This case report presents a 38-year-old male patient who developed a false aneurysm of the superficial femoral artery after minimally invasive plate internal fixation of a comminuted articular distal femoral fracture sustained in a motor vehicle accident. Two days after surgery, the patient developed pain, non-pulsatile swelling on the medial side of the knee and anemia. After about six weeks, diagnosis of false aneurysm of the superficial femoral artery was confirmed by duplex ultrasound and computed tomographic angiography. A percutaneous endovascular procedure was performed to treat the false aneurysm without evacuating the blood collection.

Objective. In pursuance of thoroughly understanding and facilitating the evaluation of the radiological changes in the preloaded bone by Compliant Pre-Stress osseointegration (Compress Biomet, Warsaw, Indiana) a new staging method was created depicting four stages. Methods. Two cohorts (10 and 17 patients resp., not-receiving and receiving chemotherapy) were compared in terms of progression of osseointegration. Based on the changes at the bone-metal interface seen on röntgenorgrams four stages were defined: stage 0: immediate postoperative status, no ingrowth, or noncalcified callus; stage 1: early mineralization, calcified callus; stage 2: mature mineralization; and stage 3: hypertrophy at the level of the pins. Results. There were no significant differences between the two cohorts. Group 2, which was significantly younger than group 1 (p < 0.001), presented a delayed initial rate of bone formation and reached stage 1 at 6 months instead of 3 months like group 1. The children from the group 2 demonstrated a visible rebound ingrowth. Conclusion. Despite the fact that the staging fails to demonstrate a statistical difference, it is rather simple and can be used for future studies.

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