Various types of tibial alignment guides exist, the results in performing the tibial resection in total knee arthroplasty (TKA) are more or less than we desired. In addition, it is difficult to estimate the accuracy of tibial component alignment with radiograph because it is difficult to get true frontal and lateral view. In this study, we use new tibial alignment guide and estimate tibial component alignment by using postoperative CT scan. 30 knees underwent TKA using an accelerometer-based, portable navigation device (KneeAlign 2) and postoperative CT scans were obtained. Postoperative CT scans of the lower limbs analysed by 3D digital template system (Athena), demonstrated that 96.6% of the tibial components were placed within 90°± 2°to the mechanical axis in the coronal plane, and 96.6% of the components were placed within 3°± 2°to the mechanical axis in the sagittal plane. As a result of this study, an accelerometer-based, portable navigation device can expect to decrease outliers in tibial component alignment.
It is very important for implanting tibial component to prevent bearing dislocation in Oxford UKA. One of the keys is accurate rotational position of tibia. But the problem remains what is accurate rotation of tibia in UKA. Oxford Signature decided the rotation of tibia component from MRI images. We measured the component rotation of tibia using CT after operation. 14 patients were operated by Oxford Signature and 11 patients were operated by Microplasty method. Patients were examined by CT 2 or 3 weeks later after operation. We compared component axis of tibia and A-P axis by best fit circle, Akagi's line. In Oxford Signature group, component angle were 7.1 degree external rotation compared with A-P axis by best fit circle and were 3.6 degree external rotation compared with Akagi's line. In Microplasty group, component angle were 8.1 degree external rotation compared with A-P axis by best fit circle and were 3.8 degree external rotation compared with Akagi's line.Patients and Methods
Results
Biologic agents (BIO) drastically changed the rheumatoid arthritis (RA) therapy from starting to use biologics at 2003 in Japan. The rate of orthopaedic surgery, especially total joint arthroplasty (TJA) may reflect trends in disease severity, management and health outcomes. We surveyed the number and rate of orthopaedic surgeries and TJA in RA treatment with BIO in the last decade, so called BIO-era.Objectives
Methods
MISTKA resulted earlier recovery of ROM, muscle power and shorter incision. But bleeding after operation did not decrease compared with conventional TKA. We compared MISTKA results between several approach mini arthrotomy, mini midvastus and mini subvastus. There were no difference in these series. We thought extramedullary femoral guide may be less invasive than intramedullary femoral guide system. 34 cases were performed by minisubvastus approach. 17 cases were using intramedullary method. 17 cases were using extramedullary method. We compared JOA score, ROM, muscle power, blood examination, X ray, and operation time. Total protein(TP), albumin(alb), prealbumin(prealb), hemoglobin(Hb), total lymphocyte content(TLC) and CRP were examined. There was no difference in JOA score, ROM and recovery of muscle power. But there were statistically difference in prealbumine at 1 week after operation and TLC at 2 week after operation. Extramedullary group showed earlier recovery than intramedullary group. MIS TKA does not discuss about approach but also system of bone cut. Navigation system is very good method but it is very expensive and takes more time at operation. Extramedullary system we developed is simple and low technology method and useful for MISTKA.
