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Sixty per cent of men subjected to prostatectomy had unstable bladders. It was found that this was related to the presence of either an indwelling catheter or obstruction, but had little influence on the result of prostatectomy. The functional urethral pressure profile length did not correlate with the size of the prostate gland. Shortening of the prostatic plateau was always found, but the extent to which the plateau was reduced did not correlate with urine flow rates.
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Rao et al. (1979) studied this question.
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