Med Biol Eng Comput - Effects of design parameters of total hip components on the impingement angle and determination of the preferred liner skirt shape with an adequate oscillation angle.

Tópicos

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Resumo

The oscillation angle (OsA), which is the sum of the impingement angles on the two sides when the prosthetic neck sways from the neutral axis of the acetabular cup to the liner rim, is one of the most important factors that can affect the range of motion of an artificial hip joint. The aim of this study was to determine the influence of total hip component design on the impingement angle. Our findings show that an increase in cup depth of the liner restricts the motion of the neck and results in a reduced impingement angle, while an increase in chamfer angle increases the impingement angle until it reaches a critical value when a further increase no longer results in an increase in impingement angle. The impingement angle is not only dependent on the head/neck ratio, but also on the head size itself. For most arbitrarily chosen cup depths and chamfer angles, the neck only impacts at one point on the liner. This study proposes a suitable combination of cup depth and chamfer angle and a preferred impact mode, which, if impingement does occur, enables the neck to impinge on the liner rim over a large area. Cup-neck combinations that have an adequate OsA with maximum femoral head coverage are presented.

Resumo Limpo

oscil angl osa sum imping angl two side prosthet neck sway neutral axi acetabular cup liner rim one import factor can affect rang motion artifici hip joint aim studi determin influenc total hip compon design imping angl find show increas cup depth liner restrict motion neck result reduc imping angl increas chamfer angl increas imping angl reach critic valu increas longer result increas imping angl imping angl depend headneck ratio also head size arbitrarili chosen cup depth chamfer angl neck impact one point liner studi propos suitabl combin cup depth chamfer angl prefer impact mode imping occur enabl neck imping liner rim larg area cupneck combin adequ osa maximum femor head coverag present

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