Eclipse stemless shoulder prosthesis vs. Univers II shoulder prosthesis: a multicenter, prospective randomized controlled trial.

Background: Total shoulder arthroplasty is an accepted treatment for glenohumeral osteoarthritis. The Arthrex Eclipse shoulder prosthesis is a stemless, canal-sparing humeral prosthesis with bone ingrowth capacity on the trunnion, as well as through the fenestrated hollow screw, that provides both diaphyseal and metaphyseal load sharing and fixation.

Methods: Between 2013 and 2018, 16 sites in the United States enrolled 327 patients (Eclipse in 237 and Arthrex Univers II in 90).

Biomechanical Analysis of Superior and Anterior Precontoured Plate Fixation Techniques for Neer Type II-A Clavicle Fractures.

Objective: There are limited biomechanical data supporting the use of anterior or superior-lateral precontoured clavicle plates for the treatment of displaced Neer type II-A clavicle fractures. The objectives of this study were as follows: (a) compare noncontoured versus precontoured superior plating; (b) compare use of locking versus nonlocking screws in the lateral fragment for superior precontoured plates; and (c) compare superior versus anterior precontoured plates with locking lateral fragment screws.

Methods: The following constructs were tested on a synthetic clavicle model simulating a Neer type II-A fracture: (a) superior precontoured plate with locking (SUP-L, n = 6); (b) superior precontoured plate with nonlocking (SUP-NL, n = 8); (c) anterior precontoured plate with locking (ANT-L, n = 7); and (d) superior noncontoured locking compression plate (SUP-LCP, n = 6).

In vitro assessment of phthalate acid esters-trypsin complex formation.

In this work, interactions of three phthalate acid esters (PAEs), including dimethyl phthalate (DMP), diethyl phthalate (DEP) and dibutyl phthalate (DBP), with trypsin have been studied in vitro, under simulated physiological conditions using multi-spectroscopic techniques and molecular modeling. The results show that these PAEs can bind to the trypsin, forming trypsin-PAEs complexes, mainly via hydrophobic interactions, with the affinity order of DMP > DEP > DBP. Binding to the PAEs is found to result in molecular deformation of trypsin.

The outcome of examination (manipulation) under anesthesia on the stiff elbow after surgical contracture release.

Hypothesis: We have used a technique of elbow examination under anesthesia in select patients after surgical release to assess the smoothness of the articulation, evaluate stability, and to stretch the flexion and rotation arcs.

Materials And Methods: The study comprised 51 consecutive patients who underwent an examination under anesthesia between January of 1996 and December of 2001.

Results: The examination occurred a mean of 40 days after surgery.

The effect of cartilage-derived morphogenetic protein 2 on initial healing of a rotator cuff defect in a rat model.

This animal study evaluated the healing of supraspinatus tendon tears by use of a cartilage-derived morphogenetic protein 2 growth factor (CDMP-2) delivered to the repair. Forty-eight rats had bilateral, surgically created complete tears repaired by sutures with the growth factor introduced on one side. They were killed at 2, 3, 4, and 6 weeks, and the strength of the repairs was determined and histologic analysis performed.

Triceps insufficiency following total elbow arthroplasty.

Background: Over the past decade, the indications for total elbow arthroplasty have increased. One complication that is well recognized but is poorly described in the literature is insufficiency of the extensor mechanism involving complete or partial rupture, or avulsion, of the triceps tendon. We therefore reviewed the records of patients who had undergone surgery for the treatment of triceps insufficiency following total elbow arthroplasty to determine the management options and outcomes of intervention for this problem.

Revision anterior shoulder repair for recurrent anterior glenohumeral instability.

Although the operative management of recurrent anterior glenohumeral instability has received significant attention in literature, the outcome of revision anterior shoulder repair is much less frequently reported. We report the results of our experience with this challenging problem. Retrospective chart review identified 29 patients who underwent revision anterior shoulder repair.

Recurrent anterior glenohumeral instability with onset after forty years of age: the role of the anterior mechanism.

Recurrent instability in patients over forty years of age is felt to occur primarily as a result of an associated rotator cuff tear. This is often referred to as the "posterior mechanism." We reviewed our patients over the age of forty who underwent an anterior shoulder repair to identify the incidence of capsulolabral detachments and the role of an "anterior mechanism" in this patient population.