I am unaware of data suggesting the efficacy of physical therapy improving sexual dysfunction.
Other than Viagra, there are other options. This can include Levitra - which some studies suggest an improved response. You may also want to consider intrapenile injection therapy with alprostadil (prostaglandin E1, Caverject), papaverine, or alprostadil with papaverine and phentolamine (Tri-Mix), which has had varying success.
Another option would be vacuum-assisted devices, such as the pump, as well as penile prosthetic devices. All these options can be suggested with your urologist.
If the erectile dysfunction is attributed to the spondylosis, then a neurology referral may be helpful.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.