Arthur J. Only M.D. , Elizabeth A. Arendt M.D. , Betina B. Hinckel M.D., Ph.D.
{"title":"髌外侧不稳的解剖风险因素","authors":"Arthur J. Only M.D. , Elizabeth A. Arendt M.D. , Betina B. Hinckel M.D., Ph.D.","doi":"10.1016/j.arthro.2024.08.009","DOIUrl":null,"url":null,"abstract":"<div><div>With an incidence of approximately 42 per 100,000 persons annually, patellar instability is a debilitating condition that can result in dysfunction of the normal patellar tracking and potential cartilage damage. The stability of the patellofemoral (PF) joint involves an intricate relationship between muscular forces, soft tissues, trochlear and patellar geometry, and limb alignment. Several anatomic patellar risk factors (APRFs) have been identified including patella alta (Caton Deschamps >1.2; Insall-Salvati >1.2), rotational malalignment (femoral anteversion >30°, knee rotation >10°, and tibial rotation >35°), genu valgum (Valgus: zone 2 or greater), a lateralized tibial tubercle (tibial tubercle-trochlear grove distance >17 mm; tibial tubercle-posterior cruciate ligament distance >21 mm), and trochlear dysplasia. The importance of APRFs is highlighted by their overwhelming association with patellar instability; >80% of patients with patellar instability have at least 1 risk factor. Biomechanically, these risk factors increase lateralizing forces on the patella, increase maltracking (patellar tilt and subluxation), decrease contact area, and increase pressure in the PF joint. In addition, there is greater anisometry of the medial PF ligament reconstruction. Clinically, the presence of APRFs increases the chances of recurrence after a first episode as well as failure rates of medial PF ligament reconstruction. Initially described by Dejour on lateral radiographs, current APRF evaluation includes standard radiographs along with axial slice imaging, with magnetic resonance imaging being more commonly used currently. In some instances, mechanical axis radiographic views and axial computed tomography rotational alignment studies may be indicated. Each risk factor can be assessed independently, as there are good-quality studies defining abnormal thresholds for individual APRF. However, there is a lack of robust clinical data defining use of these thresholds for guiding decisions regarding nonsurgical/surgical treatment, specifically, which factors need to be surgically managed and at what threshold for optimal outcomes. It is important to understand that there is an intricate and complex interaction between risk factors that need to be considered during PF evaluation. Overall, evaluation of APRF is one of the core elements of PF instability management.</div></div>","PeriodicalId":55459,"journal":{"name":"Arthroscopy-The Journal of Arthroscopic and Related Surgery","volume":null,"pages":null},"PeriodicalIF":4.4000,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Anatomic Risk Factors for Lateral Patellar Instability\",\"authors\":\"Arthur J. Only M.D. , Elizabeth A. Arendt M.D. , Betina B. Hinckel M.D., Ph.D.\",\"doi\":\"10.1016/j.arthro.2024.08.009\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>With an incidence of approximately 42 per 100,000 persons annually, patellar instability is a debilitating condition that can result in dysfunction of the normal patellar tracking and potential cartilage damage. The stability of the patellofemoral (PF) joint involves an intricate relationship between muscular forces, soft tissues, trochlear and patellar geometry, and limb alignment. Several anatomic patellar risk factors (APRFs) have been identified including patella alta (Caton Deschamps >1.2; Insall-Salvati >1.2), rotational malalignment (femoral anteversion >30°, knee rotation >10°, and tibial rotation >35°), genu valgum (Valgus: zone 2 or greater), a lateralized tibial tubercle (tibial tubercle-trochlear grove distance >17 mm; tibial tubercle-posterior cruciate ligament distance >21 mm), and trochlear dysplasia. The importance of APRFs is highlighted by their overwhelming association with patellar instability; >80% of patients with patellar instability have at least 1 risk factor. Biomechanically, these risk factors increase lateralizing forces on the patella, increase maltracking (patellar tilt and subluxation), decrease contact area, and increase pressure in the PF joint. In addition, there is greater anisometry of the medial PF ligament reconstruction. Clinically, the presence of APRFs increases the chances of recurrence after a first episode as well as failure rates of medial PF ligament reconstruction. Initially described by Dejour on lateral radiographs, current APRF evaluation includes standard radiographs along with axial slice imaging, with magnetic resonance imaging being more commonly used currently. In some instances, mechanical axis radiographic views and axial computed tomography rotational alignment studies may be indicated. Each risk factor can be assessed independently, as there are good-quality studies defining abnormal thresholds for individual APRF. However, there is a lack of robust clinical data defining use of these thresholds for guiding decisions regarding nonsurgical/surgical treatment, specifically, which factors need to be surgically managed and at what threshold for optimal outcomes. It is important to understand that there is an intricate and complex interaction between risk factors that need to be considered during PF evaluation. Overall, evaluation of APRF is one of the core elements of PF instability management.</div></div>\",\"PeriodicalId\":55459,\"journal\":{\"name\":\"Arthroscopy-The Journal of Arthroscopic and Related Surgery\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.4000,\"publicationDate\":\"2024-10-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Arthroscopy-The Journal of Arthroscopic and Related Surgery\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0749806324005772\",\"RegionNum\":1,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ORTHOPEDICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Arthroscopy-The Journal of Arthroscopic and Related Surgery","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0749806324005772","RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ORTHOPEDICS","Score":null,"Total":0}
Anatomic Risk Factors for Lateral Patellar Instability
With an incidence of approximately 42 per 100,000 persons annually, patellar instability is a debilitating condition that can result in dysfunction of the normal patellar tracking and potential cartilage damage. The stability of the patellofemoral (PF) joint involves an intricate relationship between muscular forces, soft tissues, trochlear and patellar geometry, and limb alignment. Several anatomic patellar risk factors (APRFs) have been identified including patella alta (Caton Deschamps >1.2; Insall-Salvati >1.2), rotational malalignment (femoral anteversion >30°, knee rotation >10°, and tibial rotation >35°), genu valgum (Valgus: zone 2 or greater), a lateralized tibial tubercle (tibial tubercle-trochlear grove distance >17 mm; tibial tubercle-posterior cruciate ligament distance >21 mm), and trochlear dysplasia. The importance of APRFs is highlighted by their overwhelming association with patellar instability; >80% of patients with patellar instability have at least 1 risk factor. Biomechanically, these risk factors increase lateralizing forces on the patella, increase maltracking (patellar tilt and subluxation), decrease contact area, and increase pressure in the PF joint. In addition, there is greater anisometry of the medial PF ligament reconstruction. Clinically, the presence of APRFs increases the chances of recurrence after a first episode as well as failure rates of medial PF ligament reconstruction. Initially described by Dejour on lateral radiographs, current APRF evaluation includes standard radiographs along with axial slice imaging, with magnetic resonance imaging being more commonly used currently. In some instances, mechanical axis radiographic views and axial computed tomography rotational alignment studies may be indicated. Each risk factor can be assessed independently, as there are good-quality studies defining abnormal thresholds for individual APRF. However, there is a lack of robust clinical data defining use of these thresholds for guiding decisions regarding nonsurgical/surgical treatment, specifically, which factors need to be surgically managed and at what threshold for optimal outcomes. It is important to understand that there is an intricate and complex interaction between risk factors that need to be considered during PF evaluation. Overall, evaluation of APRF is one of the core elements of PF instability management.
期刊介绍:
Nowhere is minimally invasive surgery explained better than in Arthroscopy, the leading peer-reviewed journal in the field. Every issue enables you to put into perspective the usefulness of the various emerging arthroscopic techniques. The advantages and disadvantages of these methods -- along with their applications in various situations -- are discussed in relation to their efficiency, efficacy and cost benefit. As a special incentive, paid subscribers also receive access to the journal expanded website.