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Accuracy of Manual Surgeon-Defined Assessment of Soft Tissue Balance in TKA In Comparison to Sensor-Guided Measures and its Effect on Final Balance
OBJECTIVES: Present literature supports the importance of final alignment and soft tissue balance in total knee arthroplasty (TKA) on implant survivorship and clinical outcomes. Current soft tissue balance techniques mostly depend on subjective static measures that don’t allow for quantitative deter...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
SAGE Publications
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5455895/ http://dx.doi.org/10.1177/2325967117S00161 |
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author | MacDessi, Samuel Gharaibeh, Monther |
author_facet | MacDessi, Samuel Gharaibeh, Monther |
author_sort | MacDessi, Samuel |
collection | PubMed |
description | OBJECTIVES: Present literature supports the importance of final alignment and soft tissue balance in total knee arthroplasty (TKA) on implant survivorship and clinical outcomes. Current soft tissue balance techniques mostly depend on subjective static measures that don’t allow for quantitative determination of ligament tension. Sensor guided technique (Verasense, Orthosensor) allows demonstration of the magnitude and location of load in a dynamic way providing quantitative data about knee balance. The aim of this study is to test the accuracy of the surgeon’s manual assessment in judging knee balance in comparison to Verasense. We also aimed to determine whether Verasense can assist in achieving soft tissue balance from the unbalanced state. METHODS: 58 patients were enrolled in this prospective cohort study. The level of agreement between SDA and Verasense at 10, 45, 90 degrees was recorded. Initial trial pressures and final pressures after release or re-cut were recorded and compared. Final pressure measurements were then documented to assess whether appropriate knee balance (differential compartmental pressure of 15 lb/inch on 2 or more angular positions) had been achieved. RESULTS: The mean age of the cohort was 67.5 years with deformities ranging from -16 degrees of varus to +20 degrees of valgus (mean -1.26 degrees varus). The capacity for the surgeon to manually identify an unbalanced knee was low with a test sensitivity of 33.3%. Manual test specificity to define a balanced knee was better with a specificity of 77.3%. The manual test had a positive predicitive value of 59.2% and a negative predictive value of 54%. There were 46.5% (27 of 58) of cases where the Verasense lead to a different surgical plan to that initially determined by the manual assessment. In 23 cases, either ligament release or tibial bone recut was performed. In the remaining 4 cases, the Verasense prevented a ligament release being performed. 95% of cases achieved a balanced state within 15lb/inch of pressure between compartments, with 100% balanced within 25 lb/inch. CONCLUSION: Manual surgeon assessment of soft tissue balance is a poor predictor of unbalanced knees. Verasense has the capacity to subsequently balance the knee within an acceptable pressure range as defined by prior studies. Further analysis to determine the impact on patient outcomes and implant survivorship is warranted. |
format | Online Article Text |
id | pubmed-5455895 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | SAGE Publications |
record_format | MEDLINE/PubMed |
spelling | pubmed-54558952017-06-12 Accuracy of Manual Surgeon-Defined Assessment of Soft Tissue Balance in TKA In Comparison to Sensor-Guided Measures and its Effect on Final Balance MacDessi, Samuel Gharaibeh, Monther Orthop J Sports Med Article OBJECTIVES: Present literature supports the importance of final alignment and soft tissue balance in total knee arthroplasty (TKA) on implant survivorship and clinical outcomes. Current soft tissue balance techniques mostly depend on subjective static measures that don’t allow for quantitative determination of ligament tension. Sensor guided technique (Verasense, Orthosensor) allows demonstration of the magnitude and location of load in a dynamic way providing quantitative data about knee balance. The aim of this study is to test the accuracy of the surgeon’s manual assessment in judging knee balance in comparison to Verasense. We also aimed to determine whether Verasense can assist in achieving soft tissue balance from the unbalanced state. METHODS: 58 patients were enrolled in this prospective cohort study. The level of agreement between SDA and Verasense at 10, 45, 90 degrees was recorded. Initial trial pressures and final pressures after release or re-cut were recorded and compared. Final pressure measurements were then documented to assess whether appropriate knee balance (differential compartmental pressure of 15 lb/inch on 2 or more angular positions) had been achieved. RESULTS: The mean age of the cohort was 67.5 years with deformities ranging from -16 degrees of varus to +20 degrees of valgus (mean -1.26 degrees varus). The capacity for the surgeon to manually identify an unbalanced knee was low with a test sensitivity of 33.3%. Manual test specificity to define a balanced knee was better with a specificity of 77.3%. The manual test had a positive predicitive value of 59.2% and a negative predictive value of 54%. There were 46.5% (27 of 58) of cases where the Verasense lead to a different surgical plan to that initially determined by the manual assessment. In 23 cases, either ligament release or tibial bone recut was performed. In the remaining 4 cases, the Verasense prevented a ligament release being performed. 95% of cases achieved a balanced state within 15lb/inch of pressure between compartments, with 100% balanced within 25 lb/inch. CONCLUSION: Manual surgeon assessment of soft tissue balance is a poor predictor of unbalanced knees. Verasense has the capacity to subsequently balance the knee within an acceptable pressure range as defined by prior studies. Further analysis to determine the impact on patient outcomes and implant survivorship is warranted. SAGE Publications 2017-05-31 /pmc/articles/PMC5455895/ http://dx.doi.org/10.1177/2325967117S00161 Text en © The Author(s) 2017 http://creativecommons.org/licenses/by-nc-nd/3.0/ This open-access article is published and distributed under the Creative Commons Attribution - NonCommercial - No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/3.0/), which permits the noncommercial use, distribution, and reproduction of the article in any medium, provided the original author and source are credited. You may not alter, transform, or build upon this article without the permission of the Author(s). For reprints and permission queries, please visit SAGE’s Web site at http://www.sagepub.com/journalsPermissions.nav. |
spellingShingle | Article MacDessi, Samuel Gharaibeh, Monther Accuracy of Manual Surgeon-Defined Assessment of Soft Tissue Balance in TKA In Comparison to Sensor-Guided Measures and its Effect on Final Balance |
title | Accuracy of Manual Surgeon-Defined Assessment of Soft Tissue Balance in TKA In Comparison to Sensor-Guided Measures and its Effect on Final Balance |
title_full | Accuracy of Manual Surgeon-Defined Assessment of Soft Tissue Balance in TKA In Comparison to Sensor-Guided Measures and its Effect on Final Balance |
title_fullStr | Accuracy of Manual Surgeon-Defined Assessment of Soft Tissue Balance in TKA In Comparison to Sensor-Guided Measures and its Effect on Final Balance |
title_full_unstemmed | Accuracy of Manual Surgeon-Defined Assessment of Soft Tissue Balance in TKA In Comparison to Sensor-Guided Measures and its Effect on Final Balance |
title_short | Accuracy of Manual Surgeon-Defined Assessment of Soft Tissue Balance in TKA In Comparison to Sensor-Guided Measures and its Effect on Final Balance |
title_sort | accuracy of manual surgeon-defined assessment of soft tissue balance in tka in comparison to sensor-guided measures and its effect on final balance |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5455895/ http://dx.doi.org/10.1177/2325967117S00161 |
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