Large aortic pseudoaneurysm after fusion surgery for hyperextension-type lumbar fracture in diffuse idiopathic skeletal hyperostosis: illustrative case.

Background: This study aimed to report an aortic pseudoaneurysm, a rare but lethal complication, after a spinal fracture in ankylosing spine.

Observations: An 83-year-old obese woman presented with dementia and was nonambulatory after a fall. She was transported to the hospital, and imaging showed a hyperextension-type L1 fracture with diffuse idiopathic skeletal hyperostosis (DISH).

Dynamics of surgical smoke in the operating room during spinal surgery: Comparison of particulate matter 2.5-air concentration between the electric scalpel with and without a smoke evacuation pencil: A cross-sectional study.

Background: Surgical smoke is a vaporous by-product generated during tissue incision and cauterization with an electric scalpel. This smoke contains tissue- and blood/vascular-derived substances, bacteria, viruses, and chemical substances. Among them, it contains many fine particles called particulate matter (PM) 2.

Neoadjuvant teriparatide therapy targeting the osteoporotic spine: influence of administration period from the perspective of bone histomorphometry.

Objective: Teriparatide (TPTD) is a potent promoter of early-stage osteogenesis and may be a useful adjuvant therapy to reduce complications related to bone fragility in spinal surgery patients with osteoporosis. However, effective neoadjuvant TPTD therapy regimens remain poorly understood. This study aimed to examine the effect of preoperative TPTD administration on cancellous bone with bone histomorphometry and to clarify the timing of preoperative TPTD administration for patients with spinal fusion and osteoporosis.

Rib Hyperostosis as a Risk Factor for Poor Prognosis in Cervical Spine Injury Patients With Diffuse Idiopathic Skeletal Hyperostosis.

Study Design: Retrospective multi-center study.

Objective: To identify the morphological features of costovertebral joints and ribs in surgically managed cervical injury patients with diffuse idiopathic skeletal hyperostosis (DISH) and to examine its impact on their vital prognosis.

Summary Of Background Data: Several reports have indicated that DISH is an independent risk factor for mortality after spinal fracture.

Clinicopathological features of lipomas with gene fusions involving HMGA2.

Background: Despite accumulating knowledge of chimeric genes derived from fusion of the HMGA2 gene with multiple partners in lipomas, the different clinicopathological features of lipomas depending on different gene aberrations have not been well documented. The purpose of this study was to examine the clinical significance of the expression of fusion genes in lipomas.

Patients And Methods: The expressions of three previously reported gene fusion transcripts, including HMGA2/LPP, HMGA2/RDC1 and HMGA2/NFIB, were analyzed in 102 tumors from patients with lipomas.

Focal lymphoid hyperplasia in a lipoma, mimicking liposarcoma.

Lipomas may contain nonadipose tissue, which can confound the correct imaging diagnosis because features of such neoplasms can mimic findings associated with well-differentiated liposarcomas. Intratumoral nonadipose tissue, such as muscle, cartilage, and fibrous tissue, may be present in lipomas; however, lymphoid hyperplasia in a lipoma is extremely rare. This report describes a case involving a heterogeneous lipoma in a 55-year-old woman in whom the heterogeneous portion of the tumor was in fact a reactive lymphoid hyperplasia encased by the lipoma.

Contact pressure in anterior cruciate ligament bone tunnels: comparison of endoscopic and two-incision technique.

Purpose: To investigate differences in contact pressure in the bone tunnel between the inside-out and outside-in techniques used for anterior cruciate ligament reconstruction.

Type Of Study: In vitro cadaveric analysis.

Methods: Four fresh-frozen cadaver knees were tested.

Pathological fracture of the femur ten years after successful radiation therapy for metastatic breast cancer.

We describe a case involving a 75-year-old woman presenting with a femur fracture 10 years after radiation therapy for metastatic breast cancer, which developed in the right femur. The lesion showed complete response with bone healing following radiation therapy; however, the patient sustained a femur fracture ten years later. Histological examination of the specimens obtained from the lesion revealed features of radiation osteonecrosis, but there was no histological evidence of tumor.

MR imaging findings of an unusual case of myositis ossificans presenting as a progressive mass with features of fluid-fluid level.

We present a case of myositis ossificans involving the upper arm in which features of fluid-fluid level became apparent on magnetic resonance imaging (MRI). Serial MR images obtained over a 6-month period exhibited progressive appearances in the absence of dense mineralization in the early and mid phases, which simulate neoplastic conditions. Twenty-four weeks following the biopsy, MR images revealed that the mass had decreased in size with the disappearance of most of the features of fluid-fluid level.

Properties of the tibial component regarding impact load.

Load transmission through knee prostheses was examined to clarify how the tibial component behaves under dynamic loading conditions. We did Genesis II total knee arthroplasty using sawbones and measured impact load transmission ratios using the split-Hopkinson pressure bar technique. We also measured the polyethylene strain when an impact load was applied using a strain gauge bonded to the anterior surface of the polyethylene.

Extraskeletal osteosarcoma of the jaw.

Extraskeletal osteosarcoma is a rare malignancy, which accounts for 1-2% of all soft tissue sarcomas; occurrence of these tumors in the head and neck is extremely rare. We present a case of extraskeletal osteosarcoma arising in the subcutaneous tissue of the jaw angle, the central portion of which displayed calcification. Imaging findings were interesting in terms of a high grade malignancy in that the tumor was small and well circumscribed; its appearance mimicked a calcified lymph node.

Influence of the femoral tunnel location and angle on the contact pressure in the femoral tunnel in anterior cruciate ligament reconstruction.

Background: The causes of bone tunnel enlargement after anterior cruciate ligament reconstruction have not been thoroughly investigated.

Hypothesis: A malpositioned femoral tunnel and an acute femoral tunnel angle may increase the mechanical stress in the femoral tunnel.

Study Design: Controlled laboratory study.

Intraoperative measurements of knee motion in total knee arthroplasty.

A photostereometric technology-based knee motion analysis system was developed and intraoperative kinematics during total knee arthroplasty (TKA) was investigated. Ten knees were evaluated and two different types of posterior-cruciate-retaining TKA (Genesis-I and Genesis-II) were used. Both TKA showed posterior translation of the medial and lateral femoral condyle with knee flexion.

Rotational muscle strength of the limb after anterior cruciate ligament reconstruction using semitendinosus and gracilis tendon.

Purpose: To investigate the influence of harvesting semitendinosus and gracilis tendons on the rotational muscle strength of the limb after anterior cruciate ligament (ACL) reconstruction.

Type Of Study: Prospective study.

Methods: We performed a prospective study of 62 consecutive (34 male, 28 female) patients with ACL reconstructions using the semitendinosus and gracilis tendons.