Prevalence and clinical impact of stent fractures after femoropopliteal stenting.
OBJECTIVE
The aim of this study was to investigate the occurrence and the clinical impact of stent fractures after femoropopliteal stenting.


BACKGROUND
The development of femoral stent fractures has recently been described; however, there are no data about the frequency and the clinical relevance.


METHODS
A systematic X-ray screening for stent fractures was performed in 93 patients. In total, 121 legs treated by implantation of self-expanding nitinol stents were investigated after a mean follow-up time of 10.7 months. The mean length of the stented segment was 15.7 cm.


RESULTS
Overall, stent fractures were detected in 45 of 121 treated legs (37.2%). In a stent-based analysis, 64 of 261 stents (24.5%) showed fractures, which were classified as minor (single strut fracture) in 31 cases (48.4%), moderate (fracture of >1 strut) in 17 cases (26.6%), and severe (complete separation of stent segments) in 16 cases (25.0%). Fracture rates were 13.2% for stented length < or =8 cm, 42.4% for stented length >8 to 16 cm, and 52.0% for stented length >16 cm. In 21 cases (32.8%) there was a restenosis of >50% diameter reduction at the site of stent fracture. In 22 cases (34.4%) with stent fracture there was a total stent reocclusion. According to Kaplan-Meier estimates, the primary patency rate at 12 months was significantly lower for patients with stent fractures (41.1% vs. 84.3%, p < 0.0001).


CONCLUSIONS
There is a considerable risk of stent fractures after long segment femoral artery stenting, which is associated with a higher in-stent restenosis and reocclusion rate.
Scheinert
Dierk
D
Clinical and Interventional Angiology, Heart Center-University of Leipzig, Strümpellstrasse 39, 04289 Leipzig, Germany. dierk.scheinert@gmx.de
Scheinert
Susanne
S
Sax
Jacqueline
J
Piorkowski
Christopher
C
Bräunlich
Sven
S
Ulrich
Matthias
M
Biamino
Giancarlo
G
Schmidt
Andrej
A
D000497:Alloys; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D004868:Equipment Failure; D005263:Femoral Artery / Q000000981:diagnostic imaging* / Q000601:surgery; D005500:Follow-Up Studies; D006083:Graft Occlusion, Vascular / Q000000981:diagnostic imaging / Q000209:etiology*; D006801:Humans; D011150:Popliteal Artery / Q000000981:diagnostic imaging* / Q000601:surgery; D011859:Radiography; D012720:Severity of Illness Index; D015607:Stents / Q000009:adverse effects*; D014654:Vascular Patency
D000497:Alloys; C013616:nitinol