A Biomechanical and Structural Comparison of Articular Cartilage and Subchondral Bone of the Glenoid and Humeral Head.

Background: The underlying cause of glenohumeral arthritis is poorly understood. Glenohumeral arthrosis patterns have been classified and described, and differential contact stresses within the joint have been implicated as a cause of joint degeneration, but the intrinsic cause of degeneration patterns in the glenohumeral joint (GHJ) remains largely unknown.

Purpose/hypothesis: The purpose of this study was to assess morphological and mechanical differences in articular cartilage (AC) and subchondral bone (SCB) of the glenoid and humeral head in matched cadaveric specimens.

Evaluation and treatment of failed shoulder instability procedures.

Management of the unstable shoulder after a failed stabilization procedure can be difficult and challenging. Detailed understanding of the native shoulder anatomy, including its static and dynamic restraints, is necessary for determining the patient's primary pathology. In addition, evaluation of the patient's history, physical exam, and imaging is important for identifying the cause for failure after the initial procedure.

WITHDRAWN: Stemless humeral component in total shoulder arthroplasty: 2-year age-related clinical outcomes.

This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.

Rotator cuff rehabilitation: current theories and practice.

A fully functioning, painless shoulder joint is essential to maintain a healthy, normal quality of life. Disease of the rotator cuff tendons (RCTs) is a common issue that affects the population, increasing with age, and can lead to significant disability and social and health costs. RCT injuries can affect younger, healthy patients and the elderly alike, and may be the result of trauma or occur as a result of chronic degeneration.

Long head biceps tenodesis with a knotless cinch suture anchor: a biomechanical analysis.

Purpose: The purpose of this study was to evaluate the initial fixation strength of 3 techniques of arthroscopic tenodesis of the long head of the biceps (LHB).

Methods: Eighteen human cadaveric shoulders were randomly assigned to one of 3 simulated arthroscopic biceps tenodesis techniques-simple suture (SS), Krakow stitch (KS), or lasso loop (LL)-combined with a knotless fixation implant (3.5-mm Piton Anchor; Tornier, Minneapolis, MN).

Eikenella corrodens septic hip arthritis in a healthy adult treated with arthroscopic irrigation and debridement.

We present the case of a seemingly spontaneous septic hip arthritis in a patient with no pertinent medical history. Our patient presented with persistent and worsening sharp lower back pain and underwent arthrocentesis of the hip joint, yielding purulent fluid positive for Eikenella corrodens. Our patient's treatment consisted of arthroscopic irrigation with debridement and limited synovectomy that used a supine 2-incision technique.

The global percutaneous shuttling technique tip for arthroscopic rotator cuff repair.

Most arthroscopic rotator cuff repairs utilize suture passing devices placed through arthroscopic cannulas. These devices are limited by the size of the passing device where the suture is passed through the tendon. An alternative technique has been used in the senior author's practice for the past ten years, where sutures are placed through the rotator cuff tendon using percutaneous passing devices.

Gluteus medius strengthening and the use of the Donatelli Drop Leg Test in the athlete.

Objectives: To evaluate and strengthen the posterior segment of the gluteus medius.

Design: A technical description of a novel examination and rehabilitation protocol.

Setting: The gluteus medius, primarily a hip abductor, serves several important functions in the athlete.

Osteosarcoma cells differentiate into phenotypes from all three dermal layers.

Background: Osteosarcomas are the most common solid malignant bone tumors, but little is known of their origin. The embryonal rest hypothesis views cancer cells as arising from committed progenitor stem cells in each tissue. Adult tissue contains primitive stem cells that retain the ability to differentiate across dermal lines, raising the possibility that the stem cell of origin of cancers may be from a more primitive stem cell than a progenitor.