1
|
Taliercio MJ, Alnabulsi RK, Uppal PA, Shaw IM, Semenza KM, Pasha MA. Metal implant allergy: A retrospective cohort analysis at a university allergy practice. Allergy Asthma Proc 2024; 45:186-194. [PMID: 38755777 DOI: 10.2500/aap.2024.45.240005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Background: Concern of metal sensitization in pre- and postsurgical evaluation is growing, with the recent guidelines remaining the criterion standard for consideration of patch testing. Information remains scarce on surgical screening in the groups of patients who reported a history of metal sensitivity versus those with no reported history. Objective: The objective of this study was to assess the utility of patch testing in surgical candidates based on reported metal allergy history. The secondary objective was to evaluate the utility and outcomes in postsurgical patch testing. Methods: Nine hundred and thirty-one patient charts of patients with the diagnosis of "contact dermatitis" who underwent an evaluation at a single allergy clinic site between January 2013 and December 2022 were identified and reviewed as part of a retrospective chart review study. Patients were included in subgroups based on the time of patch testing and history of reported metal allergy. Results: In all, 67 patients underwent patch testing, 10 (14.9%) of whom were surgical candidates without a history of metal sensitivity, 31 (46.2%) of whom were surgical candidates with a history of metal sensitivity, and 26 (38.8%) of whom were postsurgical patients. Twenty-nine (43.3%) of patients had positive patch testing results, with only one (10%) in the presurgical group, 17 (54.8%) in the presurgical with a history of metal sensitivity, and 11 (42.3%) in the postsurgical group. Zero patients in our cohort without metal sensitivity who were undergoing the Nuss procedure had positive reactions on patch testing, whereas two of four (50%) with reported metal sensitivity who were undergoing the Nuss procedure had positive relevant metal reactions. Conclusion: Ambiguity in the utility of patch testing for surgical decision making remains, despite common utilization. Recent guidelines along with coordination of care among the surgeon, allergist, and patient remains the criterion standard of care.
Collapse
Affiliation(s)
- Mark J Taliercio
- From the Department of Internal Medicine, Albany Medical Center, Albany, New York
| | - Rawaa K Alnabulsi
- Division of Allergy and Immunology, Department of Internal Medicine, Albany Medical Center, Albany, New York
| | | | - Ian M Shaw
- Department of Pediatrics, Albany Medical Collage, Albany, New York, and
| | - Kristy M Semenza
- Department of Allergy and Immunology, Bassett Medical Center, Cooperstown, New York
| | - Muhammad A Pasha
- Division of Allergy and Immunology, Department of Internal Medicine, Albany Medical Center, Albany, New York
| |
Collapse
|
2
|
D’Amario F, De Berardinis L, Zanon G, Qordja F, Vitale U, Gigante AP. First Italian Experience with the Oxinium Metal-Backed Fixed-Bearing Medial Journey II Unicompartmental Knee System: Promising Short-Term Outcomes of 145 Cases. J Clin Med 2024; 13:1303. [PMID: 38592148 PMCID: PMC10932057 DOI: 10.3390/jcm13051303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 02/21/2024] [Accepted: 02/23/2024] [Indexed: 04/10/2024] Open
Abstract
(1) Background: Unicompartmental knee arthroplasty (UKA) provides a viable alternative to total knee arthroplasty (TKA) in patients with isolated medial osteoarthritis (OA). From 2007 to 2021, 23% of all primary knee arthroplasties in Italy were UKAs. We retrospectively evaluated clinical outcomes and satisfaction in patients implanted with a new oxinium metal-backed fixed-bearing medial unicompartmental prosthesis at a 24-month follow-up. (2) Methods: From December 2020 to December 2021, 145 patients were treated by a single surgeon at a single institution using the hypoallergenic Journey II prosthesis. Clinical outcome measures included the Knee Society Knee Score (KSKS), Knee Society Function Score (KSFS), Oxford Knee Society (OKS) score, University of California Los Angeles Activity Score (UCLA), the Physical Component Summary (PCS), and the Mental Component Summary (MCS), and were calculated preoperatively and at 12 and 24 months. The Forgotten Joint Score-12 (FJS-12) was calculated at 12 and 24 months. Patient satisfaction was collected at 24 months. The scores were compared using the Friedman test. (3) Results: All clinical scores improved significantly from baseline to 24 months (p < 0.0001), except for the FJS-12, which from 12 to 24 months did not improve significantly (p = 0.041). Patient satisfaction was 9.32 ± 0.74 out of 10. No patient experienced complications or required revision surgery. (4) Conclusions: The Journey II unicompartmental prosthesis is a valuable treatment option for end-stage medial OA, improving knee function, providing pain relief, and ensuring high patient satisfaction at 24 months.
Collapse
Affiliation(s)
- Federico D’Amario
- Orthopedic Unit, Humanitas San Pio X, Via Francesco Nava, 31, 20159 Milano, Italy; (F.D.); (G.Z.)
| | - Luca De Berardinis
- Clinical Orthopedics, Department of Clinical and Molecular Sciences, School of Medicine, Università Politecnica delle Marche, Via Tronto, 10/a, 60126 Ancona, Italy; (F.Q.); (A.P.G.)
| | - Giacomo Zanon
- Orthopedic Unit, Humanitas San Pio X, Via Francesco Nava, 31, 20159 Milano, Italy; (F.D.); (G.Z.)
| | - Fjorela Qordja
- Clinical Orthopedics, Department of Clinical and Molecular Sciences, School of Medicine, Università Politecnica delle Marche, Via Tronto, 10/a, 60126 Ancona, Italy; (F.Q.); (A.P.G.)
| | - Umberto Vitale
- IRCCS Humanitas Research Hospital, Via Manzoni, 56, Rozzano, 20089 Milano, Italy;
| | - Antonio Pompilio Gigante
- Clinical Orthopedics, Department of Clinical and Molecular Sciences, School of Medicine, Università Politecnica delle Marche, Via Tronto, 10/a, 60126 Ancona, Italy; (F.Q.); (A.P.G.)
| |
Collapse
|
3
|
Lagura JA, Dordunoo D, Mallidou A, Carey J, Borycki EM, Kushniruk A. Patient Journey Map: Metal Hypersensitivity. J Patient Exp 2023; 10:23743735231183576. [PMID: 37362250 PMCID: PMC10286172 DOI: 10.1177/23743735231183576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023] Open
Abstract
In this study, we highlight patients' experiences with metal hypersensitivity (MH) after receiving implantable medical devices (IMDs). We aim to identify gaps in clinical care and improve outcomes for individuals who have or may be sensitive to metals. Secondary data analysis from a previous interpretative phenomenological qualitative study was utilized. Using patient journey maps, we explored the experiences of 8 individuals from outpatient settings who received IMD and have first-hand experience with MH. We documented their journey from MH symptom recognition to diagnosis and subsequent IMD management. The results reveal that the time frames from device implantation to the treatment of MH varied from 17 to 228 months. The longest phase on the patient journey maps was the symptom recognition phase, which refers to the time between symptom emergence and MH diagnosis. Participants also required extensive healthcare utilization following their initial surgery. These findings emphasize that MH should be considered in differential diagnoses for patients with IMD. Early screening and detection of MH can enhance patient safety, alleviate distress, and reduce unnecessary healthcare utilization.
Collapse
Affiliation(s)
| | - Dzifa Dordunoo
- School of Nursing, University of Victoria, Victoria, Canada
| | | | - Jett Carey
- School of Nursing, University of Victoria, Victoria, Canada
| | - Elizabeth M. Borycki
- School of Health Information Science, University of Victoria, Victoria, BC, Canada
| | | |
Collapse
|
4
|
Costa MD, Donner S, Bertrand J, Pop OL, Lohmann CH. Hypersensitivity and lymphocyte activation after total hip arthroplasty. ORTHOPADIE (HEIDELBERG, GERMANY) 2023; 52:214-221. [PMID: 36820851 DOI: 10.1007/s00132-023-04349-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 01/16/2023] [Indexed: 02/24/2023]
Abstract
In the last decades total hip arthroplasty (THA) has become a standard procedure with many benefits but also a few still unsolved complications, which can lead to surgical revision in 19-23% of cases. Thus, aseptic loosening and metal hypersensitivity remain challenges. The phenomenon of wear debris causes chronic inflammation, which produces osteolysis and aseptic loosening. Wear debris promotes osteoclast production and inhibits osteoblasts by secretion of pro-inflammatory cytokines. Micro-abrasions can be induced by abrasive, adhesive and fatigue wear and cause a liberation of metal ions, which lead to another immune response elicited mostly by macrophages. Another reaction in the neocapsule can be a type IV hypersensitivity reaction to various alloys, containing metals such as nickel, cobalt and chromium. Patch testing and the lymphocyte transformation test (LTT) are not the best diagnostic possibilities to exclude a postoperative hypersensitivity reaction, because of the different alignment of the epicutaneous cells compared to the periprosthetic deep tissue. This hypersensitivity reaction is mostly induced by cytokines, which are secreted by macrophages rather than lymphocytes. In cell cultures and in animal studies, multipotent mesenchymal stem cells (MSC) have been shown to play a role in improving initial implant integration, to limit periprosthetic osteolysis and also to reconstitute peri-implant bone stock during implant revision. Thus, MSC might be used in the future to prolong the durability of THA. A better understanding of the interactions between primary chronic inflammation, corrosion, osteolysis and hypersensitivity is mandatory to develop new therapeutic strategies, aiming at the reduction of the incidence of implant failures. In this article the underlying immunological mechanisms to aseptic loosening are presented.
Collapse
Affiliation(s)
- Maximilian D Costa
- Department of Orthopaedic Surgery, Otto-von-Guericke University, Leipziger Str. 44, 39120, Magdeburg, Germany
- Department of Morphological Sciences, Faculty of Medicine and Pharmacy, University of Oradea, Oradea, Romania
| | - Stefanie Donner
- Centre for Musculoskeletal Surgery, Charité-University Medicine, Berlin, Germany
| | - Jessica Bertrand
- Department of Orthopaedic Surgery, Otto-von-Guericke University, Leipziger Str. 44, 39120, Magdeburg, Germany
| | - Ovidiu-Laurean Pop
- Department of Morphological Sciences, Faculty of Medicine and Pharmacy, University of Oradea, Oradea, Romania
| | - Christoph H Lohmann
- Department of Orthopaedic Surgery, Otto-von-Guericke University, Leipziger Str. 44, 39120, Magdeburg, Germany.
| |
Collapse
|
5
|
Bendich I, Tarity TD, Alpaugh K, Lyman S, Diane A, Sculco PK, McLawhorn AS. Identifying Aseptic Revision Total Knee Arthroplasty Diagnoses That Achieve Minimal Clinically Important Difference and Patient Acceptable Symptom State. J Arthroplasty 2023:S0883-5403(23)00020-7. [PMID: 36702437 DOI: 10.1016/j.arth.2023.01.020] [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] [Received: 09/19/2022] [Revised: 01/08/2023] [Accepted: 01/17/2023] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Minimal clinically important difference (MCID) defines a meaningful clinical change in patient-reported outcome measures. Patient acceptable symptom state (PASS) provides a patient-reported outcome measures threshold value to indicate a satisfactory clinical state. MCID and PASS for revision total knee arthroplasty (rTKA) are ill-defined. Moreover, it is unknown whether diagnosis influences the likelihood of achieving MCID or PASS. The purpose of this study was to calculate MCID for aseptic rTKA and compare the percentage of patients achieving MCID and PASS per diagnosis. METHODS An institutional registry of rTKA was used. First-time aseptic rTKA were included. Demographics, revision diagnosis, preoperative Knee Injury and Osteoarthritis Outcome Score, Jr (KOOS Jr), and 1-year postoperative KOOS Jr were recorded. The 1-year postoperative KOOS Jr PASS score was available. MCID was calculated using distribution-based methods. Three hundred fifty eight first-time aseptic rTKAs were analyzed. The 3 most common diagnoses were aseptic loosening (n = 156), instability (n = 109), and stiffness (n = 37). RESULTS The mean KOOS Jr 1-year postoperative MCID for rTKA was 10.3. Overall, 75.4% achieved MCID and 56.9% achieved PASS. The percentage of patients per diagnosis achieving MCID and PASS, respectively, were periprosthetic fracture (100, 44), aseptic loosening (94, 60), implant fracture (88, 63), stiffness (60, 38), instability (59, 61), polyethylene wear/osteolysis (57, 57), and metal allergy (44, 33). CONCLUSION Aseptic rTKA MCID is 10.3 for KOOS Jr at 1 year postoperatively. rTKA outcomes vary depending on preoperative diagnosis. Even in diagnoses with a high proportion of MCID achieved, less than 2/3 of patients achieved PASS, suggesting rTKA provides noticeable improvement but may not return patients to a satisfactory state.
Collapse
Affiliation(s)
- Ilya Bendich
- Hospital for Special Surgery, Adult Reconstruction and Joint Replacement, New York, New York
| | - Thomas D Tarity
- Hospital for Special Surgery, Adult Reconstruction and Joint Replacement, New York, New York
| | - Kyle Alpaugh
- Hospital for Special Surgery, Adult Reconstruction and Joint Replacement, New York, New York
| | - Stephen Lyman
- Hospital for Special Surgery, Adult Reconstruction and Joint Replacement, New York, New York
| | - Alioune Diane
- Hospital for Special Surgery, Adult Reconstruction and Joint Replacement, New York, New York
| | - Peter K Sculco
- Hospital for Special Surgery, Adult Reconstruction and Joint Replacement, New York, New York
| | - Alexander S McLawhorn
- Hospital for Special Surgery, Adult Reconstruction and Joint Replacement, New York, New York
| |
Collapse
|
6
|
Malahias MA, Bauer TW, Manolopoulos PP, Sculco PK, Westrich GH. Allergy Testing Has No Correlation with Intraoperative Histopathology from Revision Total Knee Arthroplasty for Implant-Related Metal Allergy. J Knee Surg 2023; 36:6-17. [PMID: 33932947 DOI: 10.1055/s-0041-1729618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Lymphocyte transformation testing (LTT) is often used in the workup for possible metal allergy after total knee arthroplasty (TKA) but the correlation of this test with other diagnostic metal-allergy findings in patients undergoing revision TKA for suspected metal allergy has not been established. A single-center, single-surgeon cohort of 19 TKAs in which both components were revised for presumed implant-related metal allergy based on history, physical, and LTT testing, to nonnickel-containing implants were retrospectively identified. Histopathologic samples obtained intraoperatively were semiquantitatively analyzed using both the Hospital for Special Surgery (HSS) synovial pathology score and the Campbell aseptic lymphocyte-dominant vasculitis-associated lesion (ALVAL) score. As histopathology control group, we included in the study an additional cohort of 17 patients who received aseptic revision TKA and had no history of reported or tested metal sensitivity. All preoperative LTT results were highly reactive to nickel. However, this did not correlate with local periarticular tissue response in 18 of 19 cases which demonstrated a low HSS synovial score (mean: 3.8 ± 2.8, of a maximum score of 28) and the low Campbell ALVAL scores (mean: 2.5/10 ± 1.3, of a maximum score of 10). There were not any significant differences between the study group (suspected implant-related metal allergy) and the control group (nonsuspected implant-related metal allergy) in regard to (1) the Campbell score and (2) the HSS synovial inflammatory score. Knee Society Clinical Rating System (KSCRS) function score improved significantly after revision (mean postoperative increase: 34.0 ± 17. 2; p < 0.001), as well as mean visual analog scale (VAS) pain (mean postoperative decrease: 33.3 ± 26.4; p < 0.01) score. The short-term survival rate (at mean follow-up of 26.1 months) of this patient cohort was 100%. In this cohort of revised TKA patients with suspected nickel allergy based on clinical presentation and LTT positive results, intraoperative histopathology was essentially normal. However, all patients with suspected nickel allergy showed a significant clinical and functional improvement with excellent short-term survival rates. The clinical significance of a positive LTT needs further study.
Collapse
Affiliation(s)
- Michael-Alexander Malahias
- Stavros Niarchos Foundation Complex Joint Reconstruction Center, Hospital for Special Surgery, New York, New York
| | - Thomas W Bauer
- Department of Pathology and Laboratory Medicine, Hospital for Special Surgery, New York, New York
| | - Philip P Manolopoulos
- Stavros Niarchos Foundation Complex Joint Reconstruction Center, Hospital for Special Surgery, New York, New York
| | - Peter K Sculco
- Stavros Niarchos Foundation Complex Joint Reconstruction Center, Hospital for Special Surgery, New York, New York
| | - Geoffrey H Westrich
- Stavros Niarchos Foundation Complex Joint Reconstruction Center, Hospital for Special Surgery, New York, New York
| |
Collapse
|
7
|
Anastasio AT, Johnson LG, Willhite JP, Mousallem T, Hendershot EF, Parekh SG. Team Approach: Metal Hypersensitivity in Total Joint Arthroplasty. JBJS Rev 2023; 11:01874474-202301000-00002. [PMID: 36722837 DOI: 10.2106/jbjs.rvw.22.00157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
» As total joint arthroplasty volume continues to grow nationwide, more uncommon complications such as metal implant hypersensitivity are reported with greater frequency in the literature. » Metal hypersensitivity is a challenging diagnosis given the potentially vague symptomology. It should be considered a diagnosis of exclusion, necessitating careful consideration of other potential etiologies of a failing implant before arriving at the final diagnosis of metal hypersensitivity. » Patients can experience substantial morbidity from implant rejection and in severe, refractory cases may even require revision arthroplasty and conversion to a hypoallergenic implant. » Given the complex nature of the condition, successful treatment of metal hypersensitivity to orthopaedic implants is best achieved through the use of a multidisciplinary, team-based approach. Immunologists, radiologists, and infectious disease physicians as well as orthopaedic surgeons and mechanical engineers are all vital in appropriate diagnosis and treatment of the condition.
Collapse
Affiliation(s)
| | - Lindsey G Johnson
- Campbell University School of Osteopathic Medicine, Lillington, North Carolina
| | | | | | | | | |
Collapse
|
8
|
Metal Allergy: State-of-the-Art Mechanisms, Biomarkers, Hypersensitivity to Implants. J Clin Med 2022; 11:jcm11236971. [PMID: 36498546 PMCID: PMC9739320 DOI: 10.3390/jcm11236971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/22/2022] [Accepted: 11/24/2022] [Indexed: 11/29/2022] Open
Abstract
Metal allergy is mainly an environmental disorder which can cause allergic contact dermatitis. Environmental metal exposures include jewelry, everyday metal items, mobile phones, leather, metal-rich food and implants, including stents or anchors. While consumer exposure is liable for the majority of metal hypersensitivity cases, the significance of occupational exposure to metals remains relevant. Although the most common metal allergens are nickel, chromium, and cobalt; however, lately, gold, palladium, titanium, and some others have also attracted attention. This review highlights advances in metal allergy mechanisms, biomarkers for potential patients' stratification as well as biological treatments. The most recent evidence of human exposure to metal for risk assessment is discussed, as well as the relationship between the occurrence of metal hypersensitivity and implanted devices, including non-characteristic symptoms. The latest data on the diagnosis of metal hypersensitivity are also reported.
Collapse
|
9
|
D'Ambrosi R, Ursino N, Mariani I, Corona K, Anghilieri FM, Franchi E, Monti L. Similar clinical and radiographic outcomes after two different hypoallergenic medial unicompartmental knee in patients with metal allergy. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY 2022; 33:1315-1328. [PMID: 35643948 DOI: 10.1007/s00590-022-03295-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 05/09/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND The purpose in the present study was to compare clinical and radiological outcomes of patients who had undergone a mobile-bearing unicompartmental knee arthroplasty (UKA) with either titanium niobium nitride (TiNbN) alloy implants or with fixed-bearing oxidized zirconium alloy implants. METHODS The records of two consecutive cohorts for a total of 86 hypoallergenic implants were prospectively analyzed. The first cohort consisted of 49 consecutive implantations of the hypoallergenic UKA Journey Uni Oxinium (Ox Group), while the second consisted of 37 consecutive series of UKA Oxford (TiNbN Group). All patients were evaluated by two independent surgeons who were not involved in the index surgery. The clinical evaluation consisted of evaluating each patient's Oxford Knee Score and Knee Society Score day before surgery (T0), and with two consecutive follow-ups at T1 (minimum follow-up 9 months) and T2 (minimum follow-up 24 months). RESULTS The two groups were homogeneous in all preoperative values, except Body Mass Index (BMI) and duration of final follow-up [both statistically higher (p < 0.05) in the TiNbN group]. Both groups showed a clinically significant improvement for all scores at final follow-up (p < 0.05). The only differences between the two groups involved a higher pre-operative Oxford Score in TiNbN group (p = 0.031), and different tibial and femoral angles at the final follow-up. CONCLUSIONS Both TiNbN and Oxinium UKA procedures enabled patients from good to excellent clinical and radiographic outcomes after the final follow-up, regardless of the age, gender, BMI bearing type, and implant size. LEVEL OF EVIDENCE LEVEL II: Comparative study.
Collapse
Affiliation(s)
- Riccardo D'Ambrosi
- IRCCS Istituto Ortopedico Galeazzi, Via Galeazzi 4, 20161, Milan, Italy. .,Department of Biomedical Sciences for Health, University of Milan, Via Mangiagalli 31, 20133, Milan, Italy.
| | - Nicola Ursino
- IRCCS Istituto Ortopedico Galeazzi, Via Galeazzi 4, 20161, Milan, Italy
| | - Ilaria Mariani
- Institute for Maternal and Child Health - IRCCS "Burlo Garofolo", Trieste, Italy
| | - Katia Corona
- Dipartimento Di Medicina E Scienze Della Salute Vincenzo Tiberio, Università Degli Studi del Molise, Campobasso, Italy
| | | | | | | |
Collapse
|
10
|
Battaglia AG, Ali-Zade C, Monti L, Al Khawashki H, Winkler H, Del Sel H, Mavrogenis AF, Benzakour T, Drago L, Romanò CL. Metal Hypersensitivity or Missed Periprosthetic Joint Infection? A Critical Review. Orthopedics 2022; 45:e73-e78. [PMID: 34978510 DOI: 10.3928/01477447-20211227-04] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The World Association Against Infection in Orthopedics And Trauma (W.A.I.O.T.) Study Group on Bone And Joint Infection Definitions Metal hypersensitivity (MHS) has been investigated by several authors as a possible reason for painful total joint arthroplasty, with controversial results. Periprosthetic joint infection (PJI) is another possible source of unexplained pain and implant failure that may be difficult to diagnose if not properly investigated. We performed this critical review to assess whether the current literature on MHS includes an adequate diagnostic workup to discern metal allergy from PJI. The results of this review highlight the importance of assessing patients for PJI before making a diagnosis of MHS and emphasize that the methods currently used to exclude PJI are substantially inadequate. Therefore, well-designed clinical trials with adequate diagnostic protocols and definitions of PJI that can differentiate MHS from low-grade PJI are needed. [Orthopedics. 2022;45(2):e73-e78.].
Collapse
|
11
|
Matar HE, Porter PJ, Porter ML. Metal allergy in primary and revision total knee arthroplasty : a scoping review and evidence-based practical approach. Bone Jt Open 2021; 2:785-795. [PMID: 34587776 PMCID: PMC8558451 DOI: 10.1302/2633-1462.210.bjo-2021-0098.r1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Aims Metal allergy in knee arthroplasty patients is a controversial topic. We aimed to conduct a scoping review to clarify the management of metal allergy in primary and revision total knee arthroplasty (TKA). Methods Studies were identified by searching electronic databases: Cochrane Central Register of Controlled Trials, Ovid MEDLINE, and Embase, from their inception to November 2020, for studies evaluating TKA patients with metal hypersensitivity/allergy. All studies reporting on diagnosing or managing metal hypersensitivity in TKA were included. Data were extracted and summarized based on study design, study population, interventions and outcomes. A practical guide is then formulated based on the available evidence. Results We included 38 heterogeneous studies (two randomized controlled trials, six comparative studies, 19 case series, and 11 case reports). The evidence indicates that metal hypersensitivity is a rare complication with some histopathological features leading to pain and dissatisfaction with no reliable screening tests preoperatively. Hypoallergenic implants are viable alternatives for patients with self-reported/confirmed metal hypersensitivity if declared preoperatively; however, concerns remain over their long-term outcomes with ceramic implants outperforming titanium nitride-coated implants and informed consent is paramount. For patients presenting with painful TKA, metal hypersensitivity is a diagnosis of exclusion where patch skin testing, lymphocyte transformation test, and synovial biopsies are useful adjuncts before revision surgery is undertaken to hypoallergenic implants with shared decision-making and informed consent. Conclusion Using the limited available evidence in the literature, we provide a practical approach to metal hypersensitivity in TKA patients. Future national/registry-based studies are needed to identify the scale of metal hypersensitivity, agreed diagnostic criteria, and management strategies. Cite this article: Bone Jt Open 2021;2(10):785–795.
Collapse
Affiliation(s)
- Hosam E Matar
- Wrightington Hospital, Wigan, UK.,Nottingham Elective Orthopaedic Services, Nottingham University Hospital NHS Trust, Nottingham, UK
| | | | | |
Collapse
|
12
|
Pahlavan S, Hegde V, Bracey DN, Jennings JM, Dennis DA. Bone Cement Hypersensitivity in Patients With a Painful Total Knee Arthroplasty: A Case Series of Revision Using Custom Cementless Implants. Arthroplast Today 2021; 11:20-24. [PMID: 34409143 PMCID: PMC8361018 DOI: 10.1016/j.artd.2021.06.001] [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: 04/01/2021] [Revised: 06/03/2021] [Accepted: 06/05/2021] [Indexed: 11/05/2022] Open
Abstract
Little is known about patients with bone cement hypersenstivity after total knee arthroplasty (TKA). We present 7 patients implanted with 8 TKAs with clinical failure and a cement hypersensitivity diagnosis. All demonstrated hypersensitivity to bone cement via skin patch and/or lymphocyte transformation testing. All 7 patients also showed hypersensitivity to metal, most commonly nickel. Patients underwent custom cementless TKA revision. Prerevision and postrevision outcome measures, radiographs, intraoperative findings, and postrevision complications are reported. Functional scores improved after revision except Veterans RAND-12 mental component scores, which declined. Four patients continue to exhibit symptoms postoperatively, while one patient has had 3 additional surgical procedures. Patients presenting with bone cement hypersensitivity after TKA are particularly challenging. Evidence-based guidelines are lacking, and revision surgery may not relieve the presenting symptoms.
Collapse
Affiliation(s)
- Sheila Pahlavan
- Colorado Joint Replacement, Denver, CO, USA.,University of Colorado School of Medicine, Aurora, CO, USA
| | - Vishal Hegde
- Colorado Joint Replacement, Denver, CO, USA.,Department of Orthopaedic Surgery, The Johns Hopkins University, Baltimore, MD, USA
| | - Daniel N Bracey
- Colorado Joint Replacement, Denver, CO, USA.,Department of Orthopaedic Surgery, University of North Carolina, Chapel Hill, NC, USA
| | - Jason M Jennings
- Colorado Joint Replacement, Denver, CO, USA.,Department of Mechanical and Materials Engineering, University of Denver, Denver, CO, USA
| | - Douglas A Dennis
- Colorado Joint Replacement, Denver, CO, USA.,Department of Mechanical and Materials Engineering, University of Denver, Denver, CO, USA.,Department of Orthopaedics, University of Colorado School of Medicine, Denver, CO, USA.,Department of Biomedical Engineering, University of Tennessee, Knoxville, TN, USA
| |
Collapse
|
13
|
No Clinical or Radiographic Differences Between Cemented Cobalt-Chromium and Titanium-Niobium Nitride Mobile-Bearing Unicompartmental Knee Arthroplasty. Indian J Orthop 2021; 55:1195-1201. [PMID: 34824720 PMCID: PMC8586226 DOI: 10.1007/s43465-021-00486-3] [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] [Received: 06/01/2021] [Accepted: 08/10/2021] [Indexed: 02/04/2023]
Abstract
PURPOSE This study aimed to compare the clinical and radiographic outcomes of patients with positive patch tests undergoing a medial mobile-bearing titanium-niobium nitride (TiNbN) unicompartmental knee arthroplasty (UKA) to patients undergoing standard UKA (cobalt-chromium [CoCr] implants). METHODS Two successive groups of patients, amounting to a total of 246 individuals, who received Oxford (Zimmer-Biomet, Warsaw, Indiana, USA) UKA were included. The first group was composed of a series of 203 consecutive standard CoCr UKAs (Standard Group), while the second group comprised 43 consecutive hypoallergenic TiNbN UKAs (HA group). The patients of the second group had a positive epicutaneous patch test result for metals. Each patient was evaluated using the Oxford Knee Score (OKS) and Knee Society Score (KSS) a day prior to the surgery (T 0) and at two consecutive follow-ups, namely T 1 (minimum follow-up of 12 months) and T 2 (minimum follow-up of 34 months). Radiographic measurements were performed at the final follow-up (T 2). RESULTS No statistical differences were noted between the two groups regarding demographic data (p > 0.05). No clinical or radiographic differences were found between the HA and standard groups at any follow-up (p > 0.05). A statistically significant improvement was found at any follow-up for both OKS and KSS (p < 0.05). CONCLUSIONS No clinical or radiographic differences between the hypoallergenic and standard cobalt-chromium groups at any follow-up were found, with a clinically significant improvement being experienced by both groups during the entire follow-up. LEVEL OF EVIDENCE Level II-comparative prospective study. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s43465-021-00486-3.
Collapse
|
14
|
Blom LH, Elrefaii SA, Zachariae C, Thyssen JP, Poulsen LK, Johansen JD. Memory T helper cells identify patients with nickel, cobalt, and chromium metal allergy. Contact Dermatitis 2021; 85:7-16. [PMID: 33576045 DOI: 10.1111/cod.13809] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 02/07/2021] [Indexed: 12/26/2022]
Abstract
BACKGROUND Patch testing is the gold standard for identifying culprit allergens in allergic contact dermatitis; however, it is laborious and positive reactions are difficult to quantitate. Development of complementary in vitro tests is, therefore, of great importance. OBJECTIVES This study aimed to improve the in vitro lymphocyte proliferation test (LPT) to detect allergic responses to nickel (Ni), cobalt (Co), and chromium (Cr). METHODS Twenty-one metal allergic patients with a positive patch test to Ni (n=16), Co (n=8), and Cr (n=3) and 13 controls were included. All were tested by a flow cytometric LPT. RESULTS Metal-reactive cells were identified as T helper (Th) cells with high expression of the memory marker CD45RO. Skin-homing (cutaneous lymphocyte-associated antigen positive [CLA+]) Ni-reactive memory Th (Thmem hi ) cells identified individuals with a positive patch test for Ni with 100% sensitivity (95% confidence interval [CI] 81%-100%) and 92% specificity (95% CI 67%-100%). Moreover, Co-specific Thmem hi cells expressing CCR6 identified patients with a positive patch test for Co with 63% sensitivity (95% CI 31%-86%) and 100% specificity (95% CI 77%-100%). In Cr allergic individuals, Cr-reactive Thmem hi cells tended to increased CLA and CCR6 expression. CONCLUSION Metal-reactive Th cells with high expression of CD45RO and coexpression of CLA and CCR6 improved the LPT, making it an attractive supplement to the patch test.
Collapse
Affiliation(s)
- Lars H Blom
- Department of Dermatology and Allergy, Allergy Clinic, Copenhagen University Hospital Herlev and Gentofte, Herlev, Denmark
| | - Sali A Elrefaii
- Department of Dermatology and Allergy, Allergy Clinic, Copenhagen University Hospital Herlev and Gentofte, Herlev, Denmark
| | - Claus Zachariae
- Department of Dermatology and Allergy, Copenhagen University Hospital Herlev and Gentofte, Herlev, Denmark
| | - Jacob P Thyssen
- Department of Dermatology and Allergy, Copenhagen University Hospital Herlev and Gentofte, Herlev, Denmark
| | - Lars K Poulsen
- Department of Dermatology and Allergy, Allergy Clinic, Copenhagen University Hospital Herlev and Gentofte, Herlev, Denmark
| | - Jeanne D Johansen
- Department of Dermatology and Allergy, National Allergy Research Centre, Copenhagen University Hospital Herlev and Gentofte, Herlev, Denmark
| |
Collapse
|
15
|
Nosbaum A, Nicolas JF, Lustig S, Vocanson M. When Joints Fail: Identifying the Allergen Helps. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2021; 9:3118-3119. [PMID: 33746089 DOI: 10.1016/j.jaip.2021.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 03/09/2021] [Indexed: 11/25/2022]
Affiliation(s)
- Audrey Nosbaum
- Department of Allergology and Clinical Immunology, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre-Bénite, France; CIRI, Centre International de Recherche en Infectiologie (Team Immunology of skin Allergy and Vaccination), Lyon, France; Inserm U1111, Lyon, France; Université Claude Bernard Lyon 1, Lyon, France; CNRS, UMR5308, Lyon, France; ENS de Lyon, F-69007, Lyon, France
| | - Jean-François Nicolas
- Department of Allergology and Clinical Immunology, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre-Bénite, France; CIRI, Centre International de Recherche en Infectiologie (Team Immunology of skin Allergy and Vaccination), Lyon, France; Inserm U1111, Lyon, France; Université Claude Bernard Lyon 1, Lyon, France; CNRS, UMR5308, Lyon, France; ENS de Lyon, F-69007, Lyon, France.
| | - Sébastien Lustig
- Orthopaedic Surgery and Sports Medicine Department, FIFA Medical Center of Excellence, Croix-Rousse Hospital, Lyon University Hospital, Lyon, France; IFSTTAR, LBMC UMR_T9406, 69622, Lyon, France
| | - Marc Vocanson
- CIRI, Centre International de Recherche en Infectiologie (Team Immunology of skin Allergy and Vaccination), Lyon, France; Inserm U1111, Lyon, France; Université Claude Bernard Lyon 1, Lyon, France; CNRS, UMR5308, Lyon, France; ENS de Lyon, F-69007, Lyon, France
| |
Collapse
|
16
|
Mayer AS, Erb S, Kim RH, Dennis DA, Shirname-More L, Pratte KA, Barker EA, Maier LA, Pacheco KA. Sensitization to Implant Components Is Associated with Joint Replacement Failure: Identification and Revision to Nonallergenic Hardware Improves Outcomes. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2021; 9:3109-3117.e1. [PMID: 33744472 DOI: 10.1016/j.jaip.2020.12.068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 12/11/2020] [Accepted: 12/29/2020] [Indexed: 10/21/2022]
Abstract
BACKGROUND Over 90% of one million annual US joint replacements are highly successful. Nonetheless, 10% do poorly owing to infection or mechanical issues. Many implant components are sensitizers, and sensitization could also contribute to implant failure. OBJECTIVE To determine the prevalence of implant sensitization in joint failure patients, their clinical characteristics, and implant revision outcomes. We hypothesized that sensitized patients would improve when revised with nonallergenic materials. METHODS We prospectively enrolled 105 joint failure patients referred by orthopedic surgeons who had already excluded infection or mechanical causes. Patients provided informed consent, completed a history and physical examination, patch testing to metals and bone cement, and a nickel lymphocyte proliferation test. A study coordinator was able to contact 64% of patients (n = 67) 9 to 12 months later to evaluate outcomes. RESULTS A total of 59% were sensitized to an implant component: 32% to metal and 37% to bone cement. The nickel lymphocyte proliferation test was 60% sensitive and 96% specific in diagnosing nickel sensitization. Most sensitized subjects reported no or uncertain histories of reactions to a specific material. Implant sensitized patients were younger and reported previous eczema, joint itching, and implant loosening. By 9 to 12 months later, most patients with a revised implant (revised) described significant improvement (16 of 22 revised for sensitization [P = .0003] vs 9 of 13 revised without sensitization [P = .047]) compared with patients without implant revision). All revised patients with sensitization used components to which they were not sensitized. Pain (P = .001), swelling (P = .035), and instability (P = .006) were significantly reduced in the revised sensitized group. CONCLUSIONS Sensitization to implant components is an important cause of unexplained joint replacement failure. Joint revisions based on sensitization information resulted in significant improvements.
Collapse
Affiliation(s)
- Annyce S Mayer
- Division of Environmental and Occupational Health Sciences, Department of Medicine, National Jewish Health, Denver, Colo; Division of Environmental and Occupational Health, University of Colorado School of Medicine, School of Public Health, Aurora, Colo
| | - Samantha Erb
- Graduate Medical Education, Northside Hospital, St Petersburg, Fla
| | | | - Douglas A Dennis
- Department of Bioengineering, Daniel Felix Ritchie School of Engineering and Computer Science, University of Denver, Denver, Colo; Department of Orthopedics, CU Anschutz School of Medicine, Aurora, Colo
| | - Lata Shirname-More
- Division of Environmental and Occupational Health Sciences, Department of Medicine, National Jewish Health, Denver, Colo
| | | | - Elizabeth A Barker
- Division of Environmental and Occupational Health Sciences, Department of Medicine, National Jewish Health, Denver, Colo
| | - Lisa A Maier
- Division of Environmental and Occupational Health Sciences, Department of Medicine, National Jewish Health, Denver, Colo; Division of Environmental and Occupational Health, University of Colorado School of Medicine, School of Public Health, Aurora, Colo; Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, School of Medicine, University of Colorado Denver, Aurora, Colo
| | - Karin A Pacheco
- Division of Environmental and Occupational Health Sciences, Department of Medicine, National Jewish Health, Denver, Colo; Division of Environmental and Occupational Health, University of Colorado School of Medicine, School of Public Health, Aurora, Colo.
| |
Collapse
|
17
|
D'Ambrosi R, Nuara A, Mariani I, Di Feo F, Ursino N, Hirschmann M. Titanium Niobium Nitride Mobile-Bearing Unicompartmental Knee Arthroplasty Results in Good to Excellent Clinical and Radiographic Outcomes in Metal Allergy Patients With Medial Knee Osteoarthritis. J Arthroplasty 2021; 36:140-147.e2. [PMID: 32773267 DOI: 10.1016/j.arth.2020.07.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/05/2020] [Accepted: 07/11/2020] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND The main purpose of the present study was to analyze the clinical and radiological outcomes of patients with positive skin patch tests who underwent medial mobile-bearing titanium niobium nitride unicompartmental knee arthroplasty (UKA) during a mid-term follow-up. METHODS Thirty-seven patients with positive skin patch tests were included in this prospective study. The clinical evaluation consisted of Oxford Knee Score and Knee Society Score (KSS) reports. Each patient was clinically evaluated the day before surgery (T0) as well as at T1 (11.9 ± 1.3 months) and during the final follow-up T2 (67.2 ± 19.1 months). The positioning of the UKA was evaluated during the final follow-up using standardized radiographs (T2: 67.2 ± 19.1 months). RESULTS Oxford and KSS ranged from a respective mean preoperative value of 23.0 ± 2.7 and 51.5 ± 5.0 to 42.1 ± 1.7 and 87.6 ± 2.2, respectively, at T1 (P < .001) and to the final values of 45.0 ± 1.9 and 91.9 ± 3.4, respectively, at T2 (P < .001 both vs T1 and T2). At T2, the mean femoral angle was 7.0° ± 4.5°, mean tibial angle was 3.0° ± 2.1°, and mean tibial slope was 5.1° ± 3.2°. A significant difference was found between KSS and Oxford with ANOVA for repeated measures over time (P < .001). The Oxford and KSS scores showed significant improvements during each follow-up. No complications were found, and not a single patient required a revision surgery during the follow-up period. CONCLUSION The hypoallergenic titanium niobium nitride mobile-bearing UKA showed comparable results to standard CoCr UKA regardless of the gender, age, BMI, and implant size of metal allergy patients with medial knee osteoarthritis. Careful patient selection processes and accurate medical histories played key roles in the choice of hypersensitivity-friendly implants.
Collapse
Affiliation(s)
| | - Alessandro Nuara
- IRCCS Istituto Ortopedico Galeazzi, Milan, Italy; Università degli Studi di Milano, Milan, Italy
| | | | | | | | - Michael Hirschmann
- Department of Orthopaedic Surgery and Traumatology, Kantonsspital Baselland, Baselland, Switzerland
| |
Collapse
|
18
|
Atilla HA, Çevik HB, Akdoğan M, Aslan H. Self-reported metal hypersensitivity in patients undergoing unicondylar knee arthroplasty. J Clin Orthop Trauma 2020; 14:17-21. [PMID: 33680813 PMCID: PMC7919954 DOI: 10.1016/j.jcot.2020.10.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 09/20/2020] [Accepted: 10/01/2020] [Indexed: 01/16/2023] Open
Abstract
OBJECTIVES There is ongoing discussion about arthroplasty surgery of patients with metal hypersensitivity. The aim of this study was to compare the functional outcomes and eosinophil counts of unicondylar knee arthroplasty (UKA) patients with and without a history of metal hypersensitivity. METHODS A retrospective review was made of the medical records of 148 extremities of 140 consecutive patients who underwent primary UKA between January 2016 and December 2017. The patients who met the inclusion criteria were screened for history of metal hypersensitivity using a questionnaire. The functional outcomes of patients and eosinophil levels were evaluated immediately before and at 6 weeks after surgery. RESULTS The mean follow-up period was 37 months (range, 18-48 months). Of the total 128 patients, 13 (10.2%) reported a history of metal hypersensitivity before the operation. There was no statistically significant difference between patients with or without a history of metal hypersensitivity in respect of the functional outcomes or eosinophil counts (p > 0.05). CONCLUSIONS The results of this study showed that the functional outcomes of patients who underwent UKA using a standard alloy did not change between the groups who reported having or not having a history of metal hypersensitivity. Although the study also showed that the eosinophil counts decreased after surgery compared to the preoperative counts, there was no statistical relationship between the eosinophil count and functional outcomes or metal hypersensitivity history.
Collapse
|
19
|
Guder C, Gravius S, Burger C, Wirtz DC, Schildberg FA. Osteoimmunology: A Current Update of the Interplay Between Bone and the Immune System. Front Immunol 2020; 11:58. [PMID: 32082321 PMCID: PMC7004969 DOI: 10.3389/fimmu.2020.00058] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Accepted: 01/09/2020] [Indexed: 12/11/2022] Open
Abstract
Immunology, already a discipline in its own right, has become a major part of many different medical fields. However, its relationship to orthopedics and trauma surgery has unfortunately, and perhaps unjustly, been developing rather slowly. Discoveries in recent years have emphasized the immense breadth of communication and connection between both systems and, importantly, the highly promising therapeutic opportunities. Recent discoveries of factors originally assigned to the immune system have now also been shown to have a significant impact on bone health and disease, which has greatly changed how we approach treatment of bone pathologies. In case of bone fracture, immune cells, especially macrophages, are present throughout the whole healing process, assure defense against pathogens and discharge a complex variety of effectors to regulate bone modeling. In rheumatoid arthritis and osteoporosis, the immune system contributes to the formation of the pathological and chronic conditions. Fascinatingly, prosthesis failure is not at all solely a mechanical problem of improper strain but works in conjunction with an active contribution of the immune system as a reaction to irritant debris from material wear. Unraveling conjoined mechanisms of the immune and osseous systems heralds therapeutic possibilities for ailments of both. Contemplation of the bone as merely an unchanging support pillar is outdated and obsolete. Instead it is mandatory that this highly diverse network be incorporated in our understanding of the immune system and hematopoiesis.
Collapse
Affiliation(s)
- Christian Guder
- Clinic for Orthopedics and Trauma Surgery, University Hospital Bonn, Bonn, Germany
| | - Sascha Gravius
- Clinic for Orthopedics and Trauma Surgery, University Hospital Bonn, Bonn, Germany.,Department of Orthopedics and Trauma Surgery, University Medical Center Mannheim of University Heidelberg, Mannheim, Germany
| | - Christof Burger
- Clinic for Orthopedics and Trauma Surgery, University Hospital Bonn, Bonn, Germany
| | - Dieter C Wirtz
- Clinic for Orthopedics and Trauma Surgery, University Hospital Bonn, Bonn, Germany
| | - Frank A Schildberg
- Clinic for Orthopedics and Trauma Surgery, University Hospital Bonn, Bonn, Germany
| |
Collapse
|