A contact injury, such as a direct blow to the medial side (inside of knee), or a noncontact injury, such as a hyperextension stress. It is also commonly associated with an ACL tear which occurs with a high level of force and sports injury.
These types of legal fees are deductible as a business-related expense. You can deduct legal expenses incurred in your attempts to produce or collect taxable income as well as legal fees you pay in connection with the determination, collection, or refund of any tax.
[1] As the IRS provides guidance in Publication 529, Legal Fees for production of income and job related legal fees is deductible while personal legal expenses, including legal expenses to prepare a Will are not deductible. [2].