Forces acting on the clavicle during shoulder abduction, forward humeral flexion and activities of daily living.

Background: The forces acting on the human clavicle in vivo are difficult if not impossible to measure. The goal of this study is to quantify the forces acting on the human clavicle during shoulder abduction, forward humeral elevation and three activities of daily living using the Delft Shoulder and Elbow Model.

Methods: The Delft Shoulder and Elbow Model and a computed tomography scan of a clavicle were used to calculate the forces and moments acting on the entire clavicle and on three planes within the middle third of the clavicle during the simulated movements.

Initial promising results of the dynamic locking blade plate, a new implant for the fixation of intracapsular hip fractures: results of a pilot study.

Introduction: The osteosynthesis of intracapsular hip fractures results in a 19-48% failure rate. Only when the anatomical reduction is secured by stable fixation, revascularisation of the femoral head can take place and the fracture can heal by primary osteonal reconstruction. The common implants lack rotational and/or angular stability.

Biomechanical evaluation of the vertebral jack tool and the inflatable bone tamp for reduction of osteoporotic spine fractures.

Study Design: Controlled in vitro study.

Objective: To compare two kyphoplasty techniques in cadaveric fractured vertebrae: an experimental vertebral jack tool (VJT) and an inflatable bone tamp (IBT).

Summary Of Background Data: A previous biomechanical study showed restored strength and stiffness after height restoration in cadaveric-fractured osteoporotic vertebrae using a new device for reduction of osteoporotic vertebral fractures.

Design of a rotational hydroelastic actuator for a powered exoskeleton for upper limb rehabilitation.

The goal of this study was to validate the suitability of a novel rotational hydroelastic actuator (rHEA) for use in our new rehabilitation exoskeleton for the upper limbs, the Limpact. The rHEA consists of a rotational hydraulic actuator and a custom-designed symmetric torsion spring in a series-elastic configuration. For rehabilitation therapy and impairment quantification, both compliant impedance control and stiff admittance control modes are possible.

The dynamic locking blade plate, a new implant for intracapsular hip fractures: biomechanical comparison with the sliding hip screw and Twin Hook.

Internal fixation of intracapsular hip fractures results in a high failure rate with non-union and avascular necrosis being the two most important complications. In order to prevent these possible complications treatment should consist of an anatomical reduction and stable fixation by insertion of a low volume, dynamic implant, providing angular and rotational stability to the femoral head. According to these principles a new implant, the dynamic locking blade plate (DLBP) was designed for the fixation of intracapsular hip fractures.

The influence of endplate-to-endplate cement augmentation on vertebral strength and stiffness in vertebroplasty.

Study Design: Controlled in vitro trial.

Objective: To study vertebral strength in relation to cement augmentation technique after vertebroplasty and to assess the influence of the biomechanical compression model on postoperative results.

Summary Of Background Data: In the treatment of osteoporotic vertebral fractures, the role of vertebroplasty has been well established.

Design of an intramedullary leg lengthening device with a shape memory actuator.

The procedure and the external fixator for lengthening long bones was developed by G.A. Ilizarov in the late 1960's.