This method is being used for extremities. I don't know for the skull. Maybe these articles will help you:
Infrared Thermal Imaging in the Diagnosis of Musculoskeletal Injuries: A Systematic Review and Meta-Analysis. Sanchis-Sánchez E et all. AJR:203, October 2014
Infrared thermography is useful for ruling out fractures in paediatric emergencies.
Sanchis-Sánchez E et all. Eur J Pediatr. 2015 Apr;174(4):493-9.
In order to eliminate radiation exposure for children, some studies were conducted to evaluate thermography method. According to reported results, it is useful for fractures of extremities.
On the other hand, If you check the literature no standardization protocol of this method has been approved. Because some studies just check the hot spots on the view and presume hot spots as fractures. Some studies use local temperature levels. As a result, it was found to be available in the extremity bones. But some authors find this method useless for emergency conditions.
Thermography is a method of functional diagnostics, and for topical diagnosis has limitations. So no need to compete with the methods of structural imaging such as CT or MRI. At the same time, practical applications might be for thermography, for example, to adjust the rate of distraction, during monitoring of engraftment or to assess the effectiveness of physical therapy, especially in the area of sport medicine.
See, for example, 1) Morasievicz L. et al. (2008). Use of thermography to monitor the bone regenerate during limb lengthening, 2) RU patent 2457777 (URL: http://www.freepatent.ru/patents/2457777).
And the most efficient to apply thermography for the assessment of peripheral nerves damage, which often related to fractures of long tubular bones. There is an extensive literature about this application of the method.