for a "HOT TOPIC" there certainly isn't much of a response.
at 4-5 months old, this isn't too surprising. get your tort under a good UVb source (not a cheap pet store bulb, but a good mercury vapor lamp such as mega-ray). if you live where it's warm, get it into the sun. make sure you're giving your tort plenty of greens rich in calcium (turnip, parsley, dandelion, etc.), mix in some ground up grasses (timothy, orchard, etc.). you can also use a calcium preparation, pick one with extremely low phosphorus (e.g. Miner-All). however, a good diet should take care of your tortoises calcium needs, but it must be a highly varied diet.
good luck,
matt