All you want to know about crutches - forearm and underarm crutches:
How to Walk With One Crutch: 6 Steps (with Pictures) - wikiHow
Amazon.com: ELorgzem 1Pcs Forearm Crutches, Adjustable Crutches for Adults, Lightweight Crutches for Adults with Cuffs,Can Prevent Slipping, Suitable for Old People, Lame People (1 Piece Black) : Health & Household
The low down on using crutches - Physio Clinic Bristol
Soft Tissue Injury: Use of Elbow Crutches | Hull University Teaching Hospitals NHS Trust
Adult forearm crutches w/height adjust. full cuff
How to Walk With One Crutch: 6 Steps (with Pictures) - wikiHow
Mobility+Designed Crutch | More comfort and less pain with the M+D Crutch.
Amazon.com: Single Forearm Crutch for Adults, Folding Arm Crutch, Elbow Crutch with Ergonomic Handle, Aluminum, Lightweight, Retractable, 6-Prong Base (1 PCS) : Health & Household