The primary focus of therapy at this time should be to facilitate motion and light functional use. Fluidotherapy is the correct answer because it allows an individual to move within the medium, further facilitating their motion and decreasing discomfort. Cryotherapy including cold compression and ice massage is usually the most effective in the first 24-48 hours following an injury. Ultrasound could be beneficial, but continuous ultrasound should be used with caution until the fracture is fully healed.
Wietlisbach, C. & Branham, B. (2014). Physical Agent Modalities and Biofeedback. In M.V. Radomski & C.A. T Latham (Eds.), Occupational Therapy for Physical Dysfunction (7th ed., pp 558-588). Philadelphia: Lippincott Williams & Wilkins.