thanks for the query,
it is an interesting question.
is a field of medical science which assesses, examines, diagnoses and treats a patient with physical modalities like heat therapy, cold therapy, electrotherapy, exercise therapy
, hydrotherapy, manual therapy or mobilizations and various forms of specialized exercises based on scientific and proven concepts.
physical medicine - is sometimes and in some parts of the world is used as a synonym to physical therapy. But majorly it is used in context with the rehabilitation of the patients. rehabilitation means bringing back a patient into his/her normal life in which he/she was prior to illness. and most commonly it is required in conditions like head injury, spinal cord injury
, stroke, knee replacement
and hip replacement
surgeries, in all of these the patients faces physical as well as systemic problems to perform his/her daily activities so physical medicine more appropriate called as physical medicine and rehabilitation will help the patient.
and In this not only a physical therapist but an occupational therapist, speech therapist, orthotist, prosthetist etc will play an important role.
i hope this helps
feel free to ask further queries