Correlation between femoral neck version and strain on the femurafter insertion of femoral prosthesis

Umeda, Naoya; Saito, Masanobu; Sugano, Nobuhiko; Ohzono, Kenji; Nishii, Takashi; Sakai, Takashi; Yoshikawa, Hideki; Ikeda, Daisaku; Murakami, Atsushi

doi:10.1007/s10776-002-0635-2

Cited by 25 publications

(30 citation statements)

References 22 publications

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“…6,8,10,23,24 These studies uniformly revealed a dramatic reduction of the principal strains in the proximal part of the femur for both stem types with the greatest decreases at the calcar especially for the standard stems. Customised proximal fit stems and traditional stems all display non-physiological strain patterns within the proximal femur, with slightly more physiological patterns for the customised stems.…”

Section: Discussionmentioning

confidence: 83%

“…Therefore, we decided to use synthetic femora with identical geometry in the first step, whose strong resemblance in mechanical properties to native bone with interspecimen variability of only between 2.6 and 3.1 % for the axial and bending load was proved in previous studies 34 . A fairly high number of studies previously also used synthetic bones for similar biomechanical testing 10-15 . Due to the small interspecimen variability of synthetic bones it is reasonable to perform the testing on different synthetic femora.…”

Section: Discussionmentioning

confidence: 99%

“…Two synthetic femora (4 th generation left adult composite femur, Sawbones Europe, Malmö, Sweden) with identical anatomy and material properties were used as it was done in previous biomechanical studies in a comparable setting 10-15 . Each femur was embedded distally in a metal cylinder.…”

Section: Methodsmentioning

confidence: 99%

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Changes in strain patterns after implantation of a short stem with metaphyseal anchorage compared to a standard stem: an experimental study in synthetic bone

et al. 2014

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Short stem hip arthroplasties with predominantly metaphyseal fixation, such as the METHA® stem (Aesculap, Tuttlingen, Germany), are recommended because they are presumed to allow a more physiologic load transfer and thus a reduction of stress-shielding. However, the hypothesized metaphyseal anchorage associated with the aforementioned benefits still needs to be verified. Therefore, the METHA short stem and the Bicontact® standard stem (Aesculap, Tuttlingen, Germany) were tested biomechanically in synthetic femora while strain gauges monitored their corresponding strain patterns. For the METHA stem, the strains in all tested locations including the region of the calcar (87% of the non-implanted femur) were similar to conditions of synthetic bone without implanted stem. The Bicontact stem showed approximately the level of strain of the non-implanted femur on the lateral and medial aspect in the proximal diaphysis of the femur. On the anterior and posterior aspect of the proximal metaphysis the strains reached averages of 78% and 87% of the non-implanted femur, respectively. This study revealed primary metaphyseal anchorage of the METHA short stem, as opposed to a metaphyseal-diaphyseal anchorage of the Bicontact stem.

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

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Changes in strain patterns after implantation of a short stem with metaphyseal anchorage compared to a standard stem: an experimental study in synthetic bone

et al. 2014

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“…It has been reported that increase of femoral anteversion is associated with a significant elevation in the bone mineral density of femoral neck bone and trochanter [2]. Moreover, a significant correlation was found between the extent of neck version and compressive strain on the side toward which the prosthetic neck was oriented [19]. In addition, increasing the femoral neck anteversion to an angle of 30°increased hip contact forces and bending moments up to 28% [6], whereas increasing femoral neck anteversion with total hip replacement (THR) femoral component was associated with a reduction in the posterior dislocation of the femoral head and increased stability [5].…”

Section: Introductionmentioning

confidence: 93%

“…The clinical function of femoral neck anteversion is well documented by the fact that it affects in-or out-toeing, dislocation, range of motion, soft tissue strain [3], bone mineral density and bone shape [2], femoral stress [19], contact force [5], and osteolysis [18]. Moreover, increased femoral neck anteversion may introduce in-toeing, and increase hip lateral rotation and congenital hip dislocation, while reduced femoral neck anteversion may cause tearing of the acetabular labrum of the hip and outtoeing [3].…”

Section: Introductionmentioning

confidence: 99%

3D femoral neck anteversion measurements based on the posterior femoral plane in ORTHODOC® system

Lee

Oh²,

Seon

et al. 2006

Med Bio Eng Comput

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This study provides a robust measuring method of the femoral neck anteversion angle for use in a total hip replacement pre-planning program. The femora of 24 patients (69.3 +/- 6.3 years old) were CT-scanned and converted into three-dimensionally volume-rendered models in ORTHODOC (ISS Inc., CA, USA) which is the pre-planning software for ROBODOC surgery. The Mod.ISS method (the modified ISS method), designed by authors, measures the anteversion angle of the proximal-most femoral neck confluence on the plane perpendicular to the femoral mechanical axis. 3D FNC method proposed by the authors of the present study involves measurement of the anteversion angle of three-dimensional femoral neck center on a plane perpendicular to the posterior femoral plane and parallel to the posterior condylar axis. Here, we found that interobserver reproducibility was 1.8 degrees (SD = 1.3) for the Mod.ISS method and 2.4 (SD = 1.9) for the proposed 3D FNC method. The anteversion angle of the local femoral neck axis was measured as theta = 25.3(L/D) + [corrected] 5.4 in L/D = 0.1-0.6, where L/D is distance (L) from the proximal-most neck confluence along the femoral mechanical axis, normalized with respect to the diameter of the femoral head (D). At L/D = 0.5, the anteversion angle of the femoral neck axis was coincident with the average femoral neck anteversion determined by the 3D FNC method. We conclude that the 3D FNC method is a gold standard for measuring the femoral neck anteversion applicable during both pre-operative and post-operative stages, because its femoral neck center can be determined in three-dimensional space during both stages.

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Can the Increased Loosening Rate of the Modular-Neck Hip Systems Be Attributed to Geometric Design Parameters? An Alternative Approach Using Finite Element Analysis

Theodorou

Georgiou

Provatidis

et al. 2013

Total Hip Arthroplasty

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Correlation between femoral neck version and strain on the femurafter insertion of femoral prosthesis

Cited by 25 publications

References 22 publications

Changes in strain patterns after implantation of a short stem with metaphyseal anchorage compared to a standard stem: an experimental study in synthetic bone

Changes in strain patterns after implantation of a short stem with metaphyseal anchorage compared to a standard stem: an experimental study in synthetic bone

3D femoral neck anteversion measurements based on the posterior femoral plane in ORTHODOC® system

Can the Increased Loosening Rate of the Modular-Neck Hip Systems Be Attributed to Geometric Design Parameters? An Alternative Approach Using Finite Element Analysis

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