A review of pre-clinical testing of femoral stem subsidence and comparison with clinical data

Gheduzzi, S; Miles, A W

doi:10.1243/09544119jeim129

Cited by 34 publications

(27 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This measure is usually divided into subsidence (Steimer et al, 2006) and micromotion (Baleani et al, 2000). Recent studies are mainly using linear variable differential transducers (LVDT's) (Walker et al, 1987;Gilbert et al, 1992;Buhler et al, 1997;Britton et al, 2004;Cristofolini et al, 2007;Gheduzzi and Miles, 2007. LVDT however do not really measure the local relative micromotion between the stem and the bone, but also include bone deformation between the device fixation and the measurement site.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous and multisite measure of micromotion, subsidence and gap to evaluate femoral stem stability

Gortchacow

Wettstein

Pioletti

et al. 2012

Journal of Biomechanics

View full text Add to dashboard Cite

a b s t r a c tThe initial stability of cementless femoral components is crucial for the long-term success of total hip arthroplasty. This has been reported in animal and clinical studies. Until now, the stability was evaluated by the measurement of relative micromotion on a few simultaneous locations around the stem in cadaveric experiments. This paper presents an extended experimental setup to measure simultaneously local micromotion, subsidence and gap on hundreds of points at the bone-stem interface. This technique we applied to anatomical and straight stems in three pairs of cadaveric femurs. Measurements were in agreement with typically reported values. Conversely to other methods, which measure micromotion between implant and bone anchoring points of the measuring device, our method provides local micromotion between stem surface and adjacent bone surface. The observed variation of micromotion at the peri-implant surface confirms the importance of this simultaneous measure on a lot of points around the implant.

show abstract

Section: Introductionmentioning

confidence: 99%

Simultaneous and multisite measure of micromotion, subsidence and gap to evaluate femoral stem stability

Gortchacow

Wettstein

Pioletti

et al. 2012

Journal of Biomechanics

View full text Add to dashboard Cite

show abstract

“…Therefore, in an effort to improve function and survival of prostheses, new materials and designs are continually emerging and require validation. However, the complex behaviour of prostheses in clinical patients has limited the value of in vitro testing [7]. Instead, surgeons place greater reliance on long-term, longitudinal studies [4,8], which are limited in their ability to identify poorly performing components early in their clinical use.…”

Section: Introductionmentioning

confidence: 99%

Early migration characteristics of a hydroxyapatite-coated femoral stem: an RSA study

Campbell

Mercer

Nilsson

et al. 2009

International Orthopaedics (SICOT)

View full text Add to dashboard Cite

Measurement of early stem subsidence can be used to predict the likelihood of long-term femoral component loosening and clinical failure. Data that examines the early migration pattern of clinically proven stems will provide clinicians with useful baseline data with which to compare new stem designs. This study was performed to evaluate the early migration pattern of a hydroxyapatitecoated press-fit femoral component that has been in use for over ten years. We enrolled 30 patients who underwent THA for osteoarthritis. The median age was 70 years (range, 55-80 years). Patients were clinically assessed using the Harris hip score. Radiostereometric analysis was used to evaluate stem migration at three to four days, six months, one year and two years. We observed a mean subsidence of 0.73 mm at six months, 0.62 mm at one year and 0.58 mm at two years and a mean retroversion of 1.82°at six months, 1.90°at one year and 1.59°at two years. This data suggests that subsidence is confined to the first six months after which there was no further subsidence. The results from this study can be compared with those from novel cementless stem designs to help predict the long-term outcome one may expect from new cementless stem designs.

show abstract

“…Most of the experimental measurements of interfacial micromotion are using transducers (LVDT), but this technique provides in fact a measure of the displacement between the 2 fixation points, and not the local micromotions, which could overestimate the micromotions (Gheduzzi and Miles, 2007). In addition, this technique is rather difficult to setup, and allow only a limited number of simultaneous measurements in different locations.…”

Section: Discussionmentioning

confidence: 99%

“…However, even if the problem is clearly observed and partly quantified, measurement methods are not fully satisfactory. Most of the studies are using linear variable differential transducers (LVDT's) (Walker et al, 1987;Gilbert et al, 1992;Buhler et al, 1997;Britton et al, 2004;Gheduzzi and Miles, 2007) which do not really measure the local relative micromotion between the stem and the bone, but also include bone deformation between the device fixation and the measurement site. Besides, the number of simultaneous measurement points is limited to 1 or 2, with a reported maximum of 4 (Cristofolini et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

A new technique to measure micromotion distribution around a cementless femoral stem

Gortchacow¹,

Wettstein²,

Pioletti³

et al. 2011

Journal of Biomechanics

View full text Add to dashboard Cite

a b s t r a c tThe interfacial micromotion is closely associated to the long-term success of cementless hip prostheses. Various techniques have been proposed to measure them, but only a few number of points over the stem surface can be measured simultaneously. In this paper, we propose a new technique based on micro-Computer Tomography (mCT) to measure locally the relative interfacial micromotions between the metallic stem and the surrounding femoral bone. Tantalum beads were stuck at the stem surface and spread at the endosteal surface. Relative micromotions between the stem and the endosteal bone surfaces were measured at different loading amplitudes. The estimated error was 10 mm and the maximal micromotion was 60 mm, in the loading direction, at 1400 N. This pilot study provided a local measurement of the micromotions in the 3 direction and at 8 locations on the stem surface simultaneously. This technique could be easily extended to higher loads and a much larger number of points, covering the entire stem surface and providing a quasi-continuous distribution of the 3D interfacial micromotions around the stem. The new measurement method would be very useful to compare the induced micromotions of different stem designs and to optimize the primary stability of cementless total hip arthroplasty.

show abstract

A review of pre-clinical testing of femoral stem subsidence and comparison with clinical data

Cited by 34 publications

References 63 publications

Simultaneous and multisite measure of micromotion, subsidence and gap to evaluate femoral stem stability

Simultaneous and multisite measure of micromotion, subsidence and gap to evaluate femoral stem stability

Early migration characteristics of a hydroxyapatite-coated femoral stem: an RSA study

A new technique to measure micromotion distribution around a cementless femoral stem

Contact Info

Product

Resources

About