Simultaneous implantation of aTOPS (transcutaneous osseointegrated prosthetic system) and THA (total hip arthroplasty) or staged approach. Patients with aTOPS who have coxarthrosis. Patients with an existing THA who have required above-knee amputation and need aTOPS. Patients with an existing TOPS who sustain amedial femoral neck fracture and are not stabilizable with osteosynthesis. Atypical anatomy, osteomyelitis, radiation or chemotherapy to the affected limb in the last 18months, peripheral occlusive arterial disease with critical ischemia, diabetes mellitus with polyneuropathy, local dermal or systemic infection, immunocompromised state or use of immunosuppressants, cognitive impairment or lack of compliance for the system, other significant physical impairments. Individualized preoperative planning based on CT data. Access similar to conventional THA for existing TOPS. Implantation of an artificial acetabulum with amatching inlay. Similar approach for medial femoral neck fractures without reconstructive options. For existing THA and prior above-knee amputation, removal of existing shaft and potentially neck component for modular prosthesis. Subsequent implantation of TOPS stem in conventional manner. Additional THA requires appropriate rehabilitation following endoprosthesis guidelines, tailored to the TOPS situation. For simultaneous implantation of TOPS and THA the patients' load-bearing capacity and mobilization depend on the duration of the implanted stem. Only 4patients have been treated at BGU Murnau making statistical analysis not feasible. Three of the 4patients experienced significant pain relief and improved mobility shortly after surgery. One patient remained as immobile postoperatively as preoperatively due to inability to achieve pain-free full weight-bearing.
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