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Miyamoto S, Iida S, Suzuki C, Kawamoto T, Shinada Y, Ohtori S. Minimum 10-Year Follow-Up of Total Hip Arthroplasty With a Collarless Triple-Tapered Polished Cemented Stem With Line-to-Line Implantation Using a Direct Anterior Approach. J Arthroplasty 2022; 37:2214-2224. [PMID: 35588903 DOI: 10.1016/j.arth.2022.05.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 05/01/2022] [Accepted: 05/11/2022] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND The Trilliance stem (B. Braun-Aesculap, Tuttlingen, Germany), a novel collarless triple-tapered polished stem, was introduced in 2009. The aim of this study is to evaluate the long-term clinical and radiological results of the Trilliance stem with line-to-line implantation in primary total hip arthroplasty using a direct anterior approach. METHODS A consecutive retrospective series of 130 patients (151 hips) who underwent total hip arthroplasty between February 2009 and August 2011 were evaluated for a minimum of 10 years. Of these, 87.4% had a diagnosis of secondary osteoarthritis based on developmental hip dysplasia. Clinical and radiological results, complications were evaluated and survival analysis was performed. RESULTS The mean follow-up was 10.7 years (range, 10.0-12.1). Thirteen hips (13 patients, 6.8%) were lost to follow-up. Adequate cementation (Barrack grade A) was achieved in 136 hips (93.8%) 1 week post-operatively. Nearly all (144 hips, 99.3%) had been inserted within the range of 3°. No significant differences were identified between high- (≥30 procedures/year) and low- (<30 procedures/year) volume surgeons. The Kaplan-Meier survival analysis with revision of the femoral component for aseptic loosening, revision of the femoral component for any reason and revision of either component for any reason as the end points, cumulative survivorship was 100.0%, 97.6% (95% confidence interval (CI) 95.4-100.0) and 96.5% (95% CI 93.8-99.3) at 10 years, respectively. CONCLUSION The Trilliance stem with line-to-line implantation using a direct anterior approach has an excellent clinical and radiological outcome at a minimum of 10 years' follow-up. LEVEL OF EVIDENCE Level IV, Retrospective cohort study.
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Affiliation(s)
- Shuichi Miyamoto
- Department of Orthopedic Surgery, Matsudo City General Hospital, Chiba, Japan
| | - Satoshi Iida
- Department of Orthopedic Surgery, Matsudo City General Hospital, Chiba, Japan
| | - Chiho Suzuki
- Department of Orthopedic Surgery, Matsudo City General Hospital, Chiba, Japan
| | - Taisei Kawamoto
- Department of Orthopedic Surgery, Matsudo City General Hospital, Chiba, Japan
| | - Yoshiyuki Shinada
- Department of Orthopedic Surgery, Matsudo City General Hospital, Chiba, Japan
| | - Seiji Ohtori
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan
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2
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Sevaldsen K, Schnell Husby O, Lian ØB, Farran KM, Schnell Husby V. Is the French Paradox cementing philosophy superior to the standard cementing? A randomized controlled radiostereometric trial and comparative analysis. Bone Joint J 2022; 104-B:19-26. [PMID: 34969272 PMCID: PMC8779947 DOI: 10.1302/0301-620x.104b1.bjj-2021-0325.r2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Aims Highly polished stems with force-closed design have shown satisfactory clinical results despite being related to relatively high early migration. It has been suggested that the minimal thickness of cement mantles surrounding the femoral stem should be 2 mm to 4 mm to avoid aseptic loosening. The line-to-line cementing technique of the femoral stem, designed to achieve stem press-fit, challenges this opinion. We compared the migration of a highly polished stem with force-closed design by standard and line-to-line cementing to investigate whether differences in early migration of the stems occur in a clinical study. Methods In this single-blind, randomized controlled, clinical radiostereometric analysis (RSA) study, the migration pattern of the cemented Corail hip stem was compared between line-to-line and standard cementing in 48 arthroplasties. The primary outcome measure was femoral stem migration in terms of rotation and translation around and along with the X-, Y-, and Z- axes measured using model-based RSA at three, 12, and 24 months. A linear mixed-effects model was used for statistical analysis. Results Results from mixed model analyses revealed a lower mean retroversion for line-to-line (0.72° (95% confidence interval (CI) 0.38° to 1.07°; p < 0.001), but no significant differences in subsidence between the techniques (-0.15 mm (95% CI -0.53 to 0.227; p = 0.429) at 24 months. Radiolucent lines measuring < 2 mm wide were found in three and five arthroplasties cemented by the standard and line-to-line method, respectively. Conclusion The cemented Corail stem with a force-closed design seems to settle earlier and better with the line-to-line cementing method, although for subsidence the difference was not significant. However, the lower rate of migration into retroversion may reduce the wear and cement deformation, contributing to good long-term fixation and implant survival. Cite this article: Bone Joint J 2022;104-B(1):19–26.
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Affiliation(s)
- Kirsti Sevaldsen
- Department of Orthopaedic Surgery, Kristiansund Hospital, Kristiansund, Norway.,Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, Norwegian University of Science and Technology, Trondheim, Norway
| | - Otto Schnell Husby
- Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, Norwegian University of Science and Technology, Trondheim, Norway.,Clinic of Orthopaedics, Rheumatology and Dermatology, Department of Orthopaedic Surgery, St. Olav's University Hospital, Trondheim, Norway
| | - Øystein Bjerkestrand Lian
- Department of Orthopaedic Surgery, Kristiansund Hospital, Kristiansund, Norway.,Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Science, Norwegian University of Science and Technology, Trondheim, Norway
| | | | - Vigdis Schnell Husby
- Clinic of Orthopaedics, Rheumatology and Dermatology, Department of Orthopaedic Surgery, St. Olav's University Hospital, Trondheim, Norway.,Department of Health Science, Faculty of Medicine and Health Science, Norwegian University of Science and Technology, Ålesund, Norway
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Baryeh K, Mendis J, Sochart DH. Temporal subsidence patterns of cemented polished taper-slip stems: a systematic review. EFORT Open Rev 2021; 6:331-342. [PMID: 34150327 PMCID: PMC8183154 DOI: 10.1302/2058-5241.6.200086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The literature was reviewed to establish the levels of stem subsidence for both double and triple-tapered implants in order to determine whether there were any differences in subsidence levels with regard to the methods of measurement, the magnitude and rate of subsidence and clinical outcomes. All studies reporting subsidence of polished taper-slip stems were identified. Patient demographics, implant design, radiological findings, details of surgical technique, methods of measurement and levels of subsidence were collected to investigate which factors were related to increased subsidence. Following application of inclusion and exclusion criteria, 28 papers of relevance were identified. The studies initially recruited 3090 hips with 2099 being available for radiological analysis at final follow-up. Patient age averaged 68 years (42–70), 60.4% were female and the average body mass index (BMI) was 27.4 kg/m2 (24.1–29.2). Mean subsidence at one, two, five and 10 years was 0.97 mm, 1.07 mm, 1.47 mm and 1.61 mm respectively. Although double-tapered stems subsided more than triple-tapered stems at all time points this was not statistically significant (p > 0.05), nor was the method of measurement used (p > 0.05). We report the levels of subsidence at which clinical outcomes and survivorship remain excellent, but based on the literature it was not possible to determine a threshold of subsidence beyond which failure was more likely. There were relatively few studies of triple-tapered stems, but given that there were no statistically significant differences, the levels presented in this review can be applied to both double and triple-tapered designs.
Cite this article: EFORT Open Rev 2021;6:331-342. DOI: 10.1302/2058-5241.6.200086
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Affiliation(s)
- Kwaku Baryeh
- The Academic Surgical Unit, South West London Elective Orthopaedic Centre, UK
| | | | - David H Sochart
- The Academic Surgical Unit, South West London Elective Orthopaedic Centre, UK
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Richardson CG, Laende EK, Gross M, Dunbar MJ. Prospective clinical study using radiostereometric analysis (RSA) to evaluate fixation of a modular cemented polished femoral stem. Hip Int 2021; 31:191-195. [PMID: 31615281 DOI: 10.1177/1120700019881429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND The long-term clinical success of cemented polished tapered femoral components has been demonstrated in prospective as well as registry studies. This stem design type has also been well studied with radiostereometric analysis (RSA) and provides a standard to evaluate alternative designs of polished tapered cemented femoral components. This prospective study evaluates the subsidence of a polished cemented stem with a modular neck design utilising RSA. METHODS 26 patients were prospectively enrolled in the study and 23 were available for RSA analysis at 2 years. RESULTS The average subsidence of the femoral implant was 1.1 mm (SD 0.4 mm) at 2 years post operation. There were no revisions in this group, specifically no failures of the modular stem-neck design as has been seen with other implants. CONCLUSIONS The RSA subsidence pattern at 2 years of this cemented femoral stem is similar to other successful designs with long-term follow-up. The implications over time of stem neck modularity for cemented polished tapered femoral components requires further evaluation.
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Affiliation(s)
- C Glen Richardson
- Division of Orthopaedics, Department of Surgery, Dalhousie University and QEII Health Sciences Centre, Nova Scotia Health Authority, Halifax, Nova Scotia, Canada
| | - Elise K Laende
- Division of Orthopaedics, Department of Surgery, Dalhousie University and QEII Health Sciences Centre, Nova Scotia Health Authority, Halifax, Nova Scotia, Canada.,School of Biomedical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Michael Gross
- Division of Orthopaedics, Department of Surgery, Dalhousie University and QEII Health Sciences Centre, Nova Scotia Health Authority, Halifax, Nova Scotia, Canada
| | - Michael J Dunbar
- Division of Orthopaedics, Department of Surgery, Dalhousie University and QEII Health Sciences Centre, Nova Scotia Health Authority, Halifax, Nova Scotia, Canada.,School of Biomedical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada
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Miyamoto S, Iida S, Suzuki C, Kawarai Y, Nakatani T, Nakamura J, Orita S, Ohtori S. Postoperative migration of the anatomical and functional anteversion angle following total hip arthroplasty with a well-fixed cemented femoral component with line-to-line implantation. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY 2020; 30:1067-1074. [PMID: 32314066 DOI: 10.1007/s00590-020-02671-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 04/07/2020] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Little is known about the association between well-fixed polished tapered cemented stems (PTCS) implanted by the line-to-line technique and changes of stem migration, or the change of functional anteversion of the femur after total hip arthroplasty (THA). MATERIALS AND METHODS This retrospective study included 422 two-stage bilateral primary THAs performed using PTCS implanted by the line-to-line technique. CT scans were made on both the target side (first postoperative CT) and on the contralateral side (second postoperative CT) 1 week postoperatively. The mean follow-up was 7.8 months. CT data for each scan were transferred to 3D template software (Zed hip, Lexi, Japan). The postoperative changes of anatomical stem anteversion (ASA), functional femoral anteversion (FFA), and stem subsidence were evaluated. RESULTS A total of 20 THAs with CT scans were available on 3D template software. The ASA and the FFA had migrated - 0.68° ± 0.62° and - 5.5° ± 9.7°, respectively, over the follow-up period. A significant positive correlation was observed between the change of subsidence and ASA (r2 = 0.34, p = 0.007), between the FFA on the second postoperative CT and ASA on the first postoperative CT (r2 = 0.26, p = 0.02) and between the FFA on the second postoperative CT and FFA on the first postoperative CT (r2 = 0.52, p = 0.0003). CONCLUSION This study indicates that the change in axial rotation of a PTCS implanted by the line-to-line technique was less than that reported by other studies and the preoperative external rotation contracture was substantially improved after THA.
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Affiliation(s)
- Shuichi Miyamoto
- Matsudo City General Hospital, 993-1 Sendabori, Matsudo, Chiba, 270-2296, Japan.
| | - Satoshi Iida
- Matsudo City General Hospital, 993-1 Sendabori, Matsudo, Chiba, 270-2296, Japan
| | - Chiho Suzuki
- Matsudo City General Hospital, 993-1 Sendabori, Matsudo, Chiba, 270-2296, Japan
| | - Yuya Kawarai
- Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan
| | - Takushi Nakatani
- Matsudo City General Hospital, 993-1 Sendabori, Matsudo, Chiba, 270-2296, Japan
| | - Junichi Nakamura
- Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan
| | - Sumihisa Orita
- Center for Advanced Joint Function and Reconstructive Spine Surgery Graduate School of Medicine, Chiba University, 1-8-1 Inohana Chuo-ku, Chiba, 260-8670, Japan
| | - Seiji Ohtori
- Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan
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Cassar-Gheiti AJ, McColgan R, Kelly M, Cassar-Gheiti TM, Kenny P, Murphy CG. Current concepts and outcomes in cemented femoral stem design and cementation techniques: the argument for a new classification system. EFORT Open Rev 2020; 5:241-252. [PMID: 32377392 PMCID: PMC7202038 DOI: 10.1302/2058-5241.5.190034] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Cemented implant fixation design principles have evolved since the 1950s, and various femoral stem designs are currently in use to provide a stable construct between the implant-cement and cement-bone interfaces.Cemented stems have classically been classified into two broad categories: taper slip or force closed, and composite beams or shaped closed designs. While these simplifications are acceptable general categories, there are other important surgical details that need to be taken into consideration such as different broaching techniques, cementing techniques and mantle thickness.With the evolution of cemented implants, the introduction of newer implants which have hybrid properties, and the use of different broaching techniques, the classification of a very heterogenous group of implants into simple binary categories becomes increasingly difficult. A more comprehensive classification system would aid in comparison of results and better understanding of the implants' biomechanics.We review these differing stem designs, their respective cementing techniques and geometries. We then propose a simple four-part classification system and summarize the long-term outcomes and international registry data for each respective type of cemented prosthesis. Cite this article: EFORT Open Rev 2020;5:241-252. DOI: 10.1302/2058-5241.5.190034.
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Affiliation(s)
| | | | - Martin Kelly
- Connolly Hospital, Orthopaedic Department, Dublin, Ireland
| | | | - Paddy Kenny
- Cappagh National Orthopaedic Hospital, Dublin, Ireland
- Connolly Hospital, Orthopaedic Department, Dublin, Ireland
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7
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Jørgensen PB, Lamm M, Søballe K, Stilling M. Equivalent hip stem fixation by Hi-Fatigue G and Palacos R + G bone cement: a randomized radiostereometric controlled trial of 52 patients with 2 years' follow-up. Acta Orthop 2019; 90:237-242. [PMID: 30931663 PMCID: PMC6534245 DOI: 10.1080/17453674.2019.1595390] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Background and purpose - Long-term fixation of cemented femoral stems relies on several factors including cement adhesion and fatigue. Hi-Fatigue is a newer third-generation bone cement with low-viscosity properties at room temperature, good mechanical strength, and stable bone-cement interface in a laboratory testing environment. Palacos bone cement has excellent 10-year survival and is considered gold standard. We compared stem subsidence after fixation with Hi-Fatigue and Palacos bone cements using radiostereometry. Patients and methods - In a patient-blinded randomized controlled trial, 52 patients (30 women) at mean age 76 years (71-87) with osteoarthrosis and no osteoporosis received Hi-Fatigue G or Palacos R + G cement fixation of collarless, polished, double-tapered stems (CPT). Tantalum beads were inserted in the periprosthetic bone. Supine stereoradiographs were obtained postoperatively, 3 months, 6 months, 1 year, and 2 years after surgery. Oxford Hip Score (OHS) and VAS pain were recorded preoperatively and 1 and 2 years after surgery. Cement working times and properties were registered. Results - At 2 years, mean stem subsidence of 1.12 mm (95% CI 0.96-1.29) for Hi-Fatigue and 1.19 mm (CI 1.03-1.34) for Palacos was similar. Likewise, stem version was comparable between cement groups. Mean OHS and VAS pain were similar between cement groups. Cement working times were similar between cement groups, but the mean curing time was longer for Hi-Fatigue (13.7 min) than for Palacos (11.6 min). Interpretation - We found similar and generally low migration of CPT femoral stems inserted with Hi-Fatigue and Palacos bone cement until 2 years' follow-up, which indicates a good long-term survival of polished taper femoral stems inserted with both cement types.
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Affiliation(s)
- Peter B Jørgensen
- Department of Orthopedic Surgery, Aarhus University Hospital;; ,Department of Clinical Medicine, Aarhus University, Denmark,Correspondence:
| | - Martin Lamm
- Department of Orthopedic Surgery, Aarhus University Hospital;;
| | - Kjeld Søballe
- Department of Orthopedic Surgery, Aarhus University Hospital;; ,Department of Clinical Medicine, Aarhus University, Denmark
| | - Maiken Stilling
- Department of Orthopedic Surgery, Aarhus University Hospital;; ,Department of Clinical Medicine, Aarhus University, Denmark
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Sesselmann S, Hong Y, Schlemmer F, Wiendieck K, Söder S, Hussnaetter I, Müller LA, Forst R, Wierer T. Migration measurement of the cemented Lubinus SP II hip stem - a 10-year follow-up using radiostereometric analysis. ACTA ACUST UNITED AC 2017; 62:271-278. [PMID: 27416615 DOI: 10.1515/bmt-2015-0172] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Accepted: 06/20/2016] [Indexed: 12/22/2022]
Abstract
In a previous radiostereometric analysis (RSA) of the Lubinus SP II (Link, Hamburg, Germany), which is one of the most often used cemented hip stems worldwide, our research group detected a very small but statistically significant distal migration of -0.03±0.17 mm 2 years after surgery compared to the postoperative radiograph. Maximum subsidence occurred between 6 and 12 months. The implant appeared to have stabilized after 2 years. The mean value of maximum total point motion (MTPM) was 0.99±0.69 mm, which was detected 2 years after surgery. The purpose of this study was to analyze the migration pattern and to verify the predictive value of short-term RSA of the Lubinus SP II stem after 10 years. After a follow-up of 5 and 10 years, 38 and 27 out of 100 patients remained available for further assessment, respectively. No statistically significant implant translation or rotation was found along or about the axes of the global coordinate system 5 and 10 years after surgery with respect to the postoperative radiograph. Furthermore, the MTPM was stable in both follow-up periods. The results suggest that the Lubinus SP II hip stem is still stable 10 years after surgery, supporting that determining prognosis by short-term RSA follow-up of 2 years could be an appropriate tool for appraisal of implant behavior 10 years after surgery.
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9
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Weber E, Olsson C, Kesteris U, Flivik G. Is a hollow centralizer necessary when using a polished, tapered, cemented femoral stem? Acta Orthop 2017; 88:377-382. [PMID: 28418269 PMCID: PMC5499327 DOI: 10.1080/17453674.2017.1315553] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Background and purpose - A tapered, polished and collarless stem is normally equipped with a hollow centralizer to prevent the stem from becoming end-bearing in the cement as the stem subsides. In a randomized clinical trial, we evaluated such a stem (MS-30), which was initially introduced with a solid centralizer but was later recommended to be fitted with a hollow centralizer. We hypothesized that while the stem would sink more, it would become rotationally stable and have less retroversion with a hollow centralizer than with a solid centralizer. Patients and methods - We randomized 60 patients with primary hip arthritis to receive either a hollow centralizer or a solid centralizer with the stem. The effect was evaluated over a 10-year follow-up period with repeated RSA examinations, conventional radiographs, and clinical follow-ups using the WOMAC and SF-12 questionnaires. Results - At 10-year follow-up, the group with hollow centralizers had subsided more than the group with solid centralizers (1.99 mm (hollow) as opposed to 0.57 mm (solid); p < 0.001). However, rotation was similar at 10-year follow-up (mean retroversion 1.34° (hollow) and 1.30° (solid)). Both groups showed excellent 10-year results, with similar clinical outcome, and none of the stems were radiographically loose or had been revised. Interpretation - As expected, there was more subsidence in the group with hollow centralizers, and with similar magnitude to that reported in earlier RSA studies on conceptually similar prostheses. Interestingly, there was no difference in the rotational behavior of the prostheses. This stem type appears to have a design that, regardless of the type of centralizer and the possibility of subsidence, withstands the rotational forces it is subjected to very well. This study does not support the need for a hollow centralizer for these types of stems.
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Affiliation(s)
- Erik Weber
- Department of Orthopedics, Skåne University Hospital, Clinical Sciences, Lund University, Lund;,Correspondence:
| | - Christer Olsson
- Department of Orthopedics, Blekinge County Hospital, Karlshamn, Sweden
| | - Uldis Kesteris
- Department of Orthopedics, Skåne University Hospital, Clinical Sciences, Lund University, Lund
| | - Gunnar Flivik
- Department of Orthopedics, Skåne University Hospital, Clinical Sciences, Lund University, Lund
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10
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Ka-Bon K, Jason FCH, Bobby NKW. The Polished MS-30 Stem with a Solid Centralizer: A Minimum 10-year Review of Radiological and Clinical Outcomes. JOURNAL OF ORTHOPAEDICS, TRAUMA AND REHABILITATION 2015. [DOI: 10.1016/j.jotr.2014.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
Background/Purpose MS-30 is a triple tapered cemented femoral stem. Before 2005, it was used together with a solid centralizer. We wanted to investigate its effect on the migration behaviour and survivorship of polished stem with a minimum of 10 years. Methods Twenty-seven hips in 26 patients were available for follow-up. The mean length of follow-up was 12.1 years. Clinical outcomes were documented with the Harris Hip Score. Radiographs were examined for evidence of aseptic loosening. Results The average Harris Hip Score was 74.8. No stem was revised for aseptic loosening. Two stems (7.4%) developed radiolucent lines of more than 2 mm width with osteolysis. The mean subsidence was 0.77 mm. The survival rate at the 10th postoperative year, with aseptic loosening as the end point, was 100%. Conclusion The polished MS-30 stem with a solid centralizer has a satisfactory long-term outcome. Its mean subsidence was less than that of other polished tapered stems reported in the literature.
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Affiliation(s)
- Kwok Ka-Bon
- Department of Orthopaedics and Traumatology, Alice Ho Miu Ling Nethersole Hospital, Hong Kong
| | - Fan Chi-Ho Jason
- Department of Orthopaedics and Traumatology, Alice Ho Miu Ling Nethersole Hospital, Hong Kong
| | - Ng Kin-Wan Bobby
- Department of Orthopaedics and Traumatology, Alice Ho Miu Ling Nethersole Hospital, Hong Kong
- Department of Orthopaedics and Traumatology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong
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Flatøy B, Röhrl SM, Rydinge J, Dahl J, Diep LM, Nordsletten L. Triple taper stem design shows promising fixation and bone remodelling characteristics: radiostereometric analysis in a randomised controlled trial. Bone Joint J 2015; 97-B:755-61. [PMID: 26033054 DOI: 10.1302/0301-620x.97b6.34736] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cemented femoral stems with force closed fixation designs have shown good clinical results despite high early subsidence. A new triple-tapered stem in this category (C-stem AMT) was introduced in 2005. This study compares this new stem with an established stem of similar design (Exeter) in terms of migration (as measured using radiostereometric analysis), peri-prosthetic bone remodelling (measured using dual energy x-ray densitometry, DXA), Oxford Hip Score, and plain radiographs. A total of 70 patients (70 hips) with a mean age of 66 years (53 to 78) were followed for two years. Owing to missing data of miscellaneous reasons, the final analysis represents data from 51 (RSA) and 65 (DXA) patients. Both stems showed a typical pattern of migration: Subsidence and retroversion that primarily occurred during the first three months. C-stem AMT subsided less during the first three months (p = 0.01), before stabilising at a subsidence rate similar to the Exeter stem from years one to two. The rate of migration into retroversion was slightly higher for C-stem AMT during the second year (p = 0.03). Whilst there were slight differences in movement patterns between the stems, the C-stem AMT exhibits good early clinical outcomes and displays a pattern of migration and bone remodelling that predicts good clinical performance.
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Affiliation(s)
- B Flatøy
- Oslo University Hospital, P. O. Box 4950 Nydalen, N-0424 Oslo, Norway
| | - S M Röhrl
- Oslo University Hospital, P. O. Box 4950 Nydalen, N-0424 Oslo, Norway
| | - J Rydinge
- Oslo University Hospital, P. O. Box 4950 Nydalen, N-0424 Oslo, Norway
| | - J Dahl
- Oslo University Hospital, P. O. Box 4950 Nydalen, N-0424 Oslo, Norway
| | - L M Diep
- Oslo University Hospital, P. O. Box 4950 Nydalen, N-0424 Oslo, Norway
| | - L Nordsletten
- Oslo University Hospital, P. O. Box 4950 Nydalen, N-0424 Oslo, Norway
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