PAIN SYNDROME IN PATIENT AFTER HIP REPLACEMENT WITH A DUAL-MODULAR FEMORAL COMPONENT (CASE REPORT)

Total hip replacements with dual-modular femoral components (stem-neck interface) allow optimization of hip joint biomechanics via selective restoration of femoral anteversion, offset, and limb length theoretically improving muscle function and stability. Potential disadvantages are the additional stem-neck interface and the possible generation of metal ions and debris by fretting and crevice corrosion. The authors reported a case of patient with dual-modular stem presenting with pain and decreased function. Early-onset adverse inflammatory tissue reactions developed as a result of corrosion at the stem-neck interface of a dual-modular implant, requiring subsequent revision of well-fixed components with an extended trochanteric osteotomy. Additional examinations excluded infection. We consider that patients with a modular stem and neck junction and presenting with pain should be suspected on corrosion at the stem-neck interface and adverse inflammatory tissue reaction after infection exclusion.