Forearm supination contractures can occur as a result of neurological derangement of the upper extremity. Primarily, this is observed in patients with neonatal brachial plexus birth palsy. The contractures develop slowly over time and become problematic in childhood as the patients begin requiring forearm pronation for activities of daily living including typing on a keyboard and writing. Although supination contracture is a well-described sequelae of neonatal brachial plexus birth palsy, there is a paucity of literature describing techniques and outcomes for reconstruction and restoration of forearm pronation. The initially described technique included release of the interosseous membrane for flexibility combined with rerouting of part of the biceps tendon to change its biomechanical pull from supination to pronation. More recently, bone and soft tissue procedures have been combined with various forearm osteotomies. We present a combined derotational radial osteotomy and biceps rerouting to realign the forearm in resting pronation and convert the biceps from a supinator to a pronator. This novel surgical technique has not been described as a solution for supination contracture to restore pronation and provide biomechanical advantage of the biceps insertion.