[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-447424-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-447424-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","post-traumatic-patellofemoral-ankylosis-treated-with-robotic-arm-assisted-patellofemoral-arthroplasty-a-case-report","Post-traumatic Patellofemoral Ankylosis treated with Robotic Arm Assisted Patellofemoral Arthroplasty - A Case Report","","Case report of a 21-year-old male with post-traumatic bony patellofemoral ankylosis and quadriceps contracture treated with robotic arm-assisted patellofemoral arthroplasty (RA-PFA) and quadriceps-plasty. Preoperatively, he had a 20° flexion deformity with no further active flexion or extension, while passive extension from 20° to 0° was possible. At 2-year follow-up, he was independently ambulant with improved pain and functional scores, and gained active motion of 0°–80° without extension lag.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/healthcare/","Healthcare",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/post-traumatic-patellofemoral-ankylosis-treated-with-robotic-arm-assisted-patellofemoral-arthroplasty-a-case-report/447424/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/post-traumatic-patellofemoral-ankylosis-treated-with-robotic-arm-assisted-patellofemoral-arthroplasty-a-case-report/447424.png","ImageObject",300,407,{"name":42,"@type":43},"LangkahRina","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-09-29",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",7,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What surgical option is highlighted for grossly distorted knee anatomy in this article?","Question",{"text":63,"@type":64},"Robotic-arm-assisted patellofemoral arthroplasty is presented as a viable option for grossly distorted knee anatomy, such as post-traumatic patellofemoral ankylosis.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What were the patient’s key preoperative knee findings?",{"text":68,"@type":64},"The patient had a 20° flexion deformity and no further active flexion or extension; passive extension from 20° to 0° was possible, with no active extension.",{"name":70,"@type":61,"acceptedAnswer":71},"What outcomes were reported at the 2-year follow-up?",{"text":72,"@type":64},"At 2 years, the patient was independently ambulant with good improvement in pain and functional clinical scores, and improved active flexion of 0°–80° and active extension of 80°–0° without extension lag.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},447424,1790762805,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":107,"slug":108},40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":55,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":97,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":143,"read_time":144,"preview_page_count":4},962090893776,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Case Report  Journal of Orthopaedic Case Reports 2025 December:15( 12) :Page 253-257   \nPost-traumatic PatellofemoralAnkylosis treated with Robotic Arm Assisted Patellofemoral Arthroplasty –A Case Report  \nJishnuV Namboodiripad1, Thadi Mohan1  \nLearning Point of the Article:  \nRobotic-arm-assisted patellofemoral arthroplasty is a viable surgical option in grossly distorted knee anatomy, such as in post-traumatic  \npatellofemoral ankylosis.  \nAbstract  \nIntroduction: This case report describes the procedure and 2-year outcome in a patient with bony patellofemoral ankylosis who underwent robotic arm-assisted patellofemoral arthroplasty (RA-PFA).  \nCase Report: A 21-year-old male with Post-traumatic Patellofemoral Ankylosis with quadriceps contracture underwent RA-PFA with Quadriceps-plasty. Preoperatively, the patient had a flexion deformity of 20°with no further active flexion or extension. Passive knee extension from 20° to 0° was possible. At 2-years follow-up, he was independently ambulantwith good improvement in pain and functional clinical scores. He had an improved active flexion of 0°–80°and active extension of 80°–0°with no extension lag.  \nConclusion: This case suggests RA-PFA maybe an effective intervention to restore knee function in Post-traumatic PatellofemoralAnkylosis despitethe grossly altered anatomy.  \nKeywords: Osseousankylosis knee, patellofemoral implant, robotic arm-assisted patellofemoral arthroplasty, quadriceps-plasty.  \nIntroduction  \nKnee stiffness resulting from patellofemoral ankylosis is a rare complication of high-energy trauma and poses a difficult challenge to the surgeon, as there is no established treatment protocol to date [1]. Post-traumatic stiffness of the knee in extension causes severe disability to the patient by interfering with activities of daily living. While patellectomy has been proposed as an alternative treatment, its unfavorable impact on quadriceps strength, leading to laxity and increased extensor lag, raises concerns [2, 3]. An osteotomy of the patellofemoral fusion will inevitably lead to refusion, due to the cancellous surfaces exposed. Previous attempts atpatellar resurfacing using fascia, fat  \npad, or skin patches have yielded unreliable results as well [4,5,6,7].  \nPatellofemoral arthroplasty (PFA) has gained recognition as an effective intervention for isolated patellofemoral arthritis, although its role in addressing Post-traumatic Patellofemoral Ankylosis remains undocumented.  \nWe performed a robotic-arm-assisted PFA (RA-PFA)ina case of Post-traumatic Bony Patellofemoral Ankylosis, utilizing a 3D computed tomography (CT) based image for pre-operative planning. The patient had achieved excellent function at his 2-years follow-up. This approach aims to enhance procedural precision, ensuring accurate component placement, achieve  \n\n| \u003Cbr>Access this article online\u003Cbr>\u003Cbr>Website: [www.jocr.co.in](www.jocr.co.in)\u003Cbr>\u003Cbr>DOI:\u003Cbr>[https://doi.org/10.13107/jocr.2025.v15.i12.6526](https://doi.org/10.13107/jocr.2025.v15.i12.6526) | Author’s Photo Gallery |  |\n| --- | --- | --- |\n|  | | |\n|  | \u003Cbr>1Department of Orthopedics, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, Kerala, India.\u003Cbr>Address of Correspondence:\u003Cbr>Dr. Thadi Mohan,\u003Cbr>Department of Orthopedics, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, Kerala, India.\u003Cbr>E-mail: [thadimohan@gmail.com](thadimohan@gmail.com) |  |\n| Submitted: 11/09/2025; Review: 21/10/2025; Accepted: November 2025; Published: December 2025 |  |  |\n| DOI: [https://doi.org/10.13107/jocr.2025.v15.i12.6526](https://doi.org/10.13107/jocr.2025.v15.i12.6526)\u003Cbr>© The Author(s). 2025 Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License ([https://creativecommons.org/licenses/by-nc/4.0/](https://creativecommons.org/licenses/by-nc/4.0/)), which permits unrestricted use, distribution, and non-commercial reproduction in any medium, p","cbCaieYPQ8CLNdON","https://ap.wps.com/l/cbCaieYPQ8CLNdON","pdf",7653158,"English","# Learning Point of the Article\n# Abstract\n## Introduction\n## Case Report\n## Conclusion\n# Keywords\n# Introduction\n# Case Report","[{\"question\":\"What surgical option is highlighted for grossly distorted knee anatomy in this article?\",\"answer\":\"Robotic-arm-assisted patellofemoral arthroplasty is presented as a viable option for grossly distorted knee anatomy, such as post-traumatic patellofemoral ankylosis.\"},{\"question\":\"What were the patient’s key preoperative knee findings?\",\"answer\":\"The patient had a 20° flexion deformity and no further active flexion or extension; passive extension from 20° to 0° was possible, with no active extension.\"},{\"question\":\"What outcomes were reported at the 2-year follow-up?\",\"answer\":\"At 2 years, the patient was independently ambulant with good improvement in pain and functional clinical scores, and improved active flexion of 0°–80° and active extension of 80°–0° without extension lag.\"}]","Post-traumatic Patellofemoral Ankylosis treated with Robotic Arm Assisted Patellofemoral Arthroplasty - A Case Report | PDF",1790720306,13]