Hamstring Tendon Autograft Is Associated With Increased Knee Valgus Moment After Anterior Cruciate Ligament Reconstruction: A Biomechanical Analysis.

Background: There is limited evidence related to the effects of autograft type on functional performance after anterior cruciate ligament reconstruction (ACLR).

Purpose/hypothesis: This study aimed to compare biomechanical outcomes during a drop vertical jump (DVJ) between patients with a hamstring tendon (HT) autograft, quadriceps tendon (QT) autograft with bone block, QT autograft without bone block, and bone-patellar tendon-bone autograft at 6 months postoperatively in an adolescent population. The authors' hypothesized there would be differences in DVJ biomechanics between athletes depending on the type of autograft used.

Biomechanical Gender Differences in the Uninjured Extremity After Anterior Cruciate Ligament Reconstruction in Adolescent Athletes: A Retrospective Motion Analysis Study.

Introduction Subsequent anterior cruciate ligament (ACL) injury is more common in the pediatric population and encompasses graft failure and subsequent contralateral tears. Females are at a higher risk. The purpose of the present study was to compare the knee valgus angles at initial contact, knee extension moments, anterior and lateral knee joint forces, hip flexion angles, hip adduction moments, and ankle inversion during the drop vertical test in the uninjured extremity between adolescent males and females who had previously undergone an anterior cruciate ligament reconstruction (ACLR).

Shoulder Synovial Chondromatosis in an Adolescent Athlete: A Case Report.

Introduction: Synovial chondromatosis refers to a benign proliferative disease of the synovium. Reports in children are rare and reports involving the pediatric shoulder are even more rare. In this review of the literature and case report, we provide a summary of all published cases in children and a report of a case of shoulder synovial chondromatosis in an adolescent female athlete.

Strength training recommendations for the young athlete.

In recent years there has been a significant increase in the number of youth participating in organized and competitive sports. Recent studies have supported the participation of preadolescent athletes in strength training to improve health and performance in sports. This article presents the most recent data available to help youth develop a safe and effective strength training program.

Pheromone binding by polymorphic mouse major urinary proteins.

Mouse major urinary proteins (MUPs) have been proposed to play a role in regulating the release and capture of pheromones. Here, we report affinity measurements of five recombinant urinary MUP isoforms (MUPs-I, II, VII, VIII, and IX) and one recombinant nasal isoform (MUP-IV) for each of three pheromonal ligands, (+/-)-2-sec-butyl-4,5-dihydrothiazole (SBT), 6-hydroxy-6-methyl-3-heptanone (HMH), and (+/-)dehydro-exo-brevicomin (DHB). Dissociation constants for all MUP-pheromone pairs were determined by isothermal titration calorimetry, and data for SBT were corroborated by measurements of intrinsic protein fluorescence.

Macromolecular assembly of the transition state regulator AbrB in its unbound and complexed states probed by microelectrospray ionization mass spectrometry.

The Bacillus subtilis global transition-state regulator AbrB specifically recognizes over 60 different DNA regulatory regions of genes expressed during cellular response to suboptimal environments. Most interestingly the DNA regions recognized by AbrB share no obvious consensus base sequence. To more clearly understand the functional aspects of AbrB activity, microelectrospray ionization mass spectrometry has been employed to resolve the macromolecular assembly of unbound and DNA-bound AbrB.