PURPOSE OF THE STUDY: Evaluation of a group of patients with coxarthrosis who sustained fractures of the proximal femur and were treated by dynamic hip screw (DHS) osteosynthesis. MATERIAL AND METHODS: The group comprised 23 DHS osteosyntheses in 22 patients treated between the years 1997 and 2012. The indication to osteosynthesis in all 23 cases was a stable pertrochanteric fracture of the femur; all patients had grade III or grade IV coxarthrosis (assessed on the Kellgren & Lawrence scale) and their physical health was classified as ASA 3 or 4. Preventive antibiotic therapy was administered within 48 hours of surgery. The evaluated factors included operative time, blood loss, specific complications such as infection, osteosynthetic material fractiure or osteosynthesis failure, requirement of revision surgery, post-operative mobility and patient survival. The follow-up was 2 years. RESULTS: The operative time was 35 min to 85 min (average, 49 min); blood losses ranged from 50 ml to 450 ml (average, 189 ml). Of the 23 hips, infectious complication was found in one (4.3%) and osteosynthetic material fractiure also in one (4.3%). There was no necessity of revision surgery due to osteosynthesis failure, nor any conversion to total hip arthroplasty. Postoperative mobility (with use of walking aids or forearm crutches) was achieved in 17 (77.3%) patients. The average survival of the patients was 6.3 months, the range from 7 days to 3 years. DISCUSSION: DHS osteosynthesis is a reliable method for the treatment of proximal femoral fractures due to osteoporosis. These fractures in patients with coxarthosis are primarily indicated to total hip arthroplasty. However, this is questionable in polymorbid elderly patients in whom hip replacement carries high risk. In such patients DHS osteosynthesis is preferred as a less risky procedure. CONCLUSIONS: DHS osteosynthesis is indicated for stable pertrochanteric fractures of the femur in a limited number of patients with advanced coxarthrosis in whom total hip replacement would be associated with an undue risk. The majority of patients after surgery became mobile, but with short-term survival.