Abstract
Introduction
The 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 methods
Seventy-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.
Results
Intra-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.
Conclusions
STI 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.
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Matthieu Lalevée received an international mobility grant from GCS-G4 (Lille, France).
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François Lintz; personal fees from Curvebeam; patent TALAS issued. Cesar de Cesar Netto: paid consultant to Curvebeam, Ossio, Zimmer-Biomet, Nextremity, Paragon 28; stock options with Curvebeam; royalties from Paragon 28; media board member with Foot & Ankle International, treasurer for International WBCT Society, committee member for American Orthopaedic Foot & Ankle Society, Editor-in-Chief Foot and Ankle Clinics.
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Lalevée, M., Barbachan Mansur, N.S., Rojas, E.O. et al. Prevalence and pattern of lateral impingements in the progressive collapsing foot deformity. Arch Orthop Trauma Surg 143, 161–168 (2023). https://doi.org/10.1007/s00402-021-04015-7
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DOI: https://doi.org/10.1007/s00402-021-04015-7