He is probably telling you that your CV boot has ripped, causing the grease to come out. Many times if you are not hearing a clicking noise when you're turning, you can just repack the joint and replace the boot.
Most likely your technician is giving you a price to replace the whole axle. Find out if you can just replace the boot. It should be a much cheaper price.
〉 Answered on Jan 22nd, 2008 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines