In vivo comparison of hip mechanics for minimally invasive versus traditional total hip arthroplasty

Is Metal-on-Metal Squeaking Related to Acetabular Angle of Inclination?

“…Squeaking also has been described for MOM prostheses used in THA, with incidences ranging from 3.7% to 16% [1,4,5]. One study of 230 patients, who had large-head MOM hip resurfacing, noted nine patients (3.9%) experienced transient squeaking [1].…”

“…A study of sound emissions of a total hip prosthesis under in vivo conditions showed all patients with a MOM THA experienced squeaking [4]. This study amplified sound from the hip using a microphone at the hip-joint interface to capture sound emissions during activity.…”

“…The breakdown of fluid film may be from decrease in contact area, third body debris, and damage to the articular surface, or mismatched bearing diameters [14]. Despite squeaking it appears there is no adverse effect on the prostheses [1,4,5].…”

Three-dimensional modeling of in vitro hip kinematics under micro-separation regime for ceramic on ceramic total hip prosthesis: An analysis of vibration and noise

“…Interestingly, in this study the loud audible squeaking of the zirconia/alumina contact stopped when the lubricant was changed and fresh lubricant applied, and resumed later. Glaser et al (2007Glaser et al ( , 2008) produced a 3D model of the leg, which demonstrated a separation between the head and the cup in some patients analyzed under fluoroscopic surveillance. To our best knowledge there is no available mathematical model of a hip simulator under micro-separation conditions that models the precise relative motion between the femoral head and the acetabular cup in the case of hip laxity, especially the sliding path.…”

A Six-Link Kinematic Chain Model of Human Body Using Kane's Method

“…Kane's method has been applied in research into robotic movement [1][2] , modelling surgical repairs of hip joints 3 , and sports fields [4][5] . We construct a two-dimensional six-link kinematic chain model of the human body.…”