Sex-based differences in neck selectivity in total hip arthroplasty using a modular femoral neck system.

Background: Dislocation is a major complication of total hip arthroplasty (THA). The modular femoral neck system provides practical advantages by allowing adjustment of neck version and length in the presence of intraoperative instability. Anatomical studies have identified morphological differences in the hip joint between men and women.

Comparison of facet fusion rates and clinical outcomes between cortical bone trajectory screw and percutaneous pedicle screw fixation for degenerative lumbar spondylolisthesis.

Background Context: Cortical bone trajectory (CBT) screws have been introduced as an alternative technique for pedicle screw (PS) insertion because they have greater contact with the cortex and a greater uniaxial pullout load than traditional PS. CBT screwing can also minimize muscle dissection. However, CBT screws and traditional PSs have not yet been compared in terms of fusion rates and clinical outcomes for particular operative procedures.

Quantitative evaluation of the lumbar ligamentum flavum using MRI T2-mapping: Efficacy of its clinical application in patients with lumbar spinal stenosis.

Obejective: To perform a magnetic resonance imaging T2-mapping of the ligamentum flavum in healthy individuals and patients with lumbar spinal stenosis scheduled for surgery and compare the T2 relaxation times.

Subjects And Methods: The T2 relaxation time of the ligamentum flavum was compared among 3 groups, healthy young individuals (H group (age< 50)), healthy middle-aged and older individuals (H group (age≥50)), and patients with lumbar spinal stenosis (L group). Additionally, the thickness of the ligament was measured in the axial image plane, and the occupied area ratio of each fiber was measured by staining the surgically obtained ligament, and each was correlated with the T2 relaxation time.

Efficacy and Safety of Condoliase Disc Administration as a New Treatment for Lumbar Disc Herniation.

Introduction: Condoliase is a newly approved drug that improves symptoms associated with lumbar disk herniation (LDH) by intradiscal administration. This study aimed to evaluate the mid-term outcomes of condoliase injection, examine the adverse events, including cases that required surgery after condoliase administration, and verify cases in which condoliase could be effective.

Methods: We enrolled patients with LDH who were treated conservatively for at least six weeks and received condoliase.

Good 5-year postoperative outcomes after facet fusion using a percutaneous pedicle screw system for degenerative lumbar spondylolisthesis.

Many authors have reported no significant differences in clinical outcomes between posterolateral fusion (PLF) and interbody fusion, as well as satisfactory long-term outcomes after PLF. Facet fusion (FF), a minimally invasive evolution of PLF, has also resulted in good clinical outcomes. This study aimed to assess the clinical outcomes 5 years after FF for degenerative lumbar spondylolisthesis (DLS) and determine whether good clinical outcomes were maintained after FF.

Good clinical outcomes in nonunion cases after facet fusion with a percutaneous pedicle screw system for degenerative lumbar spondylolisthesis.

There are many satisfactory long-term outcomes after posterolateral fusion (PLF) for degenerative lumbar spondylolisthesis (DLS); nonunion cases have also achieved good clinical outcomes. Facet fusion (FF), a minimally invasive evolution of PLF, also resulted in good clinical outcomes. We aimed to assess the course of nonunion cases after FF and determine whether the nonunion cases achieved good clinical outcomes.

Osteointegration of a Biocomposite Suture Anchor After Arthroscopic Shoulder Labral Repair.

Purpose: To evaluate osteoconductivity of a poly-L-lactide co-glycolide (PLG)-calcium sulfate (CS)-β-tricalcium phosphate (β-TCP) biocomposite suture anchor after arthroscopic shoulder labral repair.

Methods: The subjects of this study were patients who participated in a clinical trial for acquisition of marketing approval of a PLG-CS-β-TCP biocomposite anchor in Japan. They underwent arthroscopic labral repair using the anchor, and computed tomographic (CT) images of the glenoid were obtained 2 years after surgery.

A simple formula for predicting diameter of safely inserted cortical bone trajectory screws for fixation of the lower lumbar spine.

Background: Cortical bone trajectory (CBT) screws are popular for spinal fixation, but their ideal diameter has not been determined. Studies using postoperative computed tomography (CT) have revealed ample bone marrow space around 5.5-mm screws, which are commonly used.

Tuberosity-overlapping Fixation of the Humeral Shaft in Humeral Head Replacement Surgery.

The fixation technique of bony fragments is crucial for the bone union of the tuberosities after humeral head replacement (HHR) for a comminuted fracture of the proximal humerus. To increase the bone union rate, we reduce tuberosities to overlap on the humeral shaft by approx. 1 cm and fix them with cable wire.

Pedicle screw shift without loosening following instrumented posterior fusion: limitations of pedicle screw fixation.

The disc angle at the fused segment is extended in operative prone position, but eventually returns to preoperative neutral position within 6 months to 1 year. This study aimed to assess pedicle screw (PS) shift without loosening to identify the mechanism of the change in disc angle after posterior fusion for degenerative lumbar spondylolisthesis (DLS). Sixty-three consecutive patients who underwent facet fusion for L4 single-level DLS were retrospectively reviewed using computed tomography (CT) immediately after surgery and 6 months postoperatively.

Management of Intra-Articular Distal Radius Fractures: Volar or Dorsal Locking Plate-Which Has Fewer Complications?

Background: The aim of this study was to compare the functional outcomes and complications of volar and dorsal plating for the management of intra-articular distal radius fractures, with special regard to indications for dorsal plating. Furthermore, we examine the rationale for choosing dorsal plating and its frequency of use.

Methods: Clinical assessments included range of motion measurements at the wrist; grip strength; the Quick Disabilities of the Arm, Shoulder, and Hand score; and the Gartland and Werley score.

Good clinical outcomes and fusion rate of facet fusion with a percutaneous pedicle screw system for degenerative lumbar spondylolisthesis: minimally invasive evolution of posterolateral fusion.

Study Design: A retrospective clinical and radiographical study.

Objective: To assess the clinical outcomes and fusion rate of facet fusion (FF) for degenerative lumbar spondylolisthesis (DLS).

Summary Of Background Data: On the basis of the long-term clinical and radiological follow-up studies of posterolateral fusion (PLF)-that is, intertransverse process fusion with pedicle screw instrumentation-for DLS, we recognized that FF alone would be sufficient for spinal fusion.

Relationship Between Tightness of the Hip Joint and Elbow Pain in Adolescent Baseball Players.

Background: Repetitive tensile stresses from valgus torque can induce elbow injury in adolescent baseball players. Insufficient hip range of motion (ROM) can change throwing mechanics, reducing the transfer of energy from the lower to the upper extremities. Thus, hip ROM limitations may force the upper extremities to bear the burden of a strong throw.

Advantages of arthroscopic transosseous suture repair of the rotator cuff without the use of anchors.

Background: Although arthroscopic anchor suturing is commonly used for rotator cuff repair and achieves good results, certain shortcomings remain, including difficulty with reoperation in cases of retear, anchor dislodgement, knot impingement, and financial cost. In 2005, we developed an anchorless technique for arthroscopic transosseous suture rotator cuff repair.

Description Of Technique: After acromioplasty and adequate footprint decortication, three K-wires with perforated tips are inserted through the inferior margin of the greater tuberosity into the medial edge of the footprint using a customized aiming guide.

The natural course of atraumatic shoulder instability.

Over the years, we have observed a shifting among loose shoulder, voluntary dislocation, habitual dislocation, and sustained subluxation, leading us to the conclusion that they are all varieties of the same condition: atraumatic shoulder instability. For this study, we followed the natural course of atraumatic shoulder instability in 341 patients (573 shoulders) for 3 years or more. There were 467 cases of loose shoulder, 49 cases of voluntary dislocation, 56 cases of habitual dislocation, and 1 case of sustained subluxation.