{"id":19149,"date":"2026-05-29T14:17:27","date_gmt":"2026-05-29T12:17:27","guid":{"rendered":"https:\/\/centre-assal.ch\/?post_type=publications&#038;p=19149"},"modified":"2026-05-29T14:17:27","modified_gmt":"2026-05-29T12:17:27","slug":"weightbearing-ct-based-predictive-surgical-planning-for-joint-sparing-reconstruction-of-progressive-collapsing-foot-deformity","status":"publish","type":"publications","link":"https:\/\/centre-assal.ch\/en\/publications\/weightbearing-ct-based-predictive-surgical-planning-for-joint-sparing-reconstruction-of-progressive-collapsing-foot-deformity\/","title":{"rendered":"Weightbearing CT-based predictive surgical planning for joint-sparing reconstruction of progressive collapsing foot deformity"},"content":{"rendered":"<section class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--header-height)\" dir=\"auto\" data-turn-id=\"13db4126-1499-4b66-9851-1ccff0524b63\" data-turn-id-container=\"13db4126-1499-4b66-9851-1ccff0524b63\" data-testid=\"conversation-turn-1\" data-scroll-anchor=\"false\" data-turn=\"user\"><\/section>\n<section class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:71df295d-b4ea-4d59-be2e-956ea9775449-0\" data-turn-id-container=\"request-WEB:71df295d-b4ea-4d59-be2e-956ea9775449-0\" data-testid=\"conversation-turn-2\" data-scroll-anchor=\"false\" data-turn=\"assistant\">\n<div class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\">\n<div class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\">\n<div class=\"flex max-w-full flex-col gap-4 grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&amp;]:mt-1\" dir=\"auto\" tabindex=\"0\" data-message-author-role=\"assistant\" data-message-id=\"37cd4c1b-304a-47c4-83fe-79a730e9f226\" data-message-model-slug=\"gpt-5-5\" data-turn-start-message=\"true\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden\">\n<div class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\">\n<p data-start=\"0\" data-end=\"12\"><strong data-start=\"0\" data-end=\"12\">ABSTRACT<\/strong><\/p>\n<p data-start=\"14\" data-end=\"305\"><strong data-start=\"14\" data-end=\"29\">Background:<\/strong> Progressive Collapsing Foot Deformity (PCFD) is a complex multiplanar deformity commonly treated with osteotomy-based reconstruction in flexible cases. Although weight-bearing CT (WBCT) has improved assessment of PCFD, WBCT-based predictive planning models remain unexplored.<\/p>\n<p data-start=\"307\" data-end=\"477\"><strong data-start=\"307\" data-end=\"319\">Purpose:<\/strong> To evaluate the accuracy of a WBCT-based predictive surgical planning model in estimating postoperative alignment following reconstruction for flexible PCFD.<\/p>\n<p data-start=\"479\" data-end=\"524\"><strong data-start=\"479\" data-end=\"496\">Study design:<\/strong> Retrospective cohort study.<\/p>\n<p data-start=\"526\" data-end=\"1181\"><strong data-start=\"526\" data-end=\"538\">Methods:<\/strong> Thirty-four patients with PCFD who underwent reconstruction with medial displacement calcaneal osteotomy, lateral column lengthening, and\/or first-ray plantarflexion osteotomy and had preoperative and 3-month postoperative WBCT were included. The model estimated postoperative hindfoot moment arm (HMA), axial talus\u2212first metatarsal angle (TFMA-A), talonavicular coverage angle (TNCA), and sagittal talus\u2212first metatarsal angle (TFMA-S) using correction magnitudes. Predicted alignment was compared with postoperative WBCT measurements using Bland\u2212Altman analysis, mean absolute error (MAE), root-mean-square error (RMSE), and paired t-tests.<\/p>\n<p data-start=\"1183\" data-end=\"1653\"><strong data-start=\"1183\" data-end=\"1195\">Results:<\/strong> Predictive accuracy was highest for HMA, with a mean bias of +2.73 mm (<em data-start=\"1267\" data-end=\"1270\">p<\/em> = 0.005), narrowest limits of agreement (\u22127.66 mm to +13.12 mm), and lowest MAE and RMSE values (approximately 2.9 mm and 3.7 mm). TFMA-A, TNCA, and TFMA-S demonstrated wider limits of agreement (approximately \u221217\u00b0 to +21\u00b0) and greater case-level variability, although no significant systematic differences between predicted and postoperative values were observed (<em data-start=\"1636\" data-end=\"1639\">p<\/em> = 0.21\u20130.90).<\/p>\n<p data-start=\"1655\" data-end=\"2049\" data-is-last-node=\"\" data-is-only-node=\"\"><strong data-start=\"1655\" data-end=\"1671\">Conclusions:<\/strong> A WBCT-based predictive surgical planning model estimated postoperative alignment accurately for hindfoot valgus correction, while predictions of midfoot\/forefoot abduction and arch collapse demonstrated greater individual variability. Despite this variability, the model accurately reproduced mean multiplanar correction, supporting patient-specific surgical planning in PCFD.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n","protected":false},"featured_media":0,"template":"","categorie_publications":[89],"class_list":["post-19149","publications","type-publications","status-publish","hentry","categorie_publications-article-scientifique"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Weightbearing CT-based predictive surgical planning for joint-sparing reconstruction of progressive collapsing foot deformity - Centre Assal<\/title>\n<meta name=\"description\" content=\"Progressive Collapsing Foot Deformity (PCFD) is a complex multiplanar deformity commonly treated with osteotomy-based reconstruction in flexible cases. 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