[Hypophosphatemic diabetes and knee pain: does treatment with total knee arthroplasty promise success?].

Hypophosphatemic diabetes, a rare metabolic disease, presents in children, young adults as well as in elderly patients. In this report we describe the case of a 43-year-old woman with known hypophosphatemic diabetes who complained of severe knee pain after several osteotomies of the lower extremities. The patient was treated with bilateral total knee arthroplasty. The immediate post-operative outcome was good but showed deterioration at 12-month follow-up with decreased range of motion due to ligament stiffness. Knee arthroplasty in patients with hypophosphatemic diabetes remains a challenge for the orthopaedic surgeon. Arthroplasty can be recommended in severe knee pain; however, pre-operative interventions should be considered to prevent post-operative complications.