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Results:
The 3-year actuarial rate of impotence was 23% (34/147). An additional 43% (49/113) of potent patients were using a potency aid at last follow-up. Penile bulb V100 values ranged from 0-0.05 cc (median, 0 cc) with D5 values ranging from 12.5-97.9 Gy (median, 40.8 Gy). There was no correlation between penile bulb D5 or V100 and postimplant impotency on actuarial analysis. For the combined right and left neurovascular bundle structures, V100 values ranged from 0.3-5.1 cc (median, 1.8 cc), and V150 values ranged from 0-1.5 cc (median, 0.31). There was no association between neurovascular bundle V100 or V150 and postimplant impotency on actuarial analysis. Cox regression analysis revealed no correlation between postimplant impotency rates and age at implant, history of diabetes mellitus, degree of pretreatment potency, hormone use, left NVB V100, right NVB V100, or total NVB V100.
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