Earn Certificates of Achievement as you test your skills with NAILPRO’s Professional Participation Program. In each issue, you’ll find a multiple- choice test that will allow you to demonstrate what you’ve learned from our Nail Clinic column. For answers to this Test Yourself, read up on Nail Clinic: Knee Pain. If you earn a score of 80% or higher, you’ll be awarded a framable Certificate of Achievement. A perfect score earns a Certificate of Achievement With Honors.