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Schilcher J, Ivarsson I, Perlbach R, Palm L. No Difference in Periprosthetic Bone Loss and Fixation Between a Standard-Length Stem and a Shorter Version in Cementless Total Hip Arthroplasty. A Randomized Controlled Trial. J Arthroplasty 2017; 32:1220-1226. [PMID: 27993496 DOI: 10.1016/j.arth.2016.11.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Revised: 10/27/2016] [Accepted: 11/09/2016] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Cementless femoral stems in total hip arthroplasty provide dependable clinical and radiographic results in the treatment of osteoarthritis. Stem length might affect the preservation of proximal bone stock and stability. We hypothesized that a shorter stem decreases proximal bone loss without affecting implant stability. METHODS We randomly assigned 60 patients aged between 50 and 70 years to either a standard cementless femoral stem or a 35-mm shorter version. Patients were followed with dual-energy X-ray absorptiometry, radiostereometric analysis, Harris hip score, Western Ontario and McMaster Universities Osteoarthritis Index score, and clinical follow-up at 3, 6, 12, and 24 months. The trial is registered on ClinicalTrials.gov/. RESULTS After 24 months, short stems had on average 3.8% (95% confidence interval, 1.2%-8.9%) more bone loss in zone 1 compared to standard stems (P = .14). In zone 7, the bone loss was on average 6.5% (95% confidence interval, 6.6%-19.7%) higher compared to standard stems (P = .33). After 24 months, standard stems had migrated 0.93 mm (range, 0.25-4.66 mm) and short stems 0.93 mm (range, 0.17-2.96 mm; Student t-test after log transformation, P = .3). Patient-reported outcome measures were similar in both groups. One patient in the standard stem group was diagnosed with infection, one with a posterior dislocation, and one with a deep venous thrombosis. No stems were revised. CONCLUSION There were no statistically significant differences in periprosthetic bone loss or fixation between the stems at 24 months.
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Frew N, Johnson G. Survival of the Birmingham hip resurfacing in young men up to 13 years post-operatively. Acta Orthop Belg 2017; 83:67-73. [PMID: 29322897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The aim of this study was to determine the medium to long term survivorship of the Birmingham Hip Resurfacing prosthesis in an independent series of young men. The medical records and radiographs of all men aged 55 and under who had undergone Birmingham hip resurfacing by the senior author were reviewed. Patients who had not attended recent follow-up or had been previously discharged were contacted by telephone. Between 1999 and 2011 a total of 147 hips were resurfaced in 155 patients (mean age 47 years (19 to 55)) with minimum 5 year follow-up (mean 8.2, range 5 to 13.9 years). Eleven hips were revised giving overall cumulative survival of 88.8% at 13 years. In conclusion, this independent, single surgeon series demonstrates acceptable survival of the Birmingham Hip resurfacing in young men. It remains a valid option in certain cases but we believe alternative bearings are more suitable for most patients.
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Varnum C. Outcomes of different bearings in total hip arthroplasty - implant survival, revision causes, and patient-reported outcome. DANISH MEDICAL JOURNAL 2017; 64:B5350. [PMID: 28260601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Total hip arthroplasty (THA) is a common and successful treatment of patients suffering from severe osteoarthritis that significantly reduces pain and improves hip function and quality of life. Traditionally, the outcome of THA has been evaluated by orthopaedic surgeons and assessed in morbidity and mortality rates, and implant survival. As patients and surgeons may assess outcome after THA differently, patient-reported outcomes (PROMs) have gained much more interest and are today recognized as very important tools for evaluating the outcome and satisfaction after THA. One of the prognostic factors for the outcome of THA is the type of bearings. This PhD thesis focuses on the influence of different types of bearings on implant survival, revision causes, PROMs, and noises from THA. The aims of the thesis were: Study I: To examine the revision risk and to investigate the causes of revision of cementless ceramic-on-ceramic (CoC) THAs comparing them to those of "standard" metal-on-polyethylene (MoP) THAs. Study II: To compare the six-year revision risk for metal-on-metal (MoM) with that for MoP bearings in cementless stemmed THA, and further to study the revision risk for different designs of stemmed MoM THAs and the causes of revision. Study III: To examine the association between CoC, MoM, and MoP bearings and both generic and disease-specific PROMs, and furthermore to examine the incidence and types of noises from the three types of bearings and identify the effect of noises on PROM scores. In study I and III, we used data from the Danish Hip Arthroplasty Registry combined with data from the Civil Registration System and the Danish National Patient Registry. In study II, data from the Nordic Arthroplasty Register Association, containing data from hip arthroplasty registries in Denmark, Norway, Sweden, and Finland, was used. In study I, 11,096 patients operated from 2002 through 2009 with cementless THA were included. Of these, 16% had CoC THA and 84% had MoP THA. At 8.7-year follow-up, no difference in RR of revision for any cause was found for CoC compared to MoP THA. One cause of revision related only to CoC THA is ceramic fracture. Medical records were reviewed for patients who had revision surgery due to component failure, and six patients (0,34%) had been revised due to ceramic fracture. No other difference in prevalence of causes of revision was found when comparing CoC to MoP THA. Study II included 32,678 patients who were operated from 2002 through 2010 with cementless stemmed THA with either MoM bearings (11,567 patients, 35%) or MoP bearings (21,111 patients, 65%). At six-year follow-up, the RR of revision for any cause was significantly higher for MoM compared to MoP THA. When comparing different combinations of cup/stem with MoM to MoP bearings, there was an increased RR of revision for any cause for the ASR/Summit, ASR/Corail, and "other" combinations. There was a higher prevalence of revision due to aseptic loosening for MoM compared to MoP THA. In contrast, the prevalence of revision due to dislocation was lower for MoM THA. In study III, a set of questionnaires including HOOS, EQ-5D, UCLA activity score, and a questionnaire about noises from the THA was sendt to patients having THA with CoC, MoM, or MoP bearings. The response rate was 85% and among the 3,089 patients responding, 45% received CoC, 17% MoM, and 38% MoP THA. No differences in mean subscale scores were found for CoC and MoM compared to MoP THA, except for CoC THA that had a lower mean HOOS symptoms score than MoP THA. 27% of patients with CoC, 29% of patients with MoM, and 12% of patients with MoP bearings had experienced noises from the THA. For the three types of bearings, PROM scores from patients with noisy THA were significantly lower when compared to silent MoP THA, except for noisy CoC and MoM THA that had the same mean UCLA activity score as silent MoP THA.
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Grant TW, Lovro LR, Licini DJ, Warth LC, Ziemba-Davis M, Meneghini RM. Cementless Tapered Wedge Femoral Stems Decrease Subsidence in Obese Patients Compared to Traditional Fit-and-Fill Stems. J Arthroplasty 2017; 32:891-897. [PMID: 27793497 DOI: 10.1016/j.arth.2016.09.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 08/01/2016] [Accepted: 09/08/2016] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Femoral component stability and resistance to subsidence is critical for osseointegration and clinical success in cementless total hip arthroplasty. The purpose of this study was to radiographically evaluate the anatomic fit and subsidence of 2 different proximally tapered, porous-coated modern cementless femoral component designs. METHODS A retrospective cohort study of 126 consecutive cementless total hip arthroplasties was performed. Traditional fit-and-fill stems were implanted in the first 61 hips with the remaining 65 receiving morphometric tapered wedge stems. Preoperative bone morphology was radiographically assessed by the canal flare index. Canal fill in the coronal plane, subsidence, and the sagittal alignment of stems was measured digitally on immediate and 1-month postoperative radiographs. RESULTS Demographics and canal flare indices were similar between groups. The percentage of femoral canal fill was greater in the tapered wedge compared to the fit-and-fill stem (P = .001). There was significantly less subsidence in the tapered wedge design (0.3 mm) compared to the fit-and-fill design (1.1 mm) (P = .001). Subsidence significantly increased as body mass index (BMI) increased in the fit-and-fill stems, a finding not observed in the tapered wedge design (P = .013). CONCLUSION An anatomically designed morphometric tapered wedge femoral stem demonstrated greater axial stability and decreased subsidence with increasing BMI than a traditional fit-and-fill stem. The resistance to subsidence, irrespective of BMI, is likely due to the inherent axial stability of a tapered wedge design and may be the optimal stem design for obese patients.
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Schnurr C, Schellen B, Dargel J, Beckmann J, Eysel P, Steffen R. Low Short-Stem Revision Rates: 1-11 Year Results From 1888 Total Hip Arthroplasties. J Arthroplasty 2017; 32:487-493. [PMID: 27639304 DOI: 10.1016/j.arth.2016.08.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 07/11/2016] [Accepted: 08/08/2016] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND In total hip arthroplasty, short stems were developed as a bone-conserving alternative to traditional cementless stems. So far, there have been very few recorded medium to long-term results of these comparatively new implants. The aim of our retrospective study was to report on the survival of calcar-loading short stems. METHODS All Metha stem implantations from 2004 to 2014 were recorded from the operation protocols (n = 1888). Due to the chronological development of the stem, 3 different versions were implanted: modular titanium stems with neck adapters from titanium or cobalt-chrome and monoblock stems. Patients were questioned by post about revision, dislocation, and satisfaction. RESULTS Data were complete for 93% of the procedures (1090 monoblock stems, 314 modular stems with titanium neck, and 230 modular stems with cobalt chrome neck). Mean follow-up was 6 years (1-11 years). Fifteen modular titanium implants were affected by cone fractures (4%). Therefore, monoblock, modular cobalt chrome, and modular titanium implants were analyzed separately. The 7-year revision rate for monoblock stems was 1.5%; for modular cobalt-chrome stems it was 1.8%, and for modular titanium stems it was 5.3%. CONCLUSION Our data show the midterm survival of the monoblock and modular cobalt-chrome implants equivalent to the traditional cementless stems. These might, therefore, be considered as a bone-conserving alternative for young and active patients.
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Berend KR, Adams JB, Morris MJ, Lombardi AV. Three-Year Results with a Ringless Third-Generation Porous Plasma Sprayed Acetabular Component in Primary Total Hip Arthroplasty. Surg Technol Int 2017; 30:295-299. [PMID: 28072898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
INTRODUCTION We previously reported promising early results in patients undergoing primary total hip arthroplasty (THA) with a third-generation cementless acetabular system that has a porous plasma-sprayed coating on a titanium alloy substrate shell, a ringless barb and groove locking mechanism, and a vitamin E-infused highly crosslinked polyethylene insert. The purpose of this study was to examine the outcomes and need for revision in a subset of patients previously reviewed who now have potential for three-year follow-up. PATIENTS AND METHODS A query of our practice registry revealed 235 consented patients (241 hips) who underwent cementless primary THA performed by three surgeons with the G7® Acetabular System (Zimmer Biomet, Warsaw, Indiana) between April 2013 and September 2013. All liners were vitamin E-infused highly crosslinked polyethylene with a neutral face. Mean patient age was 65.8 years and mean BMI was 31.3 kg/m2. Heads used were 179 Biolox® delta (74%; CeramTec AG, Plochingen, Germany) and 62 cobalt-chromium (26%), with diameters of 32mm in 105 (41%) and 36mm in 136 (56%). RESULTS A minimum three-year follow-up was available for 152 hips in 146 patients. Harris Hip Scores improved from 47.8 to 88.2, and UCLA activity scale from 3.9 to 5.4. One patient from this study period required cup revision secondary to failure of biological fixation at 15.1 months postoperative. There have been no dislocations or other revisions of the acetabular component. Kaplan-Meier survival with endpoint of acetabular revision was 99.5% (95% CI: 99.0% to 100%) at 3.4 years. Radiographic findings in all cases were satisfactory position and alignment with no radiolucencies observed. CONCLUSION In this study, with minimum three-year follow-up, good results with 99.5% survival were achieved using a third-generation cementless acetabular system with a ringless barb and groove locking mechanism.
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Cadossi M, Garcia FL, Sambri A, Andreoli I, Dallari D, Pignatti G. A 2- to 7-Year Follow-Up of a Modular Iliac Screw Cup in Major Acetabular Defects: Clinical, Radiographic and Survivorship Analysis With Comparison to the Literature. J Arthroplasty 2017; 32:207-213. [PMID: 27449716 DOI: 10.1016/j.arth.2016.06.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 05/10/2016] [Accepted: 06/11/2016] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Inadequate acetabular bone stock is a major issue in total hip arthroplasty, and several treatment options are available. Stemmed cups have been used in this scenario with variable results. A novel modular polyaxial uncemented iliac screw cup (HERM-BS-Sansone cup-Citieffe s.r.l., Calderara di Reno, Bologna, Italy) has been recently introduced to overcome the drawbacks of stemmed cups. In this retrospective study, we report the results of this cup in patients with large acetabular bone defects at 2- to 7-year follow-up. METHODS We evaluated a consecutive series of 121 hips (118 revisions and 3 complex primary arthroplasties) treated with this novel cup at a mean follow-up of 46 months. Kaplan-Meier survival analysis was performed with implant revision for any reason as a primary end point. Further survival analysis was performed excluding septic failures. Clinical outcome was assessed with the Harris Hip Score. RESULTS There had been 7 reoperations: 1 for aseptic loosening, 5 for deep infection, and 1 for recurrent dislocation. In 5 cases, the cup was removed; estimated survival rate at 5-year follow-up with implant removal for any reason was 95.6% (95% confidence interval = 91-99), and 98.3% (95% CI = 96-100) excluding those failed for infection. Mean Harris Hip Score at latest follow-up was 77 points (range, 44-95; standard deviation = 11.9). CONCLUSION The present findings show the short-term efficacy of the iliac screw cup with respect to implant survival. A longer follow-up and a larger number of patients are necessary to confirm the encouraging preliminary results.
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Grosso MJ, Danoff JR, Murtaugh TS, Trofa DP, Sawires AN, Macaulay WB. Hemiarthroplasty for Displaced Femoral Neck Fractures in the Elderly Has a Low Conversion Rate. J Arthroplasty 2017; 32:150-154. [PMID: 27480829 DOI: 10.1016/j.arth.2016.06.048] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 06/19/2016] [Accepted: 06/27/2016] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Hemiarthroplasty (HA) has been a mainstay treatment for displaced femoral neck fractures for many years. The purpose of this study was to report the conversion rate of HA to total hip arthroplasty (THA) for displaced femoral neck fractures and compare outcomes between implant constructs (bipolar vs unipolar), fixation options (cemented vs cementless stems), and age groups (<75 years vs ≥75 years). METHODS We retrospectively reviewed the results of a consecutive cohort of 686 patients who underwent HA for the treatment of femoral neck fractures at our institution between 1999 and 2013 with a minimum of 2-year follow-up. RESULTS The overall component revision rate, including conversion to THA, revision HA, revision with open reduction internal fixation, and Girdlestone procedure, was 5.6% (39/686). Seventeen patients (2.5%) were converted from HA to THA at an average of 1.9 years after index procedure. A significantly lower conversion rate of 1.4% (7/499 patients) was found in the older patient cohort (≥75 years old) compared to 5.3% (11/187) in the younger cohort. The most common causes for conversion surgery to THA were acetabular wear (5 patients), aseptic loosening (4 patients), and periprosthetic fracture (3 patients). There was a significantly lower rate of periprosthetic fracture (0.4% vs 2.5%, P value .025) in the cemented implant group compared to the cementless group. We observed a higher rate of dislocations in the bipolar vs unipolar group (3.8% vs 1%, P value .02) and no other significant differences between these groups. CONCLUSION We observed a low reoperation rate for this cohort of patients, relatively higher conversion rates for the younger population, fewer periprosthetic fractures with the use of cemented stems, and no advantage of bipolar over unipolar prostheses.
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Kim YH, Park JW, Kim JS. Alumina Delta-on-Highly Crosslinked-Remelted Polyethylene Bearing in Cementless Total Hip Arthroplasty in Patients Younger than 50 Years. J Arthroplasty 2016; 31:2800-2804. [PMID: 27378639 DOI: 10.1016/j.arth.2016.05.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/09/2016] [Accepted: 05/09/2016] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND The purpose of this retrospective study was to determine the clinical and radiographic results, prevalence of polyethylene wear and osteolysis, and fracture of alumina delta ceramic femoral head or highly crosslinked, remelted polyethylene (HXLPE) liner associated with the use of alumina delta ceramic femoral head-on-HXLPE bearing in cementless total hip arthroplasty in patients younger than 50 years. METHODS We reviewed the cases of 119 patients (130 hips) who underwent a cementless total hip arthroplasty using alumina delta ceramic-on-HXLPE bearing when they were 50 years or younger at the time of surgery. The most common diagnoses were osteonecrosis (51%) and osteoarthritis secondary to developmental dysplastic hip (39%). Osteolysis and polyethylene wear rates were evaluated with use of radiography and computed tomography. In addition, prevalence of fracture of alumina delta ceramic head and polyethylene line was documented. The mean follow-up was 8.3 years (range, 7-9 years). RESULTS The mean Harris hip score, Western Ontario and McMaster Universities Osteoarthritis Index score, University of California, Los Angeles activity score were 94 points, 14 points, and 8.1 points, respectively, at the final follow-up. No patient had thigh pain. All acetabular components and all but one femoral components were well fixed. The mean annual penetration rate of femoral head was 0.022 ± 0.003 mm/year. No hip had osteolysis or ceramic head or HXLPE liner fracture. CONCLUSION Our average 8.3-year results with the use of alumina delta ceramic-on-HXLPE bearing in the patients younger than 50 years suggest that cementless acetabular and femoral components provide a high survival rate without evidence of osteolysis or ceramic head or AXLPE liner fracture.
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MESH Headings
- Acetabulum/surgery
- Adult
- Aluminum Oxide
- Arthroplasty, Replacement, Hip/adverse effects
- Arthroplasty, Replacement, Hip/instrumentation
- Arthroplasty, Replacement, Hip/statistics & numerical data
- Ceramics
- Female
- Femur Head/surgery
- Femur Head Necrosis/surgery
- Follow-Up Studies
- Hip Dislocation, Congenital/complications
- Hip Prosthesis/statistics & numerical data
- Humans
- Male
- Middle Aged
- Osteoarthritis, Hip/etiology
- Osteoarthritis, Hip/surgery
- Osteolysis/diagnostic imaging
- Osteolysis/epidemiology
- Osteolysis/etiology
- Polyethylene
- Postoperative Complications/epidemiology
- Postoperative Complications/etiology
- Prosthesis Design
- Republic of Korea/epidemiology
- Retrospective Studies
- Tomography, X-Ray Computed
- Treatment Outcome
- Young Adult
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Puch JM, Derhi G, Descamps L, Verdier R, Caton JH. Dual-mobility cup in total hip arthroplasty in patients less than fifty five years and over ten years of follow-up : A prospective and comparative series. INTERNATIONAL ORTHOPAEDICS 2016; 41:475-480. [PMID: 27826763 DOI: 10.1007/s00264-016-3325-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 10/17/2016] [Indexed: 11/27/2022]
Abstract
PURPOSE We report clinical and radiological outcome of a dual mobility cup (DMC) of 2nd generation after a minimum of ten year-follow-up (FU). The goal of this work was to compare the results of this DMC in patients aged less than 55 years and in patients aged more than 55 years. METHODS From 2000 to 2005, a prospective and consecutive series of 119 THAs with a cementless DMC of 2nd generation (GIROS) were performed in patients aged less than 55 years and 444 in patients aged more than 55 years. RESULTS The mean FU was 11 years (8 to 15 years). Survivorships (failure of both components or cup loosening) were not different between patients aged less than 55 years and patients aged more than 55 years. There was no dislocation. DEVANE classification, Harris, PMA and Oxford scores improved after THA but no difference could be found between between < 55 years and > 55 years patients. CONCLUSION These results are better than those of first generation (BOUSQUET) DMC (77 % of survival rate at 20 years of FU). These results are in the same agreement than those of the literature: 99 % of survival rate at 14.2 years of FU for KERBOULL with a low friction arthroplasty and 96.5 % at ten years of FU for ceramic/ceramic bearing (R CHANA). The DMC for young patient is a relevant surgical option with no dislocation and excellent clinical results and survival rate at more than ten years of FU.
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Del Balso C, Teeter MG, Tan SC, Howard JL, Lanting BA. Trunnionosis: Does Head Size Affect Fretting and Corrosion in Total Hip Arthroplasty? J Arthroplasty 2016; 31:2332-6. [PMID: 27067470 DOI: 10.1016/j.arth.2016.03.009] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 03/02/2016] [Accepted: 03/04/2016] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Wear and tribocorrosion at the modular head-neck taper interface may be a cause of failure in metal-on-polyethylene total hip arthroplasty (THA). The present investigation endeavored to elucidate the effect of femoral head diameter on fretting and corrosion in retrieved head-neck tapers. METHODS A retrieval analysis of THA prostheses in vivo for a minimum of 1 year was performed. Twenty-three femoral heads of 32-mm diameter were matched with 28-mm heads based on time in vivo and head length (-3 mm to +8 mm). All included implants featured a single taper design from a single manufacturer. Fretting and corrosion damage scoring was performed for each implant under stereomicroscopic visualization. RESULTS Head diameter was observed to affect fretting (P = .01), with 32-mm femoral heads exhibiting greater total fretting scores than 28-mm heads. Fretting damage was greatest (P = .01) in the central concentric zone of the femoral head bore tapers, regardless of head diameter, length, or stem offset. No significant effect on total corrosion scores was observed for any head or stem variable. Retrieved implant total corrosion scores were positively correlated (ρ = 0.51, P < .001) with implantation time. CONCLUSION Increased femoral head diameter in THA may produce greater fretting damage owing to and increased head-neck moment arm. There is no associated increase in corrosion with 28-mm and 32-mm heads of this taper design. The longer a THA prosthesis is implanted, the greater the risk of damage due to corrosion.
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Kerger BD, Bernal A, Paustenbach DJ, Huntley-Fenner G. Halo and spillover effect illustrations for selected beneficial medical devices and drugs. BMC Public Health 2016; 16:979. [PMID: 27630095 PMCID: PMC5024505 DOI: 10.1186/s12889-016-3595-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 08/18/2016] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Negative news media reports regarding potential health hazards of implanted medical devices and pharmaceuticals can lead to a 'negative halo effect,' a phenomenon whereby judgments about a product or product type can be unconsciously altered even though the scientific support is tenuous. To determine how a 'negative halo effect' may impact the rates of use and/or explantation of medical products, we analyzed the occurrence of such an effect on three implanted medical devices and one drug: 1) intrauterine contraceptive devices (IUDs); 2) silicone gel-filled breast implants (SGBI); 3) metal-on-metal hip implants (MoM); and 4) the drug Tysabri. METHODS Data on IUD use from 1965 to 2008 were gathered from the Department of Health and Human Services Vital and Health Statistics and peer-reviewed publications. Data regarding SGBI implant and explantation rates from 1989 to 2012 were obtained from the Institute of Medicine and the American Society of Plastic Surgeons. MoM implant and explantation data were extracted from the England and Wales National Joint Registry and peer-reviewed publications. Tysabri patient data were reported by Elan Corporation or Biogen Idec Inc. Data trends for all products were compared with historical recall or withdrawal events and discussed in the context of public perceptions following such events. RESULTS We found that common factors altered public risk perceptions and patterns of continued use. First, a negative halo effect may be driven by continuing patient anxiety despite positive clinical outcomes. Second, negative reports about one product can spill over to affect the use of dissimilar products in the same category. Third, a negative halo effect on an entire category of medical devices can be sustained regardless of the scientific findings pertaining to safety. Fourth, recovery of a product's safety reputation and prevalent use may take decades in the U.S., even while these products may exhibit widespread use and good safety records in other countries. CONCLUSIONS We conclude that the 'negative halo effect' associated with a stigma, rather than an objective risk-benefit assessment of medical products can increase negative health outcomes for patients due to reduced or inappropriate product usage.
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Pijls BG, Meessen JMTA, Schoones JW, Fiocco M, van der Heide HJL, Sedrakyan A, Nelissen RGHH. Increased Mortality in Metal-on-Metal versus Non-Metal-on-Metal Primary Total Hip Arthroplasty at 10 Years and Longer Follow-Up: A Systematic Review and Meta-Analysis. PLoS One 2016; 11:e0156051. [PMID: 27295038 PMCID: PMC4905643 DOI: 10.1371/journal.pone.0156051] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Accepted: 05/09/2016] [Indexed: 11/19/2022] Open
Abstract
IMPORTANCE There are concerns about increased mortality in patients with metal-on-metal bearings in total hip arthroplasty (THA). OBJECTIVE To determine the mortality and the morbidity in patients with metal-on-metal articulations (MOM THA) compared to patients with non-metal-on-metal articulations (non-MOM THA) after primary total hip arthroplasty. DATA SOURCES Search of PubMed, MEDLINE, EMBASE, Web of Science, Cochrane, CINAHL, AcademicSearchPremier, ScienceDirect, Wiley and clinical trial registers through March 2015, augmented by a hand search of references from the included articles. No language restrictions were applied. STUDY SELECTION Two reviewers screened and identified randomised controlled trials and observational studies of primary total hip arthroplasty comparing MOM THA with non-MOM THA. DATA EXTRACTION AND SYNTHESIS Two reviewers independently extracted study data and assessed risk of bias. Risk differences (RD) were calculated with random effect models. Meta-regression was used to explore modifying factors. MAIN OUTCOMES AND MEASURES Difference in mortality and difference in morbidity expressed as revisions and medical complications between patients with MOM THA and non-MOM THA. RESULTS Forty-seven studies were included, comprising 4,000 THA in randomised trials and over 500,000 THA in observational studies. For mortality, random effects analysis revealed a higher pooled RD of 0.7%, 95%, confidence interval (CI) [0.0%, 2.3%], I-square 42%; the heterogeneity was explained by differences in follow-up. When restricted to studies with long term follow-up (i.e. 10 years or more), the RD for mortality was 8.5%, 95%, CI [5.8%, 11.2%]; number needed to treat was 12. Further subgroup analyses and meta-regression random effects models revealed no evidence for other moderator variables (study level covariates, e.g. resurfacing vs. non-resurfacing MOM) than follow-up duration. The quality of the evidence presented in this meta-analysis was characterized as moderate according to the CLEAR-NPT (for non-pharmacological trials) and Cochrane risk of bias Table. CONCLUSIONS AND RELEVANCE Meta-analysis suggests there may be an increased long-term risk of mortality and revision surgery for patients with MOM THA compared to patients with non-MOM THA. REGISTRATION PROSPERO 2014:CRD42014007417.
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Kolisek FR, Chughtai M, Mistry JB, Elmallah RK, Jaggard C, Malkani AL, Masini MA, Harwin SF, Mont MA. Outcomes of Second-Generation Tapered Wedge Femoral Stem. Surg Technol Int 2016; 28:275-279. [PMID: 27042781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
INTRODUCTION Newer generation cementless femoral stems have been designed to emulate more precisely the anatomy of the native femur. However, few studies have evaluated these designs. The purpose of this study was therefore to evaluate outcomes of primary total hip arthroplasty (THA) in patients who received a second-generation, tapered wedge stem by analyzing (1) all-cause and aseptic implant survivorships; (2) clinical and patient-reported outcomes; (3) radiographic outcomes; and (4) incidence of complications. MATERIALS AND METHODS We evaluated 202 primary THA patients (37% men, 63% women) who had a mean age of 63 years (range, 18 to 88) and a mean body mass index (BMI) of 29 (range, 18 to 40). All patients underwent THA using a press-fit, tapered wedge stem with a morphometric design containing a size-specific medial curvature, which optimizes initial press-fit stability. Kaplan-Meier analysis was performed to determine implant survivorship, and Harris Hip Scores (HHS) and the Short form-36 (SF-36) were used to evaluate clinical and patient-reported outcomes. Early postoperatively and annually thereafter, pelvic radiographs were reviewed for evidence of osteolysis or loosening. Complications were identified through a comprehensive chart review and were classified as either surgical or medical. RESULTS At final follow-up, the all-cause and aseptic survivorships for the femoral stem were 99.5% and 100%, respectively. At final follow-up, the mean HHS was 87 (range, 35 to 100). The SF-36 mental and physical component scores were 47 (range, 19 to 65) and 47 (range, 23 to 65), respectively, at final follow-up. No progressive radiolucencies or loosening were observed. Surgical complications included nerve palsy, posterior trochanteric avulsion, arthrofibrosis, and periprosthetic fracture. The only medical complication was acute renal failure. CONCLUSION This second-generation stem demonstrated excellent short-term survivorship and functional outcomes. The improved patient fit of this stem may yield continued favorable results with longer-term follow-up.
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Wu X, He BX, Tan YJ. [Progress on classification and application of artificial hip joint materials]. ZHONGGUO GU SHANG = CHINA JOURNAL OF ORTHOPAEDICS AND TRAUMATOLOGY 2016; 29:283-288. [PMID: 27149804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The selection of the prosthetic material determine the success or failure of hip arthroplasty. Currently, the metals, ceramics, polymer composites and carbon materials are the main prosthetic materials of artificial hip joint. They have some progresses in biocompatibility, elastic modulus,mechanical properties, useful life, but they still can't reach the ideal standard of design. In this essay, we mainly review the characteristics and applications of the current artificial hip joint materials through its classification in order to provide a reference for choosing appropriate hip joint materials in clinic and increasing characteristic of materials. We consider the polymer composites has more advantages such as biocompatibility, mechanical properties, corrosion resistance and price, even if it has shortages in abrasion resistance. As the researches of polymer composites are main focus on abrasion resistance, articular surface and strength,and its performances are increased fast, it has a wide prospect in future.
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So K, Goto K, Kuroda Y, Matsuda S. Minimum 10-Year Wear Analysis of Highly Cross-Linked Polyethylene in Cementless Total Hip Arthroplasty. J Arthroplasty 2015; 30:2224-6. [PMID: 26231076 DOI: 10.1016/j.arth.2015.06.053] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 06/21/2015] [Accepted: 06/25/2015] [Indexed: 02/01/2023] Open
Abstract
Fifty-four patients (64 hips) underwent cementless total hip arthroplasty between 2000 and 2003 with a 22-mm zirconia ceramic bearing on highly cross-linked polyethylene, and were evaluated with a mean 11.9-year postoperative follow-up (range, 10-14 years). Linear wear was measured on the anteroposterior radiograph of the hip. No evidence of osteolysis and loosening was found on the final radiograph in any of the cases, and the steady-state linear wear rate was 0.017±0.018 mm/year. No significant correlation was found between the linear wear rate and age, body weight, cup inclination angle, or polyethylene thickness. Highly cross-linked polyethylene showed excellent wear resistance for >10 years when used in combination with 22-mm zirconia heads.
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Jameson SS, Mason J, Baker PN, Gregg PJ, Deehan DJ, Reed MR. Implant Optimisation for Primary Hip Replacement in Patients over 60 Years with Osteoarthritis: A Cohort Study of Clinical Outcomes and Implant Costs Using Data from England and Wales. PLoS One 2015; 10:e0140309. [PMID: 26561859 PMCID: PMC4643061 DOI: 10.1371/journal.pone.0140309] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 09/24/2015] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Hip replacement is one of the most commonly performed surgical procedures worldwide; hundreds of implant configurations provide options for femoral head size, joint surface material and fixation method with dramatically varying costs. Robust comparative evidence to inform the choice of implant is needed. This retrospective cohort study uses linked national databases from England and Wales to determine the optimal type of replacement for patients over 60 years undergoing hip replacement for osteoarthritis. METHODS AND FINDINGS Implants included were the commonest brand from each of the four types of replacement (cemented, cementless, hybrid and resurfacing); the reference prosthesis was the cemented hip procedure. Patient reported outcome scores (PROMs), costs and risk of repeat (revision) surgery were examined. Multivariable analyses included analysis of covariance to assess improvement in PROMs (Oxford hip score, OHS, and EQ5D index) (9159 linked episodes) and competing risks modelling of implant survival (79,775 procedures). Cost of implants and ancillary equipment were obtained from National Health Service procurement data. RESULTS EQ5D score improvements (at 6 months) were similar for all hip replacement types. In females, revision risk was significantly higher in cementless hip prostheses (hazard ratio, HR = 2.22, p<0.001), when compared to the reference hip. Although improvement in OHS was statistically higher (22.1 versus 20.5, p<0.001) for cementless implants, this small difference is unlikely to be clinically important. In males, revision risk was significantly higher in cementless (HR = 1.95, p = 0.003) and resurfacing implants, HR = 3.46, p<0.001), with no differences in OHS. Material costs were lowest with the reference implant (cemented, range £1103 to £1524) and highest with cementless implants (£1928 to £4285). Limitations include the design of the study, which is intrinsically vulnerable to omitted variables, a paucity of long-term implant survival data (reflecting the duration of data collection), the possibility of revision under-reporting, response bias within PROMs data, and issues associated with current outcome scoring systems, which may not accurately reflect level of improvement in some patients. CONCLUSIONS Cement fixation, using a polyethylene cup and a standard sized head offers good outcomes, with the lowest risks and at the lowest costs. The most commonly used cementless and resurfacing implants were associated with higher risk of revision and were more costly, while perceptions of improved function and longevity were unsupported.
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Boldt JG, Cartillier JC, Machenaud A, Vidalain JP. Long-term Bone Remodeling in HA-coated Stems: A Radiographic Review of 208 Total Hip Arthroplasties (THAs) with 15 to 20 Years Follow-up. Surg Technol Int 2015; 27:279-286. [PMID: 26680411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present a prospective study focused on radiographic long-term outcomes and bone remodeling at a mean of 17.0 years (range: 15 to 20) in 208 cementless fully HA-coated femoral stems (Corail, DePuy International Ltd, Leeds, UK). Total hip replacements in this study were performed by three members of the surgeon design group between 1986 and 1991. Radiographic evaluation focused on periprosthetic osteolysis, bone remodeling, osseous integration, subsidence, metaphyseal or diaphyseal load transfer, and femoral stress shielding. The radiographs were digitized and examined with contrast-enhancing software for analysis of the trabecular architecture. Radiographic signs of aseptic stem loosening were visible in two cases (1%). Three stems (1.4%) showed metaphyseal periprosthetic osteolysis in four of seven Gruen zones associated with eccentric polyethylene wear awaiting metaphyseal bone grafting and cup liner exchange. One stem (0.5%) was revised due to infection. No stem altered in varus or valgus alignment more than two degrees, and mean subsidence was 0.1 mm (range: 0 to 2 mm) after a mean of 17.0 years. A total of 5 stems (2.4%) required or are awaiting revision surgery. Trabecular orientation and micro-anatomy suggested main proximal load-transfer patterns in all except 3 cases (98.6%). Combined metaphyseal and diaphyseal osseointegration and bone remodeling were visible in 100 stems (48%). Diaphyseal stress shielding and cortical thickening were observed in 3 stems (1.4%). Other radiographic features are discussed in depth. This long-term study of 208 fully HA-coated Corail stems showed satisfactory osseointegration and fixation in 203 cases (97.6%) after a mean of 17.0 years follow-up. Stem failures were associated with extreme eccentric polyethylene wear.
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Elmallah RK, Cherian JJ, Amin H, Jauregui JJ, Pierce TP, Mont MA. Readmission Rates in Patients Who Underwent Total Hip Arthroplasty. Surg Technol Int 2015; 27:215-217. [PMID: 26680400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Readmission rates remain a concern following total hip arthroplasty (THA). This study: 1) evaluated 30-day, 90-day, and total readmission rates after THAs; 2) assessed causes of readmission; 3) determined differences in demographic factors between those who were and were not readmitted; and 4) compared readmission rates to other large-scale studies. We retrospectively reviewed 232 primary THAs (224 patients) using the same prosthesis at 7 institutions. This included 79 men and 145 women who had a mean age of 69 years (range, 44 to 88). Descriptive analyses were used to evaluate readmission, and rates were compared with those from large cohort studies. There were 11 unplanned readmissions (4.7%) in 10 patients during the first 90 days post-discharge. Seven (3%) readmissions were due to surgical and 4 (1.7%) were due to medical reasons. Surgical causes were found in 70% of early (0 to 30 days) readmissions but none of late (60 to 90 days) readmissions. No differences existed in mean age, gender, and body mass index between readmitted patients and the remainder of the population. We observed lower readmission rates when compared with large cohort studies. The positive performance of the prosthesis may have contributed to the lower readmission rates.
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Berend KR, Adams JB, Morris MJ, Lombardi AV. Early Experience with a New Porous Hemispheric Acetabular Component. Surg Technol Int 2015; 27:263-267. [PMID: 26680408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A third-generation cementless acetabular system has been designed, building on the successes of a second-generation system that featured good congruity between the liner and hemispheric shell, and proven porous plasma-sprayed coating on titanium alloy substrate, by designing a ringless barb and groove locking mechanism and optimizing range of motion. These design features are amenable to modern, highly crosslinked polyethylenes. A retrospective review was performed to assess early outcomes. A query of our practice registry revealed 534 patients (576 hips) who underwent cementless total hip arthroplasty performed by three surgeons with the G7™ Acetabular System (Biomet, Warsaw, Indiana) between April 2013 and March 2014. All liners were vitamin E infused, highly crosslinked polyethylene with a neutral face. Heads used were 463 BIOLOX® delta (81%; CeramTec AG, Plochingen, Germany) and 112 cobalt-chromium (19%), with diameters of 32 mm in 238 (41%), 36 mm in 331 (58%), and 40 mm in 6. Minimum one-year follow-up was available for 400 hips. Mean follow-up was 15 months (range 10-24, SD 3.0). Harris hip scores improved from 50.7 preoperatively to 86.5 most recently. UCLA activity scale improved from 4.5 preoperatively to 5.4 most recently. Two patients required cup revision secondary to failure of biological fixation at 8.4 and 15.1 months respectively. Radiographic findings in all cases were satisfactory position and alignment with no radiolucencies observed. In this group, with very early follow-up, good results with a low rate of acetabular revision and no dislocations were achieved using a new hemispheric porous shell with ringless barb and groove locking mechanism and geometry.
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Scaglione M, Fabbri L, Bianchi N, Dell'Omo D, Guido G. Metal-on-metal hip resurfacing: correlation between clinical and radiological assessment, metal ions and ultrasound findings. Musculoskelet Surg 2015; 99:45-53. [PMID: 25537299 DOI: 10.1007/s12306-014-0344-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Accepted: 12/05/2014] [Indexed: 06/04/2023]
Abstract
PURPOSE We report the clinical, radiological and wear analysis of 52 consecutive MoM hip resurfacings (performed on 49 younger patients) to a mean follow-up of 9.2 years. METHODS Every patient underwent X-ray and clinical evaluation (HHS). Ultrasonography of the hip was performed in all patients in order to identify possible cystic or solid mass in periprosthetic tissue. In case of mass >20 mm, further MRI was performed to better analyse the characteristics of lesion. RESULTS Five patients (five hips) had a revision. The overall survival rate was 90.38 %. The average HHS at follow-up examination was 95.5 points. No progressive radiolucent areas and no sclerosis or osteolysis around the implants were found. The US and RMI imaging showed a pseudotumour formation in two patients (correlated with high metal ion levels in blood and urine), both asymptomatic. CONCLUSION A significant positive correlation between inclination of the acetabular component and serum metal ion levels was found (r = 0.64 and r = 0.62 for cobalt and chromium, respectively).
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Mäkelä KT, Matilainen M, Pulkkinen P, Fenstad AM, Havelin LI, Engesaeter L, Furnes O, Overgaard S, Pedersen AB, Kärrholm J, Malchau H, Garellick G, Ranstam J, Eskelinen A. Countrywise results of total hip replacement. An analysis of 438,733 hips based on the Nordic Arthroplasty Register Association database. Acta Orthop 2014; 85:107-16. [PMID: 24650019 PMCID: PMC3967250 DOI: 10.3109/17453674.2014.893498] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 01/03/2014] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND AND PURPOSE An earlier Nordic Arthroplasty Register Association (NARA) report on 280,201 total hip replacements (THRs) based on data from 1995-2006, from Sweden, Norway, and Denmark, was published in 2009. The present study assessed THR survival according to country, based on the NARA database with the Finnish data included. MATERIAL AND METHODS 438,733 THRs performed during the period 1995-2011 in Sweden, Denmark, Norway, and Finland were included. Kaplan-Meier survival analysis was used to calculate survival probabilities with 95% confidence interval (CI). Cox multiple regression, with adjustment for age, sex, and diagnosis, was used to analyze implant survival with revision for any reason as endpoint. RESULTS The 15-year survival, with any revision as an endpoint, for all THRs was 86% (CI: 85.7-86.9) in Denmark, 88% (CI: 87.6-88.3) in Sweden, 87% (CI: 86.4-87.4) in Norway, and 84% (CI: 82.9-84.1) in Finland. Revision risk for all THRs was less in Sweden than in the 3 other countries during the first 5 years. However, revision risk for uncemented THR was less in Denmark than in Sweden during the sixth (HR = 0.53, CI: 0.34-0.82), seventh (HR = 0.60, CI: 0.37-0.97), and ninth (HR = 0.59, CI: 0.36-0.98) year of follow-up. INTERPRETATION The differences in THR survival rates were considerable, with inferior results in Finland. Brand-level comparison of THRs in Nordic countries will be required.
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Vavřík P, Landor I, Popelka S, Fialka R, Hach J. The National Register of Joint Replacements of the Czech Republic. ACTA CHIRURGIAE ORTHOPAEDICAE ET TRAUMATOLOGIAE CECHOSLOVACA 2014; 81 Suppl:3-68. [PMID: 25105887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The National Register of Joint Replacements of the Czech Republic was established as part of the National Health Information System in 2002. The register's administrator is the Institute of Health Information and Statistics of the Czech Republic, the Czech Society for Orthopaedics and Traumatology acts as its guarantor of scientific quality. The register is financed from governmental sources. It was launched into full operation in 2003 and it currently focuses on hip joint replacements. Register of knee and shoulder joint replacements is in the process of preparation. The register provides aggregate epidemiological data and other statistics, including the Revision Rate (RR) and curves of cumulative survival probability (Kaplan-Meier) for the main monitored groups of patients and implants used. In years 2003-2012 there were 101,734 primary implantations and 13,459 revision surgeries registered. In terms of gender distribution there is a predominance of females amounting to 59.4% in primary implantations and to 63.49% in revision surgeries. The age structure covers the entire range of adult population; however, more than 50% of the replacements are being implanted between 60-74 years of age. Most frequent indications for primary implantation are primary coxarthrosis (69.85%), post-fracture conditions (13.41%) and post-dysplasia arthritis (8.73%). The most frequent indications for revision surgery are aseptic loosening of acetabular component (38.15%), aseptic loosening of femoral component (22.01%) and recurrent dislocation (6.5%). 45,450 (44.68%) of primary implantations were cemented, 36,477 (35.86%) uncemented, 16,559 (16.28%) hybrid with cemented femur and 656 (0.64%) hybrid with cemented acetabulum. There were also records of 2,592 cervicocapital prostheses (2.55%). Most commonly used is the classic anterolateral approach 75.86% in primary implantations and 50.06% in revision surgeries. Mini-invasive approaches in primary implantations did not exceed 3.2% of all cases. Bone grafts were used in 23.89% of primary implantations and 39.55% of revisions. Most widely used implants in primary implantations were cemented PE cup type Muller (Aesculap) 14,000 pcs, original Czech cemented steel Stem with conical neck 12/14 AK (Beznoska) 13,433 pcs, from uncemented models Plasmacup SC (Aesculap) 9,762 pcs and Stem SL "Zweymüller Alloclassic" (Zimmer) 4,337 pcs. Generally most widely used implants in revision surgeries are uncemented Czech Oval cup MO (Medin) with titanium & hydroxyapatite porous coat 956 pcs and uncemented Stem SL WAGNER, lateralised, cone 12/14 (Zimmer) 712 pcs. The Revision Rate for primary implants due to infection for period 2003-2012 represented 0.06% at the end of the followup as of June 30, 2013. Cumulative survival probability (Kaplan-Meier) in year 11 of the follow-up is 95.69% in cemented implants, 94.55% in uncemented, 92.90% in hybrids with cemented femur and 84.11% in hybrids with cemented cup.
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Ulrich M, Overgaard S, Penny J. [Metal-on-metal hip arthroplasty]. Ugeskr Laeger 2014; 176:V04130235. [PMID: 25293565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In Denmark 4,456 metal-on-metal (MoM) hip prostheses have been implanted. Evidence demonstrates that some patients develope adverse biological reactions causing failures of MoM hip arthroplasty. Some reactions might be systemic. Failure rates are associated with the type and the design of the MoM hip implant. A Danish surveillance programme has been initiated addressing these problems.
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Philippot R, Meucci JF, Boyer B, Farizon F. Modern dual-mobility cup implanted with an uncemented stem: about 100 cases with 12-year follow-up. Surg Technol Int 2013; 23:208-212. [PMID: 23686801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report the results of a 12-year follow-up retrospective series of 100 total hip arthroplasties using cementless, press-fit, dual-mobility acetabular cups. The aim of our study was to evaluate the clinical and radiographic results of this acetabular cup at last follow-up. This continuous and homogeneous series included 100 primary total hip arthroplasties performed during the year 2000. The THA combined a Corail® stem (Corail®, Depuy, Warsaw, IN) with a stainless steel Novae Sunfit® (Serf, Decines, France) acetabular cup. Fifteen patients died and 2 were lost to follow-up. Two cases of early dislocation were observed, and 3 cases of aseptic loosening of the acetabular component were reported. The mean stem subsidence was 0.71 mm, the mean craniopodal acetabular migration was 1.37 mm, and the mean medio-lateral acetabular migration was 1.52 mm. The 12-year survivorship is comparable to the data from the literature. The low dislocation rate at 12 years confirms the long-term, high stability of dual mobility, which should be recommended in primary THA for patients at risk for postoperative instability. The absence of true intraprosthetic dislocation events at 12-year follow-up provides evidence of the good quality of the latest generation of polyethylene liners and the necessity of combining thin-mirror, polished femoral necks with dual-mobility cups.
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