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Ossification of the posterior longitudinal ligament is linked to heterotopic ossification of the ankle/foot tendons
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Ossification of the posterior longitudinal ligament is linked to heterotopic ossification of the ankle/foot tendons
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Ossification of the posterior longitudinal ligament is linked to heterotopic ossification of the ankle/foot tendons
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Journal Article
Ossification of the posterior longitudinal ligament is linked to heterotopic ossification of the ankle/foot tendons
2024
Overview
IntroductionSystemic osteogenesis has been speculated to be involved in the pathogenesis of ossification of the posterior longitudinal ligament (OPLL). Our purpose was to compare the radiologic prevalence and severity of heterotopic ossification in foot tendons of Japanese patients with OPLL and to determine their association with systemic heterotopic ossification.Materials and methodsClinical and radiographic data of 114 patients with OPLL were collected from 2020 to 2022. Control data were extracted from a medical database of 362 patients with ankle radiographs. Achilles and plantar tendon ossification were classified as grades 0–4, and the presence of osteophytes at five sites in the foot/ankle joint was assessed by radiography. Factors associated with the presence and severity of each ossification were evaluated by multivariable logistic regression and linear regression analysis.ResultsThe prevalence of Achilles and plantar tendon ossification (grade ≥ 2) was 4.0–5.5 times higher in patients with OPLL (40–56%) than in the controls (10–11%). The presence of Achilles tendon ossification was associated with OPLL, age, and coexisting plantar tendon ossification, and was most strongly associated with OPLL (standardized regression coefficient, 0.79; 95% confidence interval, 1.34–2.38). The severity of Achilles and plantar tendon ossification was associated with the severity of ossification of the entire spinal ligament.ConclusionsThe strong association of foot tendon ossification with OPLL suggests that patients with OPLL have a systemic osteogenesis background. These findings will provide a basis for exploring new treatment strategies for OPLL, including control of metabolic abnormalities.
