Fluid load support and contact mechanics of hemiarthroplasty in the natural hip joint

Pawaskar, Sainath Shrikant; Ingham, Eileen; Fisher, John; Zhang, Jin

doi:10.1016/j.medengphy.2010.09.009

Cited by 32 publications

(17 citation statements)

References 66 publications

(85 reference statements)

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“…The number is comparable with previous models (e.g. six cycles in the hemiarthroplasty hip model 15 and five cycles in the knee model 27 ) and was sufficient to provide an initial insight into the time-dependent behaviour of the hip joint under dynamic loads.…”

Section: Methodssupporting

confidence: 64%

“…Further studies will be undertaken to investigate the influence of a tension–compression nonlinear solid phase on model predictions and computing expense, to determine whether it is necessary to incorporate this more sophisticated material behaviour. Although more cycles were investigated in this study than previous models, 15 the period of 10 cycles of walking was not sufficient to allow all the outputs to have reached a stable state from one cycle to the next. In particular, the fluid support ratio during the latter part of the cycle was still dropping by the 10th cycle.…”

Section: Discussionmentioning

confidence: 99%

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Biphasic investigation of contact mechanics in natural human hips during activities

Hua

Zhang

et al. 2014

Proc Inst Mech Eng H

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The aim of this study was to determine the cartilage contact mechanics and the associated fluid pressurisation of the hip joint under eight daily activities, using a three-dimensional finite element hip model with biphasic cartilage layers and generic geometries. Loads with spatial and temporal variations were applied over time and the time-dependent performance of the hip cartilage during walking was also evaluated. It was found that the fluid support ratio was over 90% during the majority of the cycles for all the eight activities. A reduced fluid support ratio was observed for the time at which the contact region slid towards the interior edge of the acetabular cartilage, but these occurred when the absolute level of the peak contact stress was minimal. Over 10 cycles of gait, the peak contact stress and peak fluid pressure remained constant, but a faster process of fluid exudation was observed for the interior edge region of the acetabular cartilage. The results demonstrate the excellent function of the hip cartilage within which the solid matrix is prevented from high levels of stress during activities owing to the load shared by fluid pressurisation. The findings are important in gaining a better understanding of the hip function during daily activities, as well as the pathology of hip degeneration and potential for future interventions. They provide a basis for future subject-specific biphasic investigations of hip performance during activities.

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Section: Methodssupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Biphasic investigation of contact mechanics in natural human hips during activities

Hua

Zhang

et al. 2014

Proc Inst Mech Eng H

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“…Data from followup longer than 1 or 2 years are sparse, however. Studies with bipolar hemiarthroplasty indicate that acetabular wear is less of a problem than previously thought [8,31]. Several reports show, however, high rates of pain, migration, and the need for revision to THA in middle-and long-term followup [24,38].…”

Section: Introductionmentioning

confidence: 98%

Randomized Trial of Hemiarthroplasty versus Internal Fixation for Femoral Neck Fractures: No Differences at 6 Years

Støen

Lofthus

Nordsletten

et al. 2014

Clinical Orthopaedics &Amp; Related Research

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Background Hemiarthroplasty has been shown superior to internal fixation for displaced femoral neck fractures (FNF) in the first 2 years. However, there are unanswered questions about the performance of hemiarthroplasty over the longer term compared with internal fixation. Questions/purposes We sought to compare hemiarthroplasty with internal fixation in terms of (1) outcomes scores for pain, hip function, and quality of life at a minimum of 5 years after surgery in a randomized trial. A secondary purpose was to compare (2) patient survival and (3) frequency of reoperation in the two groups. Methods A total of 222 consecutive patients older than 60 years, including those cognitively impaired, with FNF were randomized to either internal fixation with two parallel screws or bipolar hemiarthroplasty. At a minimum followup of 4.9 years (mean, 5.9 years; range, 4.9-7.2 years), 68 of the 70 surviving patients were examined by a study nurse and study physiotherapist blinded to initial treatment. Questionnaires on hip function (Harris hip score), quality of life (Eq5D), and activity of daily living function (Barthel ADL) were administered. The Barthel ADL index score was split into good function (score 95 or 100) and reduced function (score below 95).

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“…(3) Medium Sensitivity (2) Low Sensitivity (1) Low Sensitivity Ateshian, 1997;Pawaskar et al, 2009). The reduction in contact stresses with the increasing conformity has also been observed in experiments carried out in vitro (McCann et al, 2009).…”

Section: Discussionmentioning

confidence: 71%

Hemiarthroplasty of hip joint: An experimental validation using porcine acetabulum

Pawaskar

Grosland

Ingham

et al. 2011

Journal of Biomechanics

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Fluid load support and contact mechanics of hemiarthroplasty in the natural hip joint

Cited by 32 publications

References 66 publications

Biphasic investigation of contact mechanics in natural human hips during activities

Biphasic investigation of contact mechanics in natural human hips during activities

Randomized Trial of Hemiarthroplasty versus Internal Fixation for Femoral Neck Fractures: No Differences at 6 Years

Hemiarthroplasty of hip joint: An experimental validation using porcine acetabulum

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