In the not so distant past, it was politically incorrect to think of women as anything but equal to men. Fortunately, we've begun to celebrate the differences.

John Gray helped blaze that trail with his landmark book "Men are from Mars, women are from Venus," which analyzed and explained the different ways men and women think, emote and interact. It became OK to think that we were not exactly the same.

In the world of medicine, we have, for many years, even since I was in medical school in the '70s, known that in matters of sickness and health, men and women clearly are different.

Certain diseases and conditions are, of course, more common in each of the sexes - and I am not just talking about those ailments specific to male or female body parts like breast cancer in women and prostate problems in men.

I'm talking about problems in areas of the body where there is not much obvious difference in the anatomy and physiology of the areas in question.

Men are more likely to get gout and have earlier problems with their heart. Women are more prone to gallbladder problems, and women who smoke are more susceptible to developing lung cancer than men who smoke.

Men and women are even different in how they react to illness, relate to physicians, and choose to seek (or not) treatment when certain health problems arise. Even research studies done with a predominance of male subjects may not apply to females - and vice versa.

Do you think that men and women are much different in terms of their frame (i.e. muscles, bones, joints and ligaments)? Are men's muscles stronger than women's? Who is more likely to get arthritis? How about knee ligament injuries? Should women have a different knee replacement design than men? Stay tuned to find out.