You've finally had to throw out those cross-trainers. They've been your companions through miles of workouts and it breaks your heart to have to dump them. It's been so long since you've had to purchase a new pair, you don't know where to begin. Here's a short guide to help you decide which pair to buy next.

When shopping for athletic shoes, you should already know what sport you will be using them for. Will you be using them to train for a marathon, or will you wearing them to basketball practice? Running shoes are designed differently than, say, tennis or cross-training shoes, and choosing the right shoe can help your performance and help you to avoid injuries.

Athletic shoes fall into different categories. For example, there are sneakers which are appropriate for running on a track or road, and they are those models which are designed to give you traction when trail running. Likewise, tennis shoes are designed to allow the wearer to get the best traction while running and making those quick turns on the court. Baseball and soccer shoes, or 'cleats,' are usually spiked to let you run in soft grass and mud.

Once you've decided on which type of shoes you want to buy, it's time for you to try them on. It is important to try on the shoes, at the end of the day, when your feet are their largest. It may sound strange, but your feet swell during the course of the day, so if you want to get the best fit, you should try them on towards the end of the day. It is also very important to remember to bring the type of socks that you will be wearing with them, to guarantee a proper fit. When you have them on, walk around. This will give you a better idea as to whether they really will be comfortable or not. And remember, the shoe should not slip or slide on your foot when you are wearing them.

Purchasing your next pair of sports shoes should be fun and with a little bit of planning, they should last for a long time.

Jeff Lakie is the founder of Plastic Surgery Resources a website providing information on cosmetic surgery

While not commonly asked, one of the first questions a potential breast augmentation should ask is...does the breast implant interfere with being able to detect breast cancer? Since breast cancer in the United States affects one in 11 women during their lifetime, this is a fairly important question. As breast augmentation procedures continue to be on the rise, this important question should be thoroughly addressed.

In a recently published analysis of this topic by Dr. Neal Handel of Santa Barbara, California in the December 2007 Supplement issue of Plastic and Reconstructive Surgery, he does exactly that. Using over 4,000 patients over a 23 year period, he assessed how easily mammography detected breast lesions. Women with breast implants presented more frequently with breast masses, invasive tumors, and axillary node spread. However, there was no significant difference in stage of disease, tumor size, recurrence, or survival between the two groups. Despite the diminished sensitivity of mammograms to detect breast cancer in women with implants, nonaugmented women and augmented women are diagnosed at similar stages of disease and have similar prognoses. In women with breast implants, the use of conservation therapy (which almost always involves radiation) in breast cancer treatment resulted in a high rate of implant contarctures and poor cosmetic outcomes as a result.

In a companion study in the same Supplement, Dr. Dennis Deapen of Los Angeles, California evaluated literature over the past 20 years which examined breast cancer-related risks among breast implant patients. He found that women with breast implants do not experience delayed detection of breast cancer. He summarized that breast implants are not associated with an increased risk of breast cancer incidence or death and these patients do not experience delayed detection or poorer survival after breast cancer treatments.

These two published studies should go far to alleviate any concerns in potential and existing breast implant patients about the detection and treatment of breast cancer.

Dr Barry Eppley is a board-certified plastic surgeon in private practice in Indianapolis, Indiana at Clarian Health Systems. (http://www.eppleyplasticsurgery.com) He writes a daily blog on plastic surgery, spa therapies, and medical skin care at http://www.exploreplasticsurgery.com