• Matthieu Lalevée, Barbachan MansurNacime SalomaoNS0000-0003-1067-727XDepartment of Orthopaedic and Rehabilitation, Lower Level, University of Iowa, Carver College of Medicine, John PappaJohn Pavillion (JPP), 200 Hawkins DrRoom 01066, Iowa City, IA, 52242, USA.Department of, Edward O Rojas, Hee Young Lee, Samuel J Ahrenholz, Kevin N Dibbern, François Lintz, and Cesar de Cesar Netto.
• Department of Orthopaedic and Rehabilitation, Lower Level, University of Iowa, Carver College of Medicine, John PappaJohn Pavillion (JPP), 200 Hawkins DrRoom 01066, Iowa City, IA, 52242, USA. matthieu-lalevee@uiowa.edu.
• Arch Orthop Trauma Surg. 2023 Jan 1; 143 (1): 161168161-168.

IntroductionThe prevalence of lateral bony impingements [i.e., Sinus Tarsi (STI), Talo-Fibular (TFI) and Calcaneo-Fibular (CFI)] and their association with Peritalar Subluxation (PTS) have not been clearly established for progressive collapsing foot deformity (PCFD).This study aims to assess the prevalence of STI, TFI and CFI in PCFD, in addition to their association with PTS. We hypothesized that STI and TFI would be more prevalent than CFI.Materials And MethodsSeventy-two continuous symptomatic PCFD cases were retrospectively reviewed. Weightbearing computed tomography (WBCT) was used to assess lateral impingements and classified as STI, TFI and CFI. PTS was assessed by the percent of uncovered and the incongruence angle of the middle facet, and the overall foot deformity was determined by the foot and ankle offset (FAO). Data were collected by two fellowship-trained independent observers.ResultsIntra-observer and inter-observer reliabilities for impingement assessment ranged from substantial to almost perfect. STI was present in 84.7%, TFI in 65.2% and CFI in 19.4%. PCFD with STI showed increased middle facet uncoverage (p = 0.0001) and FAO (p = 0.0008) compared to PCFD without STI. There were no differences in FAO and middle facet uncoverage in PCFD with TFI and without TFI. PCFD with CFI was associated with STI in 100% of cases. PCFD with CFI showed decreased middle facet incongruence (p = 0.04) and higher FAO (p = 0.006) compared to PCFD without CFI.ConclusionsSTI and TFI were more prevalent than CFI in PCFD. However, only STI was associated with PTS. Conversely, CFI was associated with less PTS, suggesting a different pathological mechanism which could be a compensatory subtalar behavior caused by deep layer failure of the deltoid ligament and talar tilt.© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

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