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Published on: March 4, 2018
Clinical validity of radiographic parameters for evaluating pediatric foot deformities: correlation with
Woo Sub Kim1, Gyu Hwan Lee2, Min Sub Kim3
1Department of Orthopaedic Surgery, KonKuk University Medical Center, Seoul, Republic of Korea.
Backgrounds:
Pediatric foot deformities disrupt biomechanics and can lead to long-term musculoskeletal complications. Radiographic parameters, particularly the anteroposterior talo-1st metatarsal angle (AP talo-1MT), are widely used; however, their accuracy may be compromised in the presence of hallux valgus. The clinical utility of the anteroposterior talo-2nd metatarsal angle (AP talo-2MT) has not been well established. This study evaluated radiographic parameters by correlating them with pedobarographic indices, hypothesizing that AP talo-2MT would demonstrate comparable or superior functional associations to AP talo-1MT.
Methods:
We retrospectively reviewed 64 pediatric patients with hindfoot varus (n = 32) or valgus (n = 32) deformities who underwent weight-bearing radiographs and pedobarographic testing between 2017 and 2024. Radiographic variables included AP talo-1MT, AP talo-2MT, talonavicular coverage, hallux valgus angle, intermetatarsal angle, lateral talo-1MT, calcaneal pitch, and naviculocuboid overlap. Pedobarographic outcomes comprised surface area, mean pressure, and pressure-time integral across forefoot, midfoot, and hindfoot regions. Interobserver reliability was assessed using intraclass correlation coefficients (ICCs). Group differences were analyzed with t-tests and effect sizes, and age-adjusted partial correlations were calculated to evaluate associations.
Results:
All radiographic parameters demonstrated excellent reliability (ICC 0.872-0.996). Significant differences were observed in AP talo-1MT, AP talo-2MT, lateral talo-1MT, and naviculocuboid overlap between hindfoot varus and valgus groups (all p < 0.001). Pedobarographic analysis revealed distinct loading patterns, especially in midfoot and lateral regions. Both AP talo-1MT and AP talo-2MT correlated with total foot surface area and midfoot loading indices; AP talo-2MT demonstrated comparable associations and larger discriminative effect sizes between hindfoot varus and valgus.
Conclusion:
AP talo-2MT demonstrated excellent reliability and showed comparable functional associations to AP talo-1MT. It may be a useful complementary radiographic parameter for evaluating pediatric foot deformities, but further validation in broader cohorts and predefined subgroups is needed.
Level Of Evidence:
Level III, retrospective cross-sectional study.
