K-line tilt as a novel radiographic parameter in cervical sagittal alignment.

Objective: To investigate the relationship between the K-line tilt and classical cervical parameters such as the C2-C7 sagittal vertical axis (SVA), cervical lordosis, and the T1 slope in cervical sagittal alignment. We assessed whether the K-line tilt can be used as an excellent cervical parameter.

Methods: We reviewed 50 patients aged 60-89 years who visited the spine center outpatient clinic from May 2017 to September 2017 through cervical spine lateral radiography and checked the cervical spine parameters.

Role of hyaluronic acid and phospholipid in the lubrication of a cobalt-chromium head for total hip arthroplasty.

The tribological performance of total hip arthroplasty has an important influence on its success rate. This study examined the concentration-dependent role of hyaluronic acid (HA) and phospholipid (dipalmitoylphosphatidylcholine, DPPC) in the boundary lubricating ability of retrieved cobalt-chromium femoral heads. The microscale frictional coefficients (μ) were measured by atomic force microscopy using a rectangular silicon cantilever integrated with sharp silicon tips.

Anatomic medial patellofemoral ligament reconstruction using patellar suture anchor fixation for recurrent patellar instability.

Purpose: The purpose of this study was to prospectively evaluate clinical and radiographic outcomes following anatomic medial patellofemoral ligament (MPFL) reconstruction using patellar suture anchor fixation for recurrent patellar instability.

Methods: Twenty patients (20 knees) were enrolled in this study. The median age was 21 years, and the median follow-up was 34.

Changes in the length of the medial patellofemoral ligament: an in vivo analysis using 3-dimensional computed tomography.

Background: The ideal points for medial patellofemoral ligament (MPFL) reconstruction have not been precisely defined.

Purpose: To determine at which flexion angles the grafts should be fixed to best restore patellar stability as well as to compare the length change of various femoral and patellar fixation sites for current MPFL reconstruction during knee flexion in vivo.

Study Design: Descriptive laboratory study.

Anterior knee pain after tibial intramedullary nailing using a medial paratendinous approach.

Objectives: To determine the incidence, severity, and etiology of anterior knee pain after tibial intramedullary (IM) nailing using a medial paratendinous approach and to investigate the association between anterior knee pain and functional impairment.

Design: Retrospective study with current clinical and radiographic assessments.

Setting: Level I trauma center.