Anterior Cruciate Ligament (ACL) rupture is one of the most common sport injuries [1]. While the importance of the cruciate ligaments for stabilization of the knee in anteroposterior (AP) direction is evident, their influence on rotational knee stability is still discussed controversially, especially since the doublebundle technique for ACL replacement claims the advantage of improved rotationa...

Micromilling process is used for fabrication and manufacturing of miniaturized components. Very high spindle rotational speeds are required in micromilling to reduce the chip load and to counter the low flexural rigidity of the micro-tool while machining hard materials. Apart from the high rotational speed (>100,000 rpm) which can excite dynamic instability, the dynamic force variation in micro...

A hybrid-kinetic model (Vlasov ions and cold-fluid electrons) is used to develop a fully nonlocal theory of the mirror-drift-cone instability. The stability analysis assumes electrostatic flute perturbations about a 0 cylindrical ion equilibrium f (HwiPe, v ), where w = const.=angular velocity of mean rotation. The radial eigenvalue equation for the potential amplitude $(r) is solved 0 exactly ...

BACKGROUND AND PURPOSE Under physiological loads, debonded cemented femoral stems have been shown to move within their cement mantle and generate a fluid pump that may facilitate peri-prosthetic osteolysis by pressurizing fluid and circulating wear debris. The long-term physiological loading of rough and polished tapered stems in vitro has shown differences in performance, with greater interfac...

BACKGROUND It is possible that gait abnormalities may play a role in the pathogenesis of meniscal or chondral injury as well as osteoarthritis of the knee in patients with anterior cruciate ligament deficiency. HYPOTHESIS The three-dimensional kinematics of anterior cruciate ligament-deficient knees are changed even during low-stress activities, such as walking, but can be restored by reconst...

Accurate femoral tunnel placement is a crucial step in Anterior Cruciate Ligament (ACL) reconstruction and non-anatomical of the may result rotational instability. With advancements arthroscopic techniques to achieve better stability, has changed from transtibial technique transportal method. Identification ACL footprint foremost during drilling. In this technical note, we describe an easy way ...

• Dynamics of Sheared Granular Fluid Meheboob Alam In first part of this talk, I will briefly review the dynamics of sheared granular fluid, focusing on instabilities, patterns and bifurcations in plane shear flow. It is shown that a universal criterion holds for the onset of the shear-banding instability (for perturbations having no variation along the stream-wise direction), that lead to shea...

PURPOSE Instability of the knee is a common finding in patients with congenital limb deficiency. The instability can be attributed to soft tissue abnormalities, frontal, sagittal or rotational deformity of the lower limb and bony dysplasia of the patella or of the femoral condyles. In most of the cases, these pathomorphologic changes stay asymptomatic in daily activity. However, instability can...