Long-term Results for the Uncemented Zweymuller/Alloclassic Hip Endoprosthesis

Suckel, A.; Geiger, Friedrich; Kinzl, L.; Wülker, Nikolaus; Garbrecht, M.

doi:10.1016/j.arth.2008.03.021

Cited by 91 publications

(62 citation statements)

References 32 publications

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“…In our series we documented ten-year Kaplan-Meier survival of 98.4 % (95 % CI 96.6-100 %) with stem revision and any component revision as the endpoints, and 100 % with cup revision as the endpoint. We compared our results with those of published studies on the original system in primary THA as Table 3 [4,[6][7][8][9][10][11][12]. In these studies, the ten-year Kaplan-Meier survival rates range from 98.9 % to 100 % for the stem [7][8][9]11], from 93 % to 99 % for the cup [7,9,11] and from 92 % to 98 % for the entire system (i.e.…”

Section: Discussionmentioning

confidence: 57%

“…We compared our results with those of published studies on the original system in primary THA as Table 3 [4,[6][7][8][9][10][11][12]. In these studies, the ten-year Kaplan-Meier survival rates range from 98.9 % to 100 % for the stem [7][8][9]11], from 93 % to 99 % for the cup [7,9,11] and from 92 % to 98 % for the entire system (i.e. any component revision as endpoint) [4,6,7,[9][10][11][12].…”

Section: Discussionmentioning

confidence: 59%

“…In these studies, the ten-year Kaplan-Meier survival rates range from 98.9 % to 100 % for the stem [7][8][9]11], from 93 % to 99 % for the cup [7,9,11] and from 92 % to 98 % for the entire system (i.e. any component revision as endpoint) [4,6,7,[9][10][11][12].…”

Section: Discussionmentioning

confidence: 99%

“…Although many studies have documented mid to long-term clinical outcomes with the original system [4][5][6][7][8][9][10][11][12], only a few have been published on the novel system [2,3,13]. To aid healthcare decision-making, we reviewed the results of THAs performed with the novel system at a single centre, and compared these results with those reported in the literature for the original stem.…”

Section: Introductionmentioning

confidence: 99%

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Long-term follow-up of primary total hip arthroplasty with the Alloclassic Variall system

Hochreiter¹,

Brusaferri

Kirschbichler³

et al. 2015

International Orthopaedics (SICOT)

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Purpose The aim of the present study was to evaluate the clinical and radiographic results of primary total hip arthroplasty (THA) performed with the Alloclassic Variall system (a modified version of the Alloclassic Zweymüller system) and to compare them with those in the literature for the original system. Methods Between January 2001 and December 2002, 273 consecutive primary THAs were performed in 259 patients at a single centre with the study system, using ceramic-onceramic (81.7 %) or ceramic-on-highly-crosslinkedpolyethylene (18.3 %) articulations. Results At the time of this study, 28 patients (29 hips; 10.6 %) had died and 40 (43 hips; 15.8 %) were lost to follow-up. Seventeen patients (19 hips; 7.0 %) could be reached only by telephone. There were four revisions in four patients (1.5 %), all involving only the femoral component. Ten-year Kaplan-Meier survival with revision of any component for any reason as the endpoint was 98.4 % (95 % confidence interval: 96.9-100 %; 30 hips remained 'at risk'). A total of 170 unrevised patients (178 hips; 65.2 %) were assessed clinically and radiographically at a median follow-up of 9.3 years (interquartile range [IQR] 8.8-9.8 years). The median Harris hip score (HHS) was 99.9 points (IQR 97.7-100). The score did not differ significantly between the two articulations. There was no sign of radiographic loosening. Conclusions The ten-year implant survival and the HHS score outcomes for THAs performed with the novel system were in line with those documented in the literature for its predecessor.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-term follow-up of primary total hip arthroplasty with the Alloclassic Variall system

Hochreiter¹,

Brusaferri

Kirschbichler³

et al. 2015

International Orthopaedics (SICOT)

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“…Suckel et al reported a follow-up study of a minimum of 15 years of 320 consecutive Zweymüller total hip arthroplasties [15]. The stem had a survival rate of 98.1% (308/314) and a Kaplan-Meier estimate of 0.98 (95% confidence interval, 0.94-0.99) after 17 years.…”

Section: Discussionmentioning

confidence: 99%

The Trochanteric Wing of the Zweymüller Femoral Stem does Not Affect Rotational Stability: An Experimental Study Using a Resin Bone Model

Shigemura¹,

Omae²,

Mitsuhashi³

et al. 2017

IJCEMS

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Abstract:The Preserve stem is a modified Zweymüller femoral stem that omits the trochanteric wing. Omission of the trochanteric wing of the prosthesis might influence its rotational stability, but, there are no reports about the rotational stability of a modified Zweymüller femoral stem. The purpose of this study was to investigate the effect of the trochanteric wing on rotational stability by comparing the modified Zweymüller femoral stem and the original Zweymüller femoral stem. Computed tomography of the right femur was used to construct a resin model of the proximal femur. Three types of uncemented stems were used in this study: Preserve α, β, and exemplary Zweymüller stem. Preserve β is a modified Zweymüller-type of stem with a reduced trochanteric wing. Preserve α is also a Zweymüller-type of stem with a further reduced trochanteric wing. The resin bone model was mounted on a universal testing machine. The stem was inserted into the bone model manually and loaded vertically up to 600 N. Then the stem was rotated posteriorly by 1°/sec until angular rotation was achieved to 5°. The torque at 5° was compared among the three stems. Vertical displacement of the stem during rotation testing was also recorded as a correlative measure for prosthetic subsidence. The results showed that the mean torque at 5° was not significantly different among the Preserve α, β, and exemplary Zweymüller stem (Tukey-Kramer test). Furthermore, the mean vertical displacement amounts during rotation testing were not significantly different among the three stems (Tukey-Kramer test). This study indicate that the Preserve α and β, modified Zweymüller stems, are rotationally as stable as the exemplary Zweymüller stem.

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Interfacial shear strength of bioactive‐coated carbon fiber reinforced polyetheretherketone after in vivo implantation

Nakahara

Takao

Goto

et al. 2012

Journal Orthopaedic Research

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Despite the excellent osseointegration of carbon-fiber-reinforced polyetheretherketone (CFR/PEEK) with a surface hydroxyapatite (HA) coating, the bone-implant interfacial shear strength of HA-coated CFR/PEEK after osseointegration is unclear. We examined the interfacial shear strength of HA-coated CFR/PEEK implants after in vivo implantation in a rabbit femur-implant pullout test model. HA coating was performed by a newly developed method. Uncoated CFR/PEEK, HA-coated blasted titanium alloy, and uncoated blasted titanium alloy were used as control implants. The implants were inserted into drilled femoral cortex, and pull-out tests were conducted after 6 and 12 weeks of implantation to determine maximum interfacial shear strength. The HA-coated CFR/ PEEK (15.7 AE 4.5 MPa) and HA-coated titanium alloy (14.1 AE 6.0 MPa) exhibited significantly larger interfacial shear strengths than the uncoated CFR/PEEK (7.7 AE 1.8 MPa) and the uncoated titanium alloy (7.8 AE 2.1 MPa) at 6 weeks. At 12 weeks, only the uncoated CFR/PEEK (8.3 AE 3.0 MPa) exhibited a significantly smaller interfacial shear strength, as compared to the HA-coated CFR/PEEK (17.4 AE 3.6 MPa), HA-coated titanium alloy (14.2 AE 4.8 MPa), and uncoated titanium alloy (15.0 AE 2.6 MPa). Surface analysis of the removed implants revealed detachment of the HA layer in both the HA-coated CFR/PEEK and titanium alloy implants Keywords: carbon-fiber-reinforced PEEK; interfacial shear strength; hydroxyapatite; coating adhesion; osseointegration Carbon-fiber-reinforced polyetheretherketone (CFR/ PEEK) is attractive for use in orthopedic implants, 1-4 due to high fatigue strength, high chemical stability, no metal ion release, and excellent biocompatibility with direct cell attachment. 5,6 Moreover, mechanical properties, including strength, toughness, and stiffness, can be easily modified by the arrangement of reinforcing fiber volume and orientation. In cementless hip prostheses, tailoring stiffness can minimize bone resorption of the proximal femur due to stress shielding by designing CFR/PEEK stems with elasticity similar to surrounding cortical bone. 7-10 The fatigue resistance and toughness could minimize the risk of implant fracture. 11-13 The metal-free nature of CFR/PEEK prostheses eliminate metal allergy concerns 14 and problems passing through security gates with metal detectors. 15 Furthermore, CT and MRI of areas around the implants can be achieved without artifacts. 16 Despite these theoretical advantages, CFR/PEEK cementless hip prostheses are not yet practical for clinical applications. In vivo wear resistance and subsequent immunoreaction have not been established when used as a bearing surface. Another issue is implant fixation. Achieving a stable bone-implant interface by osseointegration has been a longstanding problem with carbon-fiber-reinforced polymer materials, including CFR/PEEK. 17,18 To date, studies have focused on wear reduction 4,19 or secure implant fixation 20-27 to develop cementless CFR/PEEK prostheses.Given that CFR/PEEK is...

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Long-term Results for the Uncemented Zweymuller/Alloclassic Hip Endoprosthesis

Cited by 91 publications

References 32 publications

Long-term follow-up of primary total hip arthroplasty with the Alloclassic Variall system

Long-term follow-up of primary total hip arthroplasty with the Alloclassic Variall system

The Trochanteric Wing of the Zweymüller Femoral Stem does Not Affect Rotational Stability: An Experimental Study Using a Resin Bone Model

Interfacial shear strength of bioactive‐coated carbon fiber reinforced polyetheretherketone after in vivo implantation

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