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.
Generally speaking, legal fees are tax deductible when the fees are incurred for the purpose of gaining or producing income from a business or property and are not outlays of a capital nature e.g. associated with the sale of capital property such as a sale of a building or shares in a corporation.