Malunions are a well-recognized complication of pediatric supracondylar humeral fractures. Results of corrective osteotomies vary, and complication rates have been reported to be as high as 40%. Considering the high rate of complications for malunion correction, we investigated the feasibility of arthroscopy. We present a technique for arthroscopic supracondylar osteotomy and percutaneous pinning. There are many advantages of an arthroscopic approach to malunion correction, including extension-type deformity correction, safe access to the anterior humerus, and minimal dissection and scarring; any intracapsular contracture can be addressed as well.