Marc Khalifé, Renaud Lafage, Alan H Daniels, Bassel G Diebo, Jonathan Elysée, Christopher P Ames, Shay R Bess, Douglas C Burton, Robert K Eastlack, Munish C Gupta, Richard A Hostin, Khaled Kebaish, Han-Jo Kim, Eric O Klineberg, Gregory Mundis, David O Okonkwo, Olivier Gille, Pierre Guigui, Emmanuelle Ferrero, Wafa Skalli, Ayman Assi, Claudio Vergari, Christopher I Shaffrey, Justin S Smith, Frank J Schwab, Virginie Lafage
{"title":"评估成人脊柱畸形的近端连接角异常：定义近端交界性脊柱后凸的规范数据方法。","authors":"Marc Khalifé, Renaud Lafage, Alan H Daniels, Bassel G Diebo, Jonathan Elysée, Christopher P Ames, Shay R Bess, Douglas C Burton, Robert K Eastlack, Munish C Gupta, Richard A Hostin, Khaled Kebaish, Han-Jo Kim, Eric O Klineberg, Gregory Mundis, David O Okonkwo, Olivier Gille, Pierre Guigui, Emmanuelle Ferrero, Wafa Skalli, Ayman Assi, Claudio Vergari, Christopher I Shaffrey, Justin S Smith, Frank J Schwab, Virginie Lafage","doi":"10.1097/BRS.0000000000005141","DOIUrl":null,"url":null,"abstract":"<p><strong>Study design: </strong>Multicentric retrospective study of prospectively collected data.</p><p><strong>Objective: </strong>On the basis of normative data from a cohort of asymptomatic volunteers, this study sought to determine the rate of abnormal values of proximal junctional angles (PJA) in adult spinal deformity (ASD) surgery patients, and compare it with PJK rate.</p><p><strong>Summary of background data: </strong>Proximal junctional kyphosis (PJK) definition does not take the vertebral level into account.</p><p><strong>Patients and methods: </strong>This study included 721 healthy volunteers and 824 ASD surgery patients with two-year postoperative follow-up. Normative values for each disc and vertebral body between T1 and T12 were analyzed, then normative values for PJA at each thoracic level were defined in the volunteer cohort as the mean±2SD. PJA abnormal values at the upper instrumented vertebra (UIV) were compared with Glattes' and Lovecchio's definitions for PJK in the ASD population at two years.</p><p><strong>Results: </strong>Mean age was 37.7±16.3 in the volunteer cohort, with 50.5% of females. Mean thoracic kyphosis (TK) was -50.9±10.8°. Corridors of normality included PJA greater than 20° between T3 and T12. Mean age was 60.5±14.0 years in the ASD cohort, with 77.2% of females. Mean baseline TK was -37.4±19.9°, with a significant increase after surgery (-15.6±15.3°, P <0.001). There was 46.2% of PJK according to Glattes' versus 8.7% according to Lovecchio's and 22.9% of kyphotic PJA compared with normative values ( P <0.001).</p><p><strong>Conclusion: </strong>This study provides normative values for segmental and regional alignment of thoracic spine, used to describe abnormal values of PJA for each level. Using level-adjusted PJA values allows a more precise assessment of abnormal proximal angles and question the definition for PJK.</p><p><strong>Level of evidence: </strong>Level II.</p>","PeriodicalId":22193,"journal":{"name":"Spine","volume":" ","pages":"103-109"},"PeriodicalIF":2.6000,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Assessing Abnormal Proximal Junctional Angles in Adult Spinal Deformity: A Normative Data Approach to Define Proximal Junctional Kyphosis.\",\"authors\":\"Marc Khalifé, Renaud Lafage, Alan H Daniels, Bassel G Diebo, Jonathan Elysée, Christopher P Ames, Shay R Bess, Douglas C Burton, Robert K Eastlack, Munish C Gupta, Richard A Hostin, Khaled Kebaish, Han-Jo Kim, Eric O Klineberg, Gregory Mundis, David O Okonkwo, Olivier Gille, Pierre Guigui, Emmanuelle Ferrero, Wafa Skalli, Ayman Assi, Claudio Vergari, Christopher I Shaffrey, Justin S Smith, Frank J Schwab, Virginie Lafage\",\"doi\":\"10.1097/BRS.0000000000005141\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Study design: </strong>Multicentric retrospective study of prospectively collected data.</p><p><strong>Objective: </strong>On the basis of normative data from a cohort of asymptomatic volunteers, this study sought to determine the rate of abnormal values of proximal junctional angles (PJA) in adult spinal deformity (ASD) surgery patients, and compare it with PJK rate.</p><p><strong>Summary of background data: </strong>Proximal junctional kyphosis (PJK) definition does not take the vertebral level into account.</p><p><strong>Patients and methods: </strong>This study included 721 healthy volunteers and 824 ASD surgery patients with two-year postoperative follow-up. Normative values for each disc and vertebral body between T1 and T12 were analyzed, then normative values for PJA at each thoracic level were defined in the volunteer cohort as the mean±2SD. PJA abnormal values at the upper instrumented vertebra (UIV) were compared with Glattes' and Lovecchio's definitions for PJK in the ASD population at two years.</p><p><strong>Results: </strong>Mean age was 37.7±16.3 in the volunteer cohort, with 50.5% of females. Mean thoracic kyphosis (TK) was -50.9±10.8°. Corridors of normality included PJA greater than 20° between T3 and T12. Mean age was 60.5±14.0 years in the ASD cohort, with 77.2% of females. Mean baseline TK was -37.4±19.9°, with a significant increase after surgery (-15.6±15.3°, P <0.001). There was 46.2% of PJK according to Glattes' versus 8.7% according to Lovecchio's and 22.9% of kyphotic PJA compared with normative values ( P <0.001).</p><p><strong>Conclusion: </strong>This study provides normative values for segmental and regional alignment of thoracic spine, used to describe abnormal values of PJA for each level. Using level-adjusted PJA values allows a more precise assessment of abnormal proximal angles and question the definition for PJK.</p><p><strong>Level of evidence: </strong>Level II.</p>\",\"PeriodicalId\":22193,\"journal\":{\"name\":\"Spine\",\"volume\":\" \",\"pages\":\"103-109\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2025-01-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Spine\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1097/BRS.0000000000005141\",\"RegionNum\":2,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2024/10/1 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q2\",\"JCRName\":\"CLINICAL NEUROLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Spine","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1097/BRS.0000000000005141","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/10/1 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"CLINICAL NEUROLOGY","Score":null,"Total":0}
Assessing Abnormal Proximal Junctional Angles in Adult Spinal Deformity: A Normative Data Approach to Define Proximal Junctional Kyphosis.
Study design: Multicentric retrospective study of prospectively collected data.
Objective: On the basis of normative data from a cohort of asymptomatic volunteers, this study sought to determine the rate of abnormal values of proximal junctional angles (PJA) in adult spinal deformity (ASD) surgery patients, and compare it with PJK rate.
Summary of background data: Proximal junctional kyphosis (PJK) definition does not take the vertebral level into account.
Patients and methods: This study included 721 healthy volunteers and 824 ASD surgery patients with two-year postoperative follow-up. Normative values for each disc and vertebral body between T1 and T12 were analyzed, then normative values for PJA at each thoracic level were defined in the volunteer cohort as the mean±2SD. PJA abnormal values at the upper instrumented vertebra (UIV) were compared with Glattes' and Lovecchio's definitions for PJK in the ASD population at two years.
Results: Mean age was 37.7±16.3 in the volunteer cohort, with 50.5% of females. Mean thoracic kyphosis (TK) was -50.9±10.8°. Corridors of normality included PJA greater than 20° between T3 and T12. Mean age was 60.5±14.0 years in the ASD cohort, with 77.2% of females. Mean baseline TK was -37.4±19.9°, with a significant increase after surgery (-15.6±15.3°, P <0.001). There was 46.2% of PJK according to Glattes' versus 8.7% according to Lovecchio's and 22.9% of kyphotic PJA compared with normative values ( P <0.001).
Conclusion: This study provides normative values for segmental and regional alignment of thoracic spine, used to describe abnormal values of PJA for each level. Using level-adjusted PJA values allows a more precise assessment of abnormal proximal angles and question the definition for PJK.
期刊介绍：
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Recognized internationally as the leading journal in its field, Spine is an international, peer-reviewed, bi-weekly periodical that considers for publication original articles in the field of Spine. It is the leading subspecialty journal for the treatment of spinal disorders. Only original papers are considered for publication with the understanding that they are contributed solely to Spine. The Journal does not publish articles reporting material that has been reported at length elsewhere.
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