scholarly journals Initial Rotational Instability of the Tapered Wedge-Shaped Type Cementless Stem

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Yosuke Iwamoto ◽  
Hiroaki Kijima ◽  
Hiroshi Tazawa ◽  
Natsuo Konishi ◽  
Hitoshi Kubota ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Rotational Instability ◽  
Femoral Canal ◽  
Cementless Stem ◽  
Anteversion Angle ◽  
Rotational Angle ◽  
Femoral Neck Anteversion ◽  
Stem Subsidence ◽  
The Mean ◽  
Hip Arthroplasties

Background. Because the tapered wedge-shaped type cementless stem has a small anteroposterior width and a low occupation rate in the medullary space, postoperative rotational instability and stem subsidence due to inadequate proximal fixation are concerns. The purpose of this study was to clarify the relationship between the rotational instability of the tapered wedge-shaped type cementless stem and femoral canal shape. Methods. A total of 61 primary total hip arthroplasties with the tapered wedge-shaped type cementless stem Accolade® TMZF (11 males, 50 females; mean age 60 years) from January 2012 to June 2015 who underwent computed tomography before surgery and within 4 weeks and 1 year after surgery were evaluated. The preoperative femoral neck anteversion angle, preoperative femoral canal flair index, the degree of postoperative stem subsidence within 1 year after operation, and the degree of rotational change in the stem setting angle within 1 year after operation were investigated. Results. The mean preoperative femoral neck anteversion angle was 32.2° ± 17.8° (0°–69°), and the mean preoperative canal flair index was 3.68 ± 0.58 (2.44–5.55). There were no stem subsidence cases within 1 year after operation. The mean degree of rotational change in the stem from immediately to 1 year after surgery was −0.4° ± 1.7° (−3°–3°). There was no significant correlation between the canal flair index and the rotational change in the stem. In addition, the mean difference between the preoperative femoral neck anteversion angle and the stem rotational angle immediately after surgery was only 1.3° ± 5.3° (−29°–15°). Conclusions. In all cases, including stove-pipe cases, the degree of rotational change in the Accolade® TMZF stem from immediately to 1 year after surgery was within 3°. In other words, regardless of femoral canal shape, the tapered wedge-shaped type cementless stem has little initial rotational instability.

MPR realignment increases accuracy when measuring femoral neck anteversion angle

2013 ◽  
Vol 42 (8) ◽  
pp. 1119-1125 ◽  
Author(s):  
Tommy Hemmert Olesen ◽  
Trine Torfing ◽  
Søren Overgaard
Keyword(s):  
Femoral Neck ◽  
Anteversion Angle ◽  
Femoral Neck Anteversion

The consistency between measurements of the femoral neck anteversion angle in DDH on three-dimensional CT and MRI

2015 ◽  
Vol 57 (6) ◽  
pp. 716-720 ◽  
Author(s):  
Cunhua Mao ◽  
Yanchen Liang ◽  
Chengzong Ding ◽  
Lingfei Guo ◽  
Yanbing Wang ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Three Dimensional ◽  
Anteversion Angle ◽  
Femoral Neck Anteversion ◽  
Ct And Mri

Measurement of the femoral neck anteversion angle in the dog using computed tomography

2007 ◽  
Vol 174 (2) ◽  
pp. 378-383 ◽  
Author(s):  
M.M.D. Ginja ◽  
J.M. Gonzalo-Orden ◽  
S.S. Jesus ◽  
A.M. Silvestre ◽  
M.P. Llorens-Pena ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Femoral Neck ◽  
Anteversion Angle ◽  
Femoral Neck Anteversion

scholarly journals Primary Total hip Arthroplasty Using A Short Bone-Conserving Stem in Young Adult Osteoporotic Patients with Dorr type C Femoral Bone

2020 ◽  
Author(s):  
Ping Zhen ◽  
Yanfeng Chang ◽  
Heng Yue ◽  
Hui Chen ◽  
Shenghu Zhou ◽  
...  
Keyword(s):  
Young Adult ◽  
Hip Arthroplasty ◽  
Harris Hip Score ◽  
Femoral Canal ◽  
Femoral Bone ◽  
Severe Osteoporosis ◽  
Type C ◽  
The Mean ◽  
Hip Arthroplasties

Abstract Background: Dorr Type C femoral bone exhibits a wide, stovepipe-shaped femoral canal and thin cortices in the proximal femur. Dorr C bone combined with severe osteoporosis is an important challenge in primary hip arthroplasty. In this study, we assessed the effects of short metaphyseal fitting cementless stems on preformatted primary total hip arthroplasties in young adult osteoporotic patients with this femoral presentation.Methods: A total of 42 hip arthroplasties were performed in 35 young patients (range, 20 to 36 years) using a short Tri-lock bone preservation metaphyseal-fitting cementless femoral component between 2012 and 2017. The mean age at surgery of the 27 male (33 hips) and 8 female (9 hips) patients was 27.5 ± 3.7 years (range 20.3 to 35.8 years). The mean body mass index (BMI) was 20.2 kg/m2 (range, 16.8–23.2 kg/m2). According to Dorr’s criteria, all 42 femora were classified as type C bone and all femurs suffered from severe osteoporosis (Singh index≤3). Results: The mean follow-up period was 5.5 ± 1.1 years (range, 3.0–8.0 years). The clinical and functional results improved for the Harris hip score, WOMAC, and UCLA activity scores. The Harris Hip score improved from 48.0 ± 8.0 (range 38.0 to 61.0) preoperatively to 87.0 ± 9.0 (range 77.0 to 92.0) at 12 months after surgery and 91.0 ± 8.0 (range 85.0 to 98.0) at final follow-up. The preoperative UCLA activity score was 3.0±0.5 points (range, 1.0–4.0 points), which significantly improved to 7.5±0.7 points (range, 6.0–8.0 points) at the final follow-up. No patient exhibited thigh pain at the final follow-up. The mean stem-to-canal fill percentages were 97% ± 2.1% (anteroposterior view at midstem). For stem alignment, 40 hips (95.2%) of the femoral stem were positioned neutral to 3° of varus with reference to the femoral shaft axis. The remaining two were positioned at 4° varus to 4° valgus. Radiographic evaluation showed good osteointegration of the implants in follow-up.Conclusions: Based on the tapered-wedge design and proximal porous coating, the shortened tapered conventional stem can achieve reliable stability through neck filling and metaphyseal fixation, which does not depend on the isthmus hoop stress. This stem was suitable in severe osteoporotic patients with Type C bones in young adults who presented with a correspondingly straightened femoral canal with a wide isthmus and thin cortex.

scholarly journals Primary total hip arthroplasty using a short bone-conserving stem in young adult osteoporotic patients with Dorr type C femoral bone

2020 ◽  
Author(s):  
Ping Zhen ◽  
Yanfeng Chang ◽  
Heng Yue ◽  
Hui Chen ◽  
Shenghu Zhou ◽  
...  
Keyword(s):  
Young Adult ◽  
Hip Arthroplasty ◽  
Harris Hip Score ◽  
Femoral Canal ◽  
Femoral Bone ◽  
Severe Osteoporosis ◽  
Type C ◽  
The Mean ◽  
Hip Arthroplasties

Abstract BackgroundDorr Type C femoral bone exhibits a wide, stovepipe-shaped femoral canal and thin cortices in the proximal femur. Dorr C bone combined with severe osteoporosis is an important challenge in primary hip arthroplasty. In this study, we assessed the effects of short metaphyseal fitting cementless stems on preformatted primary total hip arthroplasties in young adult osteoporotic patients with this femoral presentation.MethodsA total of 42 hip arthroplasties were performed in 35 young patients (range 20 to 36 years) using a short Tri-lock bone preservation metaphyseal-fitting cementless femoral component between 2012 and 2017. The mean age at surgery of the 27 male (33 hips) and 8 female (9 hips) patients was 27.5 years (range 20.3 to 35.8 years). The mean body mass index (BMI) was 20.2 kg/m 2 (range, 16.8-23.2 kg/m 2 ). According to Dorr’s criteria, all 42 femora were classified as type C bone and all femurs suffered from severe osteoporosis (Singh index≤3).ResultsThe mean follow-up period was 5.5 years (range 3.0 to 8.0 years). The clinical and functional results improved for the Harris hip score, WOMAC, and UCLA activity scores. The Harris Hip score improved from 48.0 ± 8.0 (range 38.0 to 61.0) preoperatively to 87.0 ± 9.0 (range 77.0 to 92.0) at 12 months after surgery and 91.0 ± 8.0 (range 85.0 to 98.0) at final follow-up. The preoperative UCLA activity score was 3.0 ± 0.5 points (range, 1.0-4.0 points), which significantly improved to 7.5 ± 0.7 points (range 6.0 to 8.0 points) at the final follow-up. No patient exhibited thigh pain at the final follow-up. The mean stem-to-canal fill percentages were 97% ± 2.1% (anteroposterior view at midstem). For stem alignment, 40 hips (95.2%) of the femoral stem were positioned neutrally to 3° of varus with reference to the femoral shaft axis. The remaining two were positioned at 4° varus to 4° valgus. Radiographic evaluation showed good osteointegration of the implants in follow-up.ConclusionsBased on the tapered-wedge design and proximal porous coating, the shortened tapered conventional stem can achieve reliable stability through neck filling and metaphyseal fixation, which does not depend on the isthmus hoop stress. This stem was suitable in severe osteoporotic patients with Type C bones in young adults who presented with a correspondingly straightened femoral canal with a wide isthmus and thin cortex.

scholarly journals Primary total hip arthroplasty using a short bone-conserving stem in young adult osteoporotic patients with Dorr type C femoral bone

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Ping Zhen ◽  
Yanfeng Chang ◽  
Heng Yue ◽  
Hui Chen ◽  
Shenghu Zhou ◽  
...  
Keyword(s):  
Young Adult ◽  
Hip Arthroplasty ◽  
Harris Hip Score ◽  
Femoral Canal ◽  
Femoral Bone ◽  
Severe Osteoporosis ◽  
Type C ◽  
The Mean ◽  
Hip Arthroplasties

Abstract Background Dorr type C femoral bone exhibits a wide, stovepipe-shaped femoral canal, and thin cortices in the proximal femur. Dorr C bone combined with severe osteoporosis is an important challenge in primary hip arthroplasty. In this study, we assessed the effects of short metaphyseal fitting cementless stems on preformatted primary total hip arthroplasties in young adult osteoporotic patients with this femoral presentation. Methods A total of 42 hip arthroplasties were performed in 35 young patients (range 20 to 36 years) using a short Tri-lock bone preservation metaphyseal-fitting cementless femoral component between 2012 and 2017. The mean age at surgery of the 27 male (33 hips) and 8 female (9 hips) patients was 27.5 years (range 20.3 to 35.8 years). The mean body mass index (BMI) was 20.2 kg/m2 (range, 16.8–23.2 kg/m2). According to Dorr’s criteria, all 42 femora were classified as type C bone and all femurs suffered from severe osteoporosis (Singh index ≤ 3). Results The mean follow-up period was 5.5 years (range 3.0 to 8.0 years). The clinical and functional results improved for the Harris hip score, WOMAC, and UCLA activity scores. The Harris Hip score improved from 48.0 ± 8.0 (range 38.0 to 61.0) preoperatively to 87.0 ± 9.0 (range 77.0 to 92.0) at 12 months after surgery and 91.0 ± 8.0 (range 85.0 to 98.0) at final follow-up. The preoperative UCLA activity score was 3.0 ± 0.5 points (range, 1.0–4.0 points), which significantly improved to 7.5 ± 0.7 points (range 6.0 to 8.0 points) at the final follow-up. No patient exhibited thigh pain at the final follow-up. The mean stem-to-canal fill percentages were 97% ± 2.1% (anteroposterior view at midstem). For stem alignment, 40 hips (95.2%) of the femoral stem were positioned neutrally to 3° of varus with reference to the femoral shaft axis. The remaining two were positioned at 4° varus to 4° valgus. Radiographic evaluation showed good osteointegration of the implants in follow-up. Conclusions Based on the tapered-wedge design and proximal porous coating, the shortened tapered conventional stem can achieve reliable stability through neck filling and metaphyseal fixation, which does not depend on the isthmus hoop stress. This stem was suitable in severe osteoporotic patients with type C bones in young adults who presented with a correspondingly straightened femoral canal with a wide isthmus and thin cortex.

Aspects of femoral neck anteversion

1988 ◽  
Vol 29 (6) ◽  
pp. 689-694 ◽  
Author(s):  
A. Høiseth ◽  
O. Reikerås ◽  
E. Fønstelien
Keyword(s):  
Femoral Neck ◽  
Femoral Neck Anteversion

The impact of symptomatic femoral neck anteversion and tibial torsion on gait, function and participation in children and adolescents

2021 ◽  
Vol 86 ◽  
pp. 144-149
Author(s):  
Jessie Mackay ◽  
Pam Thomason ◽  
Morgan Sangeux ◽  
Elyse Passmore ◽  
Kate Francis ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Children And Adolescents ◽  
Tibial Torsion ◽  
Femoral Neck Anteversion ◽  
Gait Function ◽  
The Impact
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