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A Systematic Review and Meta-Analysis of Non-database Comparative Studies on Cemented Versus Uncemented Femoral Stems in Primary Elective Total Hip Arthroplasty. J Arthroplasty 2022; 37:1888-1894. [PMID: 35398225 DOI: 10.1016/j.arth.2022.03.086] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 03/24/2022] [Accepted: 03/31/2022] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Cemented and uncemented femoral stems have shown excellent survivorship and outcomes in primary total hip arthroplasty (THA). Cementless stems have become increasingly common in the United States; however, multiple large database studies have suggested that elderly patients may have fewer complications with a cemented stem. As conclusions from large databases may be limited due to variations in data collection, this study investigated femoral stem survivorship and complication rates based on cement status in non-database studies. METHODS Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines were utilized to identify articles for inclusion up until June 2021. Included articles directly compared outcomes and complications between patients undergoing primary THA without femoral stem cementing to those with cementing. Studies were excluded if they utilized large databases or consisted of patients with a preoperative diagnosis of trauma. RESULTS Of the 1700 studies, 309 were selected for abstract review and nineteen for full-text review. A total of seven studies were selected. Meta-analyses indicated substantial heterogeneity between studies. There were no differences in revision rates (cementless: 5.53% vs. cemented 8.91%, P = .543), infection rates (cementless: 0.60% vs. cemented: 0.90%, P = .692), or periprosthetic fracture rates (cementless: 0.52% vs. cemented: 0.51%, P = .973) between groups. CONCLUSION There is scarce literature comparing outcomes and complications between cemented and cementless femoral stems in primary elective THA without utilizing a database methodology. In our study, there were no differences in complications detected on meta-analyses. Given previous findings in database studies, additional high-quality cohort studies are required to determine if selected patients may benefit from a cemented femoral stem.
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Kim YH, Jang YS. Clinical Performance of an Ultrashort, Proximally Porous-Coated and Tapered Metaphyseal-Fitting Cementless Femoral Stem Among Octogenarians. Orthopedics 2022; 45:181-186. [PMID: 35112963 DOI: 10.3928/01477447-20220128-09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Total hip arthroplasty (THA) among octogenarians presents greater challenges than among the younger patient population because of the high risk of perioperative morbidity and mortality and poor bone quality. We determined the clinical performance and radiographic results of an ultrashort, proximally porous-coated and tapered metaphyseal-fitting cementless femoral stem for octogenarians. A total of 100 unselected octogenarians (112 hips) were included in this retrospective study. All patients received the ultrashort, proximally porous-coated and tapered cementless stem during the study period, but patients who could not walk preoperatively were excluded from the analysis. Their mean age was 82.3±12.1 years (range, 80-92 years). Assessment was performed with the Harris Hip Score; Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score; thigh pain; University of California, Los Angeles (UCLA) activity score; and radiographic results. The mean duration of follow-up was 7.6 years (range, 6-9 years). At the final follow-up, the mean Harris Hip Score was 87±13 points, the mean WOMAC score was 26±8 points, and the mean UCLA activity score was 4.5 points. Osseointegration was obtained for 105 (94%) acetabular components and 110 (98%) femoral components. Kaplan-Meier survivorship analysis at 9 years showed that the survival rate for the acetabular component was 94% (95% CI, 91-98) and that of the femoral component was 98% (95% CI, 91-100), with aseptic loosening or revision as the end point. The ultrashort cementless femoral component provides stable fixation without the need for diaphyseal fixation among octogenarians. [Orthopedics. 2022;45(3):181-186.].
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Ikemura S, Motomura G, Hamai S, Fujii M, Kawahara S, Sato T, Hara D, Shiomoto K, Nakashima Y. Tapered wedge stems decrease early postoperative subsidence following cementless total hip arthroplasty in Dorr type C femurs compared to fit-and-fill stems. J Orthop Surg Res 2022; 17:223. [PMID: 35399097 PMCID: PMC8996569 DOI: 10.1186/s13018-022-03111-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 03/30/2022] [Indexed: 11/23/2022] Open
Abstract
Background To compare the degree of stem subsidence between two different femoral component designs and to determine the risk factors associated with stem subsidence after cementless total hip arthroplasty (THA) in Dorr type C femurs. Methods We retrospectively reviewed 104 consecutive hips in 100 patients with Dorr type C proximal femoral morphology who underwent primary cementless THA using a fit-and-fill stem or a tapered wedge femoral stem at our institution between January 2012 and June 2021. A fit-and-fill stem was used in 55 hips and a tapered wedge stem was used in 49 hips. Radiologically, the distance between the apex of the major trochanter and the stem shoulder were measured at three different time points (immediately [0W], one week [1W], and six weeks [6W] after surgery) and the degrees of stem subsidence were assessed by comparing the distance between 0 and 1W, 1W and 6W, and 0W and 6W, respectively. Results The mean degree of stem subsidence (0W vs. 1W) was 0.24 mm (standard deviation [SD] 0.36) in the fit-and-fill stem group, and 0.23 mm (SD 0.41) in the tapered wedge stem group. There was no significant difference between the two groups (P = 0.4862). However, the mean degrees of subsidence were significantly higher in the fit-and-fill stem group (1W vs. 6W, 0.38 mm [SD 0.68]; 0W vs. 6W, 0.65 mm [SD 0.87]) than in the tapered wedge stem group (1W vs. 6W, 0.16 mm [SD 0.32]; 0W vs. 6W, 0.24 mm [SD 0.38]) (P < 0.05 for both). In addition, the rates of > 3 mm subsidence (in which instability can be observed) were 18.2% (10 of 55 hips) and 2.0% (1 of 49 hips), respectively. There was also a significant difference between the two stems (P = 0.0091). Multivariate analysis demonstrated that fit-and-fill stem was a risk factor for > 3 mm subsidence after THA in Dorr type C femurs (P = 0.0050). Conclusion Our findings suggest that the tapered wedge stem is more suitable for Dorr type C femurs than the fit-and-fill stem to avoid early postoperative subsidence in cementless THA.
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Use of a Plasma-Sprayed Titanium-Hydroxyapatite Femoral Stem in Hip Arthroplasty in Patients Older than 70 Years. Is Cementless Fixation a Reliable Option in the Elderly? J Clin Med 2021; 10:jcm10204735. [PMID: 34682858 PMCID: PMC8540300 DOI: 10.3390/jcm10204735] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/12/2021] [Accepted: 10/14/2021] [Indexed: 12/29/2022] Open
Abstract
Background: Although cementless implants are increasing in popularity, the use of cementless femoral stems for total hip arthroplasty (THA) and hip hemiarthroplasty (HH) in elderly patients remains controversial. The aim of this study was to report the outcomes of a cementless stem used in a large multicentric cohort of elderly patients receiving elective THA and HH for displaced femoral neck fracture. Methods: A total of 293 patients (301 hips) aged 70 years or older (mean age, 78 years; range, 70–93) who received the same cementless plasma-sprayed porous titanium–hydroxyapatite stem were retrospectively evaluated after primary THA and HH to investigate stem survival, complications, and clinical and radiographic results. Results: Cumulative stem survival was 98.5% (95% CI, 96.4–99.4%; 91 hips at risks) with revision due to any reason as the end-point at 10-year follow-up (mean 8.6 years, range 4–12). No stem was revised due to aseptic loosening. The mean Forgotten Joint Score was 98.7. Radiographically, the implants showed complete osseointegration, with slight stress-shieling signs in less than 10% of the hips. Conclusion: The use of cementless stems was proven to be a reliable and versatile option even in elderly patients for elective THA and HH for femoral neck fracture.
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Mencia MM, Bidaisee S, Young Pong C, Hoford R. Successful Treatment of an Osteoporotic Posterior Fracture-Dislocation of the Hip in a Low-Resource Setting Using the Combined Hip Procedure. Arthroplast Today 2021; 10:68-72. [PMID: 34527798 PMCID: PMC8430438 DOI: 10.1016/j.artd.2021.05.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 05/25/2021] [Accepted: 05/26/2021] [Indexed: 11/06/2022] Open
Abstract
The prevalence of osteoporotic acetabular fractures and fracture-dislocations of the hip is increasing worldwide. These injuries are difficult to treat, and outcomes using traditional methods of osteosynthesis have been generally disappointing. Currently, there is debate about the management strategies with no widely held consensus on which technique is best. Studies from tertiary centers in North America and Europe have reported excellent results using the “combined hip procedure” which merges osteosynthesis and acute hip arthroplasty to treat these challenging fractures. As our population ages, these injuries are likely to occur more commonly in the developing world. We describe a case of an 80-year-old man who sustained a posterior fracture-dislocation of his hip and underwent successful treatment using the combined hip procedure in a low-resource setting.
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Affiliation(s)
- Marlon M Mencia
- Department of Clinical Surgical Sciences, University of the West Indies, St. Augustine, Trinidad and Tobago.,Department of Surgery, Port of Spain General Hospital, Trinidad, Trinidad and Tobago
| | - Shanta Bidaisee
- Department of Surgery, Port of Spain General Hospital, Trinidad, Trinidad and Tobago
| | - Curtis Young Pong
- Department of Orthopaedics, Eric Williams Medical Sciences Complex, Trinidad, Trinidad and Tobago
| | - Richard Hoford
- Department of Surgery, Port of Spain General Hospital, Trinidad, Trinidad and Tobago
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Lewis PM, Khan FJ, Feathers JR, Lewis MH, Morris KH, Waddell JP. Uncemented total hip arthroplasty can be used safely in the elderly population. Bone Jt Open 2021; 2:293-300. [PMID: 33940937 PMCID: PMC8168545 DOI: 10.1302/2633-1462.25.bjo-2021-0006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Aims “Get It Right First Time” (GIRFT) and NHS England’s Best Practice Tariff (BPT) have published directives advising that patients over the ages of 65 (GIRFT) and 69 years (BPT) receiving total hip arthroplasty (THA) should receive cemented implants and have brought in financial penalties if this policy is not observed. Despite this, worldwide, uncemented component use has increased, a situation described as a ‘paradox’. GIRFT and BPT do, however, acknowledge more data are required to support this edict with current policies based on the National Joint Registry survivorship and implant costs. Methods This study compares THA outcomes for over 1,000 uncemented Corail/Pinnacle constructs used in all age groups/patient frailty, under one surgeon, with identical pre- and postoperative pathways over a nine-year period with mean follow-up of five years and two months (range: nine months to nine years and nine months). Implant information, survivorship, and regular postoperative Oxford Hip Scores (OHS) were collected and two comparisons undertaken: a comparison of those aged over 65 years with those 65 and under and a second comparison of those aged 70 years and over with those aged under 70. Results Overall revision rate was 1.3% (13/1,004). A greater number of revisions were undertaken in those aged over 65 years, but numbers were small and did not reach significance. The majority of revisions were implant-independent. Single component analysis revealed a 99.9% and 99.6% survival for the uncemented cup and femoral component, respectively. Mean patient-reported outcome measures (PROMs) improvement for all ages outperformed the national PROMs and a significantly greater proportion of those aged over 65/69 years reached and maintained a meaningful improvement in their OHS earlier than their younger counterparts (p < 0.05/0.01 respectively). Conclusion This study confirms that this uncemented THA system can be used safely and effectively in patient groups aged over 65 years and those over 69 years, with low complication and revision rates. Cite this article: Bone Jt Open 2021;2(5):293–300.
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Affiliation(s)
- Peter M Lewis
- Prince Charles and Royal Glamorgan Hospitals, Cwm Taf Morgannwg University Health Board, South Wales, UK
| | - Faiz J Khan
- Prince Charles and Royal Glamorgan Hospitals, Cwm Taf Morgannwg University Health Board, South Wales, UK
| | | | - Michael H Lewis
- Faculty of Life Sciences and Education, University of South Wales, Pontypridd, UK
| | - Keith H Morris
- Biomedical Sciences Department, Cardiff Metropolitan University, Cardiff, UK
| | - James P Waddell
- Division of Orthopaedics, St Michael's Hospital, Toronto, Canada
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Guo J, Tan J, Peng L, Song Q, Kong HR, Wang P, Shen HY. Comparison of Tri-Lock Bone Preservation Stem and the Conventional Standard Corail Stem in Primary Total Hip Arthroplasty. Orthop Surg 2021; 13:749-757. [PMID: 33675168 PMCID: PMC8126948 DOI: 10.1111/os.12946] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 11/16/2020] [Accepted: 01/16/2021] [Indexed: 02/05/2023] Open
Abstract
Objective To compare the clinical and radiographic outcomes between the Tri‐Lock Bone Preservation Stem (BPS) and the conventional standard Corail stem in primary total hip arthroplasty (THA). Methods From March 2012 to May 2014, we retrospectively reviewed 84 patients (104 hips) who received Tri‐Lock (BPS) and 84 patients (115 hips) who received conventional standard Corail stem in THA. Their mean ages were 53.12 ± 2.32 years and 52.00 ± 2.11 years, respectively. The clinical outcomes were assessed by Western Ontario and McMaster University Osteoarthritis Index (WOMAC), Pain Visual Analogue Scale (VAS) and Harris Hip Score (HHS). The radiological outcomes were evaluated by the radiological examination. Accordingly, Intraoperative and postoperative complications were observed as well. Results The mean follow‐up time was 48.23 ± 2.91 months in the Tri‐Lock (BPS) group and 49.11 ± 2.11 months in the Corail group, respectively. The bleeding volumes in two groups were comparable (169.22 ± 58.11 mL vs 179.30 ± 59.14 mL, P = 0.003), with more bleeding volume in Corail group patients, while no statistically significance with respect to operation time was observed (65.41 ± 6.24 min vs 63.99 ± 6.33 min, P = 0.567). The rates of intraoperative fracture was 8% for the Corail group while 1% for the Tri‐Lock (BPS) group (8% vs 1%, P = 0.030). At final follow‐up, no statistical differences in regard to HHS, WOMAC, and Pain VAS were revealed between the two groups (P > 0.05). The rate of thigh pain was higher in Corail group than in Tri‐lock (BPS) group (5% vs 0%, P = 0.043). However, incidence of stress shielding in grade 1 was higher in Tri‐Lock (BPS) than in the Corail group (76% vs 23%, P < 0.01), while those in grade 2 and 3 were lower compared to the Corail stem (15% vs 28%, P < 0.01; 9% vs 16%, P = 0.008, respectively). Intriguingly, other assessments in relation to radiographic outcomes and postoperative complications were not comparable between the two groups. The Kaplan–Meier survival rate (revision surgery performed for any reason was defined as the end point) was similar between the two groups (P = 0.57), with 98.8% (95% confidence interval, 92.3%–100%) in Tri‐lock (BPS) group and 97.6% (95% confidence interval, 94.6%–100%) in Corail group. Conclusions The Tri‐Lock (BPS) has similar clinic performances compared to the Corail stem. Furthermore, the Tri‐lock (BPS) stem has some advantages in achieving lower incidence of thigh pain, stress shielding and intra‐operative fracture. Therefore, we recommend the Tri‐lock (BPS) stem as a good alternative in primary total hip arthroplasty, especially taking into account patient factors, including bone deficiency and convenience of extraction of the stem in hip revision.
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Affiliation(s)
- Jiang Guo
- Department of Orthopaedics, The Eighth Affiliated Hospital, Sun Yat-Sen University, Shenzhen, China.,Department of Orthopaedics, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Jie Tan
- Department of Orthopaedic Surgery & Orthopeadic Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Lei Peng
- Department of Orthopaedics, The Eighth Affiliated Hospital, Sun Yat-Sen University, Shenzhen, China.,Department of Orthopaedics, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Qian Song
- Department of Osteology, Tianjin Hospital, Tianjin, China
| | - Hao-Ran Kong
- Department of Orthopaedics, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Peng Wang
- Department of Orthopaedics, The Eighth Affiliated Hospital, Sun Yat-Sen University, Shenzhen, China.,Department of Orthopaedics, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Hui-Yong Shen
- Department of Orthopaedics, The Eighth Affiliated Hospital, Sun Yat-Sen University, Shenzhen, China.,Department of Orthopaedics, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
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Midterm Survivorship of an Uncemented Hydroxyapatite-Coated Titanium Femoral Component and Clinically Meaningful Outcomes in Patients Older Than 75 Years. J Clin Med 2021; 10:jcm10051019. [PMID: 33801479 PMCID: PMC7958839 DOI: 10.3390/jcm10051019] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/17/2021] [Accepted: 02/24/2021] [Indexed: 11/17/2022] Open
Abstract
Purpose: It remains controversial whether cementless femoral components are safe in elderly patients. The aim of this study was (1) to determine the stem survival rate in patients >75 years of age who were treated with an uncemented femoral component and (2) to report clinically significant results on a mid-term follow-up. Methods: 107 total hip arthroplasties (THA) were retrospectively evaluated in 97 patients over 75 years of age (mean age 78 years, range 75–87) treated with an uncemented femoral stem. The minimum follow-up was five years (mean 6.4 years, range 5–8). Stem survival rates, clinically meaningful outcomes, and incidence of complications were evaluated. Results: Kaplan-Meier survival analysis, with the endpoint revision for any reason, showed a 6.4-year survival rate of 98% (95% CI, 95–99%; 63 hips at risk). The survival rates were comparable for male and female patients (log-rank test, p = 0.58). The modified Harris Hip Score (mHHS) improved from 42.2 (12 to 85) points to 81.1 (22 to 97) points (p < 0.0001). Mid-term minimal clinically important difference (MCID), substantial clinical benefit (SCB), and patient acceptable symptomatic state (PASS) were 25, 84, and 70, respectively. Conclusion: An uncemented stem is a viable option in patients over 75 years with good clinical outcomes and survivorship. Periprosthetic fractures were not a relevant failure mechanism with the stem used.
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Kheir MM, Drayer NJ, Chen AF. An Update on Cementless Femoral Fixation in Total Hip Arthroplasty. J Bone Joint Surg Am 2020; 102:1646-1661. [PMID: 32740265 DOI: 10.2106/jbjs.19.01397] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Michael M Kheir
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, Indiana
| | - Nicholas J Drayer
- Department of Orthopaedic Surgery, Madigan Army Medical Center, Tacoma, Washington
| | - Antonia F Chen
- Department of Orthopaedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
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Blankstein M, Lentine B, Nelms NJ. The Use of Cement in Hip Arthroplasty: A Contemporary Perspective. J Am Acad Orthop Surg 2020; 28:e586-e594. [PMID: 32692094 DOI: 10.5435/jaaos-d-19-00604] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Notable advances in hip arthroplasty implants and techniques over the past 60 years have yielded excellent survivorship of fully cemented, hybrid, and reverse hybrid total hip replacements as demonstrated in joint registries worldwide. Major advances in noncemented implants have reduced the use of cement, particularly in North America. Noncemented implants predominate today based on procedural efficiency, concern related to thromboembolic risk, and a historic belief that cement was the primary cause of osteolysis and implant loosening. With the decline of cemented techniques, press-fit fixation has become common even in osteoporotic elderly patients. Unfortunately, there is a troubling rise in intraoperative, as well as early and late postoperative periprosthetic fractures associated with the use of noncemented implants. Despite the success of noncemented fixation, an understanding of modern cement techniques and cemented implant designs is useful to mitigate the risk of periprosthetic fractures. Cemented acetabular components can be considered in elderly patients with osteoporotic or pathologic bone. Cemented stems should be considered with abnormal proximal femoral morphology, conversion of failed hip fixation, inflammatory arthritis, patient age over 75 (especially women), osteoporotic bone (Dorr C), and in the treatment of femoral neck fractures.
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Affiliation(s)
- Michael Blankstein
- From the The University of Vermont Medical Center, Orthopedics and Rehabilitation Center (Dr. Blankstein and Dr. Nelms), and the Department of Orthopaedics and Rehabilitation (Dr. Lentine), The Robert Larner, M.D., College of Medicine at The University of Vermont, Burlington, VT
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Rattanaprichavej P, Laoruengthana A, Chotanaphuti T, Khuangsirikul S, Phreethanutt C, Pongpirul K. Subsidence of Hydroxyapatite-Coated Femoral Stem in Dorr Type C Proximal Femoral Morphology. J Arthroplasty 2019; 34:2011-2015. [PMID: 31182412 DOI: 10.1016/j.arth.2019.05.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 05/07/2019] [Accepted: 05/08/2019] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Good bone quality and proper proximal femoral morphology are thought to be necessary for tapered design, cementless femoral stems to resist subsidence. Using tapered, cementless stem for patients with stovepipe morphology or Dorr type C is controversial. The purpose of this study is to analyze (1) subsidence of the fully hydroxyapatite (HA)-coated, tapered, cementless stem in different morphology according to Dorr classification, (2) subsidence of the stem related to radiographic canal-fill ratio. METHODS The digitized radiographs of 311 consecutive cementless primary total hip arthroplasty with fully HA-coated, tapered stem were retrospectively reviewed. Subsidence and the canal-fill ratio at 4 locations were evaluated postoperatively after a minimum of 2 years of follow-up. The threshold of subsidence >3 mm was considered as a clinically significant migration. RESULTS A multivariate regression analysis of subsidence across Dorr type, controlling for age, gender, and intraoperative calcar fracture, demonstrated 0.40 mm (P = .28) and 0.18 mm (P = .51) greater subsidence in Dorr type C and B when compared to Dorr type A. Age, gender, and calcar fracture had no influence on subsidence, whereas greater canal-fill ratio at 2 cm below lesser trochanter resulted in significantly less subsidence (P = .02). Additionally, all variables did not affect the risk of having subsidence >3 mm. CONCLUSION The proximal femoral morphology has no statistically significant effect on the subsidence of fully HA-coated stem. Therefore, this stem type might be a viable option for Dorr type C. Increasing the canal-fill ratio at metadiaphyseal junction may ensure the stability of the stem.
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Affiliation(s)
- Piti Rattanaprichavej
- Department of Orthopaedics, Faculty of Medicine, Naresuan University, Phitsanulok, Thailand
| | - Artit Laoruengthana
- Department of Orthopaedics, Faculty of Medicine, Naresuan University, Phitsanulok, Thailand
| | | | | | | | - Krit Pongpirul
- Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand; Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
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