Nonunion of tibial stress fractures in patients with deformed arthritic knees - Treatment using modular total knee arthroplasty

In two years we treated four women with ununited stress fractures of their proximal tibial diaphyses, They all had arthritis and valgus deformity The stress fractures had been treated elsewhere by non-operative means in three patients and by open reduction and internal fixation in one, but had faile d to unite. After treatment with a modular total knee prosthesis with a lon g tibial stem extension, all the fractures united. A modular total knee prosthesis is suitable for the rare and difficult prob lem of ununited tibial stress fractures in patients with deformed arthritic knees since it corrects the deformity and the adverse biomechanics at the fracture site, stabilises the fracture and treats the arthritis.