Heat is information
Inflamed tissue is warmer tissue. Increased local blood flow — the core of the inflammatory response — raises skin temperature over the affected area in measurable, mappable ways. Infrared thermography photographs that heat: a completely contact-free, radiation-free image of your body's physiological activity (Ring and Ammer, 2012).
Where an MRI shows structure and a biomechanical analysis shows movement, thermography shows something neither can: what your physiology is doing right now.
The asymmetry principle
The human body is thermally symmetrical to a remarkable degree — left and right sides normally differ by less than ~0.3°C (Fernández-Cuevas et al., 2015). That symmetry is the diagnostic key: a regional difference beyond normal limits flags something worth investigating — inflammation, overload, or altered blood flow.
This matters because tissue can be in trouble before it hurts. Overload builds silently: a tendon working beyond capacity shows thermal changes while it still feels fine. Côrte et al. (2019) piloted thermography as a screening tool in professional football precisely for this reason — catching muscle overload before it becomes muscle injury.
How we use it in practice
1. Baseline mapping at assessment
Every integrated assessment includes a thermal map. It regularly reveals surprises: the painful spot is often not the hottest spot. Pain at the knee with heat concentrated at the distal quadriceps tells a different story than heat in the joint line — and changes the treatment plan.
2. Locating the real target for treatment
MLS laser and other modalities work best aimed at the actual inflamed tissue. Thermography turns "treat where it hurts" into "treat where the physiology says".
3. Objective progress tracking
As tissue heals, its thermal signature normalises. Comparing maps across weeks gives us — and you — objective evidence of resolution, independent of how the area feels on a given day. It also flags when load has been increased too fast, before symptoms do.
4. Return-to-sport screening
Before clearing an athlete, a symmetrical thermal map adds one more layer of confidence that the tissue has genuinely settled — not just gone quiet.
Honest limitations
Thermography measures skin temperature — an indirect window into deeper physiology, influenced by circulation, ambient conditions and measurement protocol (Hildebrandt et al., 2010). It is a screening and monitoring tool, not a standalone diagnosis. We use standardised acclimatisation protocols and always interpret thermal findings alongside movement analysis, strength testing and clinical examination. Any clinic presenting thermography as a magic diagnostic camera is overselling it.
The bigger picture
Thermography is one layer of our assessment stack — structure (when imaging exists), movement (video analysis), foundation (foot scan), physiology (thermography) and system readiness (HRV). Each layer answers a question the others can't. Together, they replace guesswork with a map.
Curious what your thermal map shows? It's included in our full biomechanical assessment at Bruno Physical Rehabilitation, Ipswich.
References
- Ring, E.F.J. and Ammer, K. (2012) 'Infrared thermal imaging in medicine', Physiological Measurement, 33(3), pp. R33–R46.
- Hildebrandt, C., Raschner, C. and Ammer, K. (2010) 'An overview of recent application of medical infrared thermography in sports medicine in Austria', Sensors, 10(5), pp. 4700–4715.
- Côrte, A.C., Pedrinelli, A., Marttos, A. et al. (2019) 'Infrared thermography study as a complementary method of screening and prevention of muscle injuries: pilot study', BMJ Open Sport & Exercise Medicine, 5(1), e000431.
- Fernández-Cuevas, I., Bouzas Marins, J.C., Arnáiz Lastras, J. et al. (2015) 'Classification of factors influencing the use of infrared thermography in humans: a review', Infrared Physics & Technology, 71, pp. 28–55.
- Sillero-Quintana, M., Fernández-Jaén, T., Fernández-Cuevas, I. et al. (2015) 'Infrared thermography as a support tool for screening and early diagnosis in emergencies', Journal of Medical Imaging and Health Informatics, 5(6), pp. 1223–1228.