which had the difference at The value from radiography with 1 mm of real bone were 2 cases, equivalent to 6.25%.

A comparison of 12 hip replacement (each size is different at 1 mm) before surgery. The results from radiographic imaging and real bones were not different in 4 cases, representing 33.33%. Radiographic imaging and real bone differences were 1. 7 patients, 58.33%. The radiographic value of 2 mm of real bone, 1 case, accounted for 8.34%, but compared to 6 cases after surgery. There was no difference in the number of 4 cases, 66.67%. The radiographic value of 2 mm true bone was 33.33%. Obesity affects the determination of the position of the greater trochanter.