Impact of optical navigation variables on the accuracy of robot-assisted surgery: a study of the TIANJI Robot system.

This study aims to explore factors related to optical navigation that interfere with the accuracy of robot-assisted surgery, specifically focusing on the TIANJI Robot system. A measurement model was created to assess the accuracy of the TIANJI Robot system in simulated screw placement. Deviation between actual and planned positions was measured using a three-coordinate machine.

Parallel Reconstruction of Vascularized Fibula Autograft for Treatment of Complications after Resection of Malignant Tumor from the Thigh.

The authors herein introduce a modification of parallel reconstruction with a vascularized fibula autograft (VFA) for cases of femur allograft complications. Conventional parallel reconstruction, in which the fibula with its vascular pedicle is placed on the medial side of the femur and allogeneic bone, may be an effective means to solve the allograft complications. However, the limited contact area between the fibula and femur/allogeneic bone can affect the bone healing ability.

Biomechanical CT-computed bone strength predicts the risk of subsequent vertebral fracture.

Following primary fractures and percutaneous kyphoplasty (PKP), patients have a high risk of incurring a subsequent vertebral fracture (SVF). Given that SVF is a consequence of mechanical deterioration of the vertebra, we sought to examine whether vertebral strength derived from QCT-based finite element analysis (i.e.

Mechanical testing and biomechanical CT analysis to assess vertebral flexion strength of Chinese cadavers.

Biomechanical CT (BCT), i.e., quantitative computed tomography-based finite element analysis (QCT-FEA), promises an improved technique over bone mineral density (BMD) in predicting bone strength and the risk of osteoporotic vertebral fractures.

Centralization of ulna with wrist fusion for failure of reconstructed distal radius by allograft bone or prosthesis: A case report and literature review.

Rationale: Centralization of the ulna is commonly used in the treatment of radius developmental deformity in children. The secondary distal radius deficiency in adults is different from the developmental deformity of the radius in children. There is no report on the ulna centralization with wrist fusion for the failure of the reconstructed distal radius by allograft bone or prosthesis for osteosarcoma in adults.

Experimental testing and biomechanical CT analysis of Chinese cadaveric vertebrae with different modeling approaches.

Osteoporosis is characterized by reduced bone strength predisposing to an increased risk of fracture. Biomechanical computed tomography (BCT), predicting bone strength via CT-based finite element analysis (FEA), is now clinically available in the USA for diagnosing osteoporosis or assessing fracture risk. However, it has not been previously validated using a cohort of only Chinese subjects.

Prevalence of Lumbar Spondylolisthesis in Middle-Aged People in Beijing Community.

Objective: Lumbar spondylolisthesis (LS) is a common lumbar disease, and the prevalence of LS in different countries or regions was not consistent in the past. This study intends to make statistics on the prevalence of lumbar spondylolisthesis in middle-aged people in Beijing community.

Methods: This is an epidemiological study.

[Long-term clinical efficacy of cervical artificial disc replacement for cervical spondylotic radiculopathy].

Objective: To evaluate the long-term efficacy and influencing factors of cervical artificial disc replacement (CADR) for patients with cervical spondylotic radiculopathy (CSR).

Methods: The data of 29 CSR patients who underwent Bryan artificial disc replacement between December 2003 and December 2007 and followed up more than 10 years were retrospectively analysed. There were 16 males and 13 females with an average age of 54.

[Analysis of influence of shell angle of cervical artificial disc on long-term effectiveness of cervical artificial disc replacement].

Objective: To evaluate the influence of the shell angle of cervical artificial disc on long-term effectiveness of cervical artificial disc replacement (CADR).

Methods: The clinical data of 71 patients who were treated with single-level CADR with Bryan prosthesis between December 2003 and December 2007 and followed up more than 10 years, were retrospectively analyzed. There were 44 males and 27 females with an age of 26-69 years (mean, 45.