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In this case report we present a posterior tibialis tendon (PTT) rupture in a male patient with Osteogenesis Imperfecta (OI) in his mid-forties. The incidence of OI has been reported between 1/15000 to 1/20000. It is characterized by fragile bone structure and skeletal dysplasia. The clinical manifestations of OI can pose challenges when planning and performing surgical interventions for ailments like tendon ruptures. We present a case from initial diagnosis through surgery and nine month clinical follow-up. Despite a complex medical history involving OI and an anamnestic record of PTT insufficiency a year before the acute injury, this case indicates the potential for successful surgery and healing following PTT rupture in patients with OI even with delayed treatment. To our knowledge, no prior reports on treatment of PTT rupture in patients with OI have been published.

Keywords: Osteogenesis imperfecta; Posterior tibialis tendon; Tibialis posterior tendon; Tendon reinsertion; Calcaneal osteotomy