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Rodriguez HC, Mekkawy KL, Watkins A, Roche MW, Burke WV, Gosthe RG. Risk of Periprosthetic Joint Infection After Intra-Articular Corticosteroid Injection Following Unicompartmental Knee Arthroplasty. J Arthroplasty 2022; 38:815-819. [PMID: 36509243 DOI: 10.1016/j.arth.2022.12.005] [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: 09/26/2022] [Revised: 11/28/2022] [Accepted: 12/02/2022] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Perioperative intra-articular joint injection is a known risk factor for developing prosthetic joint infection (PJI) in the immediate preoperative and postoperative periods for total knee arthroplasty, but is less defined in unicompartmental knee arthroplasty (UKA). The goal of this study was to elucidate the risk of developing PJI after intra-articular corticosteroid injection (IACI) into a post UKA knee. METHODS A retrospective review of a nationwide administrative claims database was performed from January 2015 to October 2020. Patients who underwent UKA and had an ipsilateral IACI were identified and matched 2:1 to a control group of primary UKA patients who did not receive IACI. Multivariate logistic analyses were conducted to assess differences in PJI rates at 6 months, 1 year, and 2 years. RESULTS A total of 47,903 cases were identified, of which 2,656 (5.5%) cases received IACI. The mean time from UKA to IACI was 355 days. The incidence of PJI in the IACI group was 2.7%, compared to 1.3% in the control group. The rate of PJI after IACI was significantly higher than the rate in the control group at 6 months, 1 year, and 2 years (all P < .05). The majority of PJI occurred within the first 6 months following IACI (75%). CONCLUSION In this study, IACI in a UKA doubled the risk of PJI compared to patients who did not receive an injection. Surgeons should be aware of this increased risk to aid in their decision-making about injecting into a UKA. LEVEL OF EVIDENCE III, retrospective comparative study.
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Affiliation(s)
- Hugo C Rodriguez
- Holy Cross Orthopedic Institute, Fort Lauderdale, Florida; Larkin Community Hospital, Department of Orthopaedic Surgery, South Miami, Florida
| | | | - Adam Watkins
- Geisinger Commonwealth School of Medicine, Scranton, Pennsylvania
| | - Martin W Roche
- Holy Cross Orthopedic Institute, Fort Lauderdale, Florida; Hospital for Special Surgery Florida, West Palm Beach, Florida
| | | | - Raul G Gosthe
- Holy Cross Orthopedic Institute, Fort Lauderdale, Florida
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Kazarian GS, Haddad FS, Donaldson MJ, Wignadasan W, Nunley RM, Barrack RL. Implant Malalignment may be a Risk Factor for Poor Patient-Reported Outcomes Measures (PROMs) Following Total Knee Arthroplasty (TKA). J Arthroplasty 2022; 37:S129-S133. [PMID: 35248754 DOI: 10.1016/j.arth.2022.02.087] [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: 01/17/2022] [Revised: 02/14/2022] [Accepted: 02/21/2022] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Implant malalignment may be a risk factor for poor patient-reported outcomes measures (PROMs) following total knee arthroplasty (TKA). METHODS Postoperative surveys were administered to assess PROMs regarding satisfaction, pain, and function in 262 patients who underwent surgery at 4 centers in the U.S. and U.K (average age, 67.2) at a mean 5.5 years after primary TKA. Postoperative distal femoral angle (DFA), proximal tibial angle (PTA), and posterior tibial slope angle (PSA) were radiographically measured, and outliers were recorded. PROMs were compared between patients with aligned versus malaligned knees using univariate analysis. RESULTS Patients with DFA, PTA, and PSA outliers were more likely to experience similar or decreased activity levels postoperatively than patients with no alignment outliers, as were patients with 1 or 2 outliers of any kind (P < .05). Patients with DFA, PTA, and PSA outliers were significantly more likely to be dissatisfied with their ability to perform activities of daily living (ADLs), as were patients with 1 or 2 outliers of any kind (P < .05). Patients with DFA and PSA outliers were more likely to be dissatisfied with their degree of pain relief, as were patients with 2 outliers of any kind (P < .05). Finally, patients with DFA and PSA outliers, as well as those with 1 outlier of any kind, were more likely to be dissatisfied with their overall knee function (P < .05). CONCLUSION DFA, PTA, and PSA outliers represent a significant risk factor for decreased satisfaction with activities of daily living(ADLs), pain relief, and knee function, as well as decreased activity levels. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Gregory S Kazarian
- Department of Orthopaedic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St. Louis, MO; Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY
| | - Fares S Haddad
- Department of Orthopaedic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St. Louis, MO
| | - Matthew J Donaldson
- Department of Orthopaedic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St. Louis, MO
| | - Warran Wignadasan
- Department of Orthopaedic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St. Louis, MO
| | - Ryan M Nunley
- Department of Orthopaedic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St. Louis, MO
| | - Robert L Barrack
- Department of Orthopaedic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St. Louis, MO
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Anderson AM, Comer C, Smith TO, Drew BT, Pandit H, Antcliff D, Redmond AC, McHugh GA. Consensus on pre-operative total knee replacement education and prehabilitation recommendations: a UK-based modified Delphi study. BMC Musculoskelet Disord 2021; 22:352. [PMID: 33853564 PMCID: PMC8044503 DOI: 10.1186/s12891-021-04160-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 03/09/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Over 90,000 total knee replacement (TKR) procedures are performed annually in the United Kingdom (UK). Patients awaiting TKR face long delays whilst enduring severe pain and functional limitations. Almost 20% of patients who undergo TKR are not satisfied post-operatively. Optimising pre-operative TKR education and prehabilitation could help improve patient outcomes pre- and post-operatively; however, current pre-operative TKR care varies widely. Definitive evidence on the optimal content and delivery of pre-operative TKR care is lacking. This study aimed to develop evidence- and consensus-based recommendations on pre-operative TKR education and prehabilitation. METHODS A UK-based, three-round, online modified Delphi study was conducted with a 60-member expert panel. All panellists had experience of TKR services as patients (n = 30) or professionals (n = 30). Round 1 included initial recommendations developed from a mixed methods rapid review. Panellists rated the importance of each item on a five-point Likert scale. Panellists could also suggest additional items in Round 1. Rounds 2 and 3 included all items from Round 1, new items suggested in Round 1 and charts summarising panellists' importance ratings from the preceding round. Free-text responses were analysed using content analysis. Quantitative data were analysed descriptively. All items rated as 'Important' or 'Very important' by at least 70% of all respondents in Round 3 were included in the final set of recommendations. RESULTS Fifty-five panellists (92%) (patients n = 26; professionals n = 29) completed Round 3. Eighty-six recommendation items were included in Round 1. Fifteen new items were added in Round 2. Rounds 2 and 3 therefore included 101 items. Seventy-seven of these reached consensus in Round 3. Six items reached consensus amongst patient or professional panellists only in Round 3. The final set of recommendations comprises 34 education topics, 18 education delivery approaches, 10 exercise types, 13 exercise delivery approaches and two other treatments. CONCLUSIONS This modified Delphi study developed a comprehensive set of recommendations that represent a useful resource for guiding decision-making on the content and delivery of pre-operative TKR education and prehabilitation. The recommendations will need to be interpreted and reviewed periodically in light of emerging evidence.
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Affiliation(s)
- Anna M Anderson
- Leeds Institute of Rheumatic & Musculoskeletal Medicine, University of Leeds, Leeds, UK.
- NIHR Leeds Biomedical Research Centre, Leeds, UK.
| | - Christine Comer
- Leeds Institute of Rheumatic & Musculoskeletal Medicine, University of Leeds, Leeds, UK
- Leeds Community Healthcare NHS Trust Musculoskeletal and Rehabilitation Services, Leeds, UK
| | - Toby O Smith
- School of Health Sciences, University of East Anglia, Norwich, UK
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Benjamin T Drew
- Leeds Institute of Rheumatic & Musculoskeletal Medicine, University of Leeds, Leeds, UK
| | - Hemant Pandit
- Leeds Institute of Rheumatic & Musculoskeletal Medicine, University of Leeds, Leeds, UK
- NIHR Leeds Biomedical Research Centre, Leeds, UK
| | - Deborah Antcliff
- School of Healthcare, University of Leeds, Leeds, UK
- Physiotherapy Department, Bury Care Organisation, Northern Care Alliance NHS Group, Bury, England, UK
| | - Anthony C Redmond
- Leeds Institute of Rheumatic & Musculoskeletal Medicine, University of Leeds, Leeds, UK
- NIHR Leeds Biomedical Research Centre, Leeds, UK
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Li X, Guo D, Wang H, Zhou T. Effect and safety of intravenous versus oral acetaminophen after unicompartmental knee replacement: A protocol of randomized controlled study. Medicine (Baltimore) 2020; 99:e21816. [PMID: 32846821 PMCID: PMC7447383 DOI: 10.1097/md.0000000000021816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Due to the soft tissue injury and large amount of bone destruction involved, undesirable postoperative pain remains a challenge for both patients and surgeons after unicompartmental knee replacement (UKR). However, there are no studies comparing the effectiveness of oral and intravenous acetaminophen as part of a standard multimodal perioperative pain regimen after UKR. Thus, this prospective randomized study was conducted to compare pain control outcomes with postoperative oral versus intravenous acetaminophen use in adults undergoing UKR. METHODS The institutional review board of the Traditional Chinese Medicine- western Medicine Hospital of Cangzhou approved the study protocol. This blinded and randomized study was carried out in accordance with the principles of the Helsinki Declaration. We included patients who were scheduled for UKR with an American Society of Anesthesiologists status of I to III, who were mentally competent, and who were able to give consent for enrolment in the study. Patients were randomly assigned on a 1:1 basis to receive either intravenous acetaminophen or oral acetaminophen. We ensured that the patients, care providers, and outcome assessors were blinded to the group assignment during the study period. Primary outcomes were postoperative pain at rest and during motion (knee flexion of 45°) measured using a visual analog scale score. Secondary outcomes included morphine consumption at 24, 48, and 72 hours after surgery, length of hospital stay, range of motion, daily ambulation distance, and adverse events occurrence. All statistical analyses were performed using SPSS 25.0. Differences associated with a P value of <.05 were considered statistically significant. RESULTS It was hypothesized that patients receiving intravenous acetaminophen would exhibit similar postoperative outcomes compared with patients receiving oral acetaminophen. TRIAL REGISTRATION This study was registered in Research Registry (researchregistry5825).
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Chen Z, Deng Z, Li Q, Chen J, Ma Y, Zheng Q. How to predict early clinical outcomes and evaluate the quality of primary total knee arthroplasty: a new scoring system based on lower-extremity angles of alignment. BMC Musculoskelet Disord 2020; 21:518. [PMID: 32746812 PMCID: PMC7397679 DOI: 10.1186/s12891-020-03528-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 07/20/2020] [Indexed: 12/29/2022] Open
Abstract
Background A method that can accurately predict the outcome of surgery can give patients timely feedback. In addition, to some extent, an objective evaluation method can help the surgeon quickly summarize the patient’s surgical experience and lessen dependence on the long wait for follow-up results. However, there was still no precise tool to predict clinical outcomes of total knee arthroplasty (TKA). This study aimed to develop a scoring system to predict clinical results of TKA and then grade the quality of TKA. Methods We retrospectively reviewed 98 primary TKAs performed between April 2013 and March 2017 to determine predictors of clinical outcomes among lower-extremity angles of alignment. Applying multivariable linear-regression analysis, we built Models (i) and (ii) to predict detailed clinical outcomes which were evaluated using the Knee Society Score (KSS). Multivariable logistic-regression analysis was used to establish Model (iii) to predict probability of getting a good clinical outcome (PGGCO) which was evaluated by Knee Injury and Osteoarthritis Outcome Score (KOOS) score. Finally, we designed a new scoring system consisting of 3 prediction models and presented a method of grading TKA quality. Thirty primary TKAs between April and December 2017 were enrolled for external validation. Results We set up a scoring system consisting of 3 models. The interpretations of Model (i) and (ii) were good (R2 = 0.756 and 0.764, respectively). Model (iii) displayed good discrimination, with an area under the curve (AUC) of 0.936, and good calibration according to the calibration curve. Quality of surgery was stratified as follows: “A” = PGGCO ≥0.8, “B” = PGGCO ≤0.6 but < 0.8, and “C” = PGGCO < 0.6. The scoring system performed well in external validation. Conclusions This study first developed a validated, evidence-based scoring system based on lower-extremity angles of alignment to predict early clinical outcomes and to objectively evaluate the quality of TKA.
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Affiliation(s)
- Ziming Chen
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou City, 510080, Guangdong Province, China.,Centre for Orthopaedic Translational Research, Medical School, University of Western Australia, Nedlands, Australia
| | - Zhantao Deng
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou City, 510080, Guangdong Province, China
| | - Qingtian Li
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou City, 510080, Guangdong Province, China
| | - Junfeng Chen
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou City, 510080, Guangdong Province, China
| | - Yuanchen Ma
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou City, 510080, Guangdong Province, China.
| | - Qiujian Zheng
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou City, 510080, Guangdong Province, China.
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Bunzli S, O'Brien P, Klem N, Incoll I, Singh J, Davaris M, Choong P, Dowsey M. Misconceived expectations: Patient reflections on the total knee replacement journey. Musculoskeletal Care 2020; 18:415-424. [PMID: 32323918 DOI: 10.1002/msc.1475] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/08/2020] [Accepted: 04/10/2020] [Indexed: 12/30/2022]
Abstract
INTRODUCTION Fifty per cent of patients consent for total knee replacement (TKR) with unrealistic expectations about what it involves and can achieve. A framework is needed to help surgeons identify key knowledge gaps and misconceptions that can be targeted during the informed consent process. In this qualitative study, we explored knowledge gaps and misconceptions by asking patients to reflect on their expectations along the TKR journey. METHODS Eligible adults were ≥18 years, 12-month post-TKR and had completed a validated expectations questionnaire pre-TKR as part of a joint replacement registry. To capture a variety of perspectives, people with a range of pre-TKR expectation scores were invited. In interviews, participants reflected on anticipated and actual experiences and unexpected experiences they had along the way. Transcripts were analysed through inductive thematic analysis. Recruitment ceased when thematic saturation was reached. ETHICS APPROVAL Ethical approval for this study was granted by the St Vincent's Hospital Melbourne Ethics Committee (LRR 077/18). RESULTS In the final sample (n = 20; 50% female; median age = 72 years; contralateral TKR = 11), all participants described instances where their anticipated and actual experiences diverged, including high expectations of improvements in pain/function (pre-surgical optimism), lacking awareness about anaesthetic procedures (perioperative misunderstandings), feeling unprepared for the length of the recovery period (post-operative misestimations) and trying to make sense of ongoing functional limitations (long-term misattributions). DISCUSSION AND CONCLUSION These findings are captured in a preliminary framework of therapeutic misconception. Although future research is needed to test this framework prospectively in larger, more generalisable samples, surgeons can consider these key knowledge gaps and misconceptions when consenting for TKR.
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Affiliation(s)
- Samantha Bunzli
- Department of Surgery, St Vincent's Hospital Melbourne, The University of Melbourne, Melbourne, Victoria, Australia
| | - Penny O'Brien
- Department of Surgery, St Vincent's Hospital Melbourne, The University of Melbourne, Melbourne, Victoria, Australia
| | - Nardia Klem
- School of Physiotherapy and Exercise Science, Curtin University, Perth, Western Australia, Australia
| | - Ian Incoll
- Australian Orthopaedic Association, Sydney, New South Wales, Australia.,Faculty of Health and Medicine, University of Newcastle, Newcastle, New South Wales, Australia
| | - Jasvinder Singh
- Medicine Service, VA Medical Center, Birmingham, Alabama, USA.,Department of Medicine at the School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.,Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Myles Davaris
- Department of Surgery, St Vincent's Hospital Melbourne, The University of Melbourne, Melbourne, Victoria, Australia
| | - Peter Choong
- Department of Surgery, St Vincent's Hospital Melbourne, The University of Melbourne, Melbourne, Victoria, Australia.,Department of Orthopaedics, St. Vincent's Hospital, Melbourne, Victoria, Australia
| | - Michelle Dowsey
- Department of Surgery, St Vincent's Hospital Melbourne, The University of Melbourne, Melbourne, Victoria, Australia.,Department of Orthopaedics, St. Vincent's Hospital, Melbourne, Victoria, Australia
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Wilson HA, Middleton R, Abram SGF, Smith S, Alvand A, Jackson WF, Bottomley N, Hopewell S, Price AJ. Patient relevant outcomes of unicompartmental versus total knee replacement: systematic review and meta-analysis. BMJ 2019; 364:l352. [PMID: 30792179 PMCID: PMC6383371 DOI: 10.1136/bmj.l352] [Citation(s) in RCA: 175] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
OBJECTIVE To present a clear and comprehensive summary of the published data on unicompartmental knee replacement (UKA) or total knee replacement (TKA), comparing domains of outcome that have been shown to be important to patients and clinicians to allow informed decision making. DESIGN Systematic review using data from randomised controlled trials, nationwide databases or joint registries, and large cohort studies. DATA SOURCES Medline, Embase, Cochrane Controlled Register of Trials (CENTRAL), and Clinical Trials.gov, searched between 1 January 1997 and 31 December 2018. ELIGIBILITY CRITERIA FOR SELECTING STUDIES Studies published in the past 20 years, comparing outcomes of primary UKA with TKA in adult patients. Studies were excluded if they involved fewer than 50 participants, or if translation into English was not available. RESULTS 60 eligible studies were separated into three methodological groups: seven publications from six randomised controlled trials, 17 national joint registries and national database studies, and 36 cohort studies. Results for each domain of outcome varied depending on the level of data, and findings were not always significant. Analysis of the three groups of studies showed significantly shorter hospital stays after UKA than after TKA (-1.20 days (95% confidence interval -1.67 to -0.73), -1.43 (-1.53 to -1.33), and -1.73 (-2.30 to -1.16), respectively). There was no significant difference in pain, based on patient reported outcome measures (PROMs), but significantly better functional PROM scores for UKA than for TKA in both non-trial groups (mean difference -0.58 (-0.88 to -0.27) and -0.32 (-0.48 to -0.15), respectively). Regarding major complications, trials and cohort studies had non-significant results, but mortality after TKA was significantly higher in registry and large database studies (risk ratio 0.27 (0.16 to 0.45)), as were venous thromboembolic events (0.39 (0.27 to 0.57)) and major cardiac events (0.22 (0.06 to 0.86)). Early reoperation for any reason was higher after TKA than after UKA, but revision rates at five years remained higher for UKA in all three study groups (risk ratio 5.95 (1.29 to 27.59), 2.50 (1.77 to 3.54), and 3.13 (1.89 to 5.17), respectively). CONCLUSIONS TKA and UKA are both viable options for the treatment of isolated unicompartmental osteoarthritis. By directly comparing the two treatments, this study demonstrates better results for UKA in several outcome domains. However, the risk of revision surgery was lower for TKA. This information should be available to patients as part of the shared decision making process in choosing treatment options. SYSTEMATIC REVIEW REGISTRATION PROSPERO number CRD42018089972.
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Affiliation(s)
- Hannah A Wilson
- University of Oxford, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, BOTNAR Research Centre, Headington, Oxford OX3 7LD, UK
| | - Rob Middleton
- University of Oxford, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, BOTNAR Research Centre, Headington, Oxford OX3 7LD, UK
| | - Simon G F Abram
- University of Oxford, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, BOTNAR Research Centre, Headington, Oxford OX3 7LD, UK
| | - Stephanie Smith
- University of Oxford, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, BOTNAR Research Centre, Headington, Oxford OX3 7LD, UK
| | - Abtin Alvand
- University of Oxford, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, BOTNAR Research Centre, Headington, Oxford OX3 7LD, UK
| | - William F Jackson
- Oxford University Hospitals NHS Trust, Nuffield Orthopaedic Centre, Oxford, UK
| | - Nicholas Bottomley
- Oxford University Hospitals NHS Trust, Nuffield Orthopaedic Centre, Oxford, UK
| | - Sally Hopewell
- Centre for Statistics in Medicine, Oxford Clinical Trials Research Unit, Oxford, UK
| | - Andrew J Price
- University of Oxford, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, BOTNAR Research Centre, Headington, Oxford OX3 7LD, UK
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Rames RD, Mathison M, Meyer Z, Barrack RL, Nam D. No impact of under-correction and joint line obliquity on clinical outcomes of total knee arthroplasty for the varus knee. Knee Surg Sports Traumatol Arthrosc 2018; 26:1506-1514. [PMID: 28299385 DOI: 10.1007/s00167-017-4507-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 03/01/2017] [Indexed: 11/28/2022]
Abstract
PURPOSE It has been hypothesized that under-correction of a preoperative varus deformity may be more natural and improve outcomes after total knee arthroplasty (TKA). This study's purpose was to assess the impact of hip-knee-ankle (HKA) alignment and joint line obliquity on TKA outcomes for the varus knee. METHODS All patients with a preoperative varus deformity received both preoperative and postoperative standing, full-length radiographs from which two independent observers performed radiographic measurements including the HKA axis and mechanical medial proximal tibial angle (mMPTA). Patients were categorized based on their HKA into neutral (0° ± 3°), mild varus (-6° to -3°), severe varus (≤ -6°), and valgus (>3°) cohorts, and separately categorized based on their mMPTA into neutral (90° ± 2°), mild varus (86°-88°), severe varus (<86°), and valgus (>92°) cohorts. RESULTS Two hundred and fifty-six patients (mean age 63.8 ± 9.0 years, BMI 33.0 ± 6.2 kg/m2, follow-up 1.3 ± 0.6 years) were included. There was no difference in the postoperative SF-12 physical component, mental component, Oxford knee, Forgotten Joint Score, or incremental improvement in scores based on the postoperative alignment category for either the HKA or mMPTA. There was no correlation between the magnitude of change in HKA (r = 0.03-0.1) and mMPTA (r = 0.02-0.1) from preoperatively to postoperatively with clinical outcomes. CONCLUSIONS In patients undergoing TKA for a preoperative varus deformity, a specific postoperative HKA or mMPTA alignment category was not associated with improved outcomes. Therefore, categorization of optimal postoperative alignment after TKA may not be possible as static, coronal alignment is just one of many variables that can impact clinical outcomes. Future investigations focusing on the combination of static images with dynamic examinations and ligamentous balancing may shed further insight into the controversy and importance of coronal alignment following TKA. LEVEL OF EVIDENCE III.
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Affiliation(s)
- Richard D Rames
- Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, 660 S. Euclid Avenue, Campus Box 8233, St. Louis, MO, 63110, USA
| | - Michael Mathison
- Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, 660 S. Euclid Avenue, Campus Box 8233, St. Louis, MO, 63110, USA
| | - Zachary Meyer
- Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, 660 S. Euclid Avenue, Campus Box 8233, St. Louis, MO, 63110, USA
| | - Robert L Barrack
- Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, 660 S. Euclid Avenue, Campus Box 8233, St. Louis, MO, 63110, USA
| | - Denis Nam
- Department of Orthopedic Surgery, Rush University Medical Center, 1611 West Harrison Street, Suite 300, Chicago, IL, 60612, USA.
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