TMJ Physiotherapy After Radiation Therapy: Why Rehabilitation Is Important
Radiation therapy can be an essential part of treatment for head and neck cancers. However, even after cancer treatment has been completed, some people experience changes in the muscles, connective tissues, jaw, neck, and swallowing structures that can affect everyday function.
One of these complications is trismus, or restricted mouth opening. Radiation therapy involving the head and neck can contribute to the development of scar tissue and fibrosis around the jaw muscles and temporomandibular joint (TMJ), making it increasingly difficult to open the mouth comfortably.
For patients experiencing jaw stiffness after radiation therapy, TMJ physiotherapy can be an important part of rehabilitation.
Why Can Radiation Therapy Affect the Jaw?
Radiation does not affect only the tumour being treated. Depending on the treatment area and radiation dose, surrounding tissues may also undergo changes during and after treatment.
Over time, radiation-related tissue changes can contribute to:
Fibrosis and stiffness of the jaw muscles
Reduced tissue flexibility
Restricted mouth opening
Neck stiffness and reduced cervical mobility
Jaw pain or tightness
Difficulty chewing
Changes in tongue and swallowing function
Difficulty maintaining normal oral hygiene or receiving dental treatment
These changes may develop gradually, which is why patients sometimes notice increasing jaw restriction weeks or months after completing radiation therapy.
What Is Trismus?
Trismus refers to difficulty opening the mouth normally.
Following head and neck cancer treatment, trismus may develop after radiation therapy, surgery, or a combination of treatments.
A person may notice that it is becoming harder to:
Open the mouth widely
Bite into food
Chew comfortably
Brush or floss the teeth
Receive dental treatment
Yawn
Speak comfortably
Perform normal oral and facial movements
Because radiation-related fibrosis can progress over time, persistent or worsening restriction should be discussed with the patient's oncology or healthcare team.
Why Is Early TMJ Rehabilitation Important?
The goal of rehabilitation is not simply to reduce jaw discomfort. Maintaining movement and function is particularly important after head and neck radiation.
Once significant stiffness and fibrosis develop, restoring movement may become more challenging. A rehabilitation program can therefore focus on maintaining available mobility, gradually improving restricted movement when appropriate, and teaching the patient strategies to continue working on mobility between appointments.
Consistency is important. A carefully prescribed home exercise program may form a significant part of treatment.
How Can TMJ Physiotherapy Help After Radiation Therapy?
Treatment should always be individualized according to the patient's cancer history, radiation treatment, surgical history, current tissue health, symptoms, and medical precautions.
Following appropriate medical clearance, a TMJ physiotherapy assessment may examine:
Jaw mobility:The physiotherapist can measure mouth opening and assess jaw movement, including opening, closing and side-to-side movement.
Masticatory muscle function:The masseter, temporalis and other muscles involved in jaw movement may be assessed for restriction, tenderness and altered function.
TMJ mobility:The movement of the temporomandibular joints can be assessed to determine whether joint restriction is contributing to reduced mouth opening.
Neck mobility and posture:Head and neck radiation can affect more than the jaw. Cervical stiffness and changes in surrounding soft tissues may influence overall head, neck and jaw function.
Tongue and oral function:Tongue mobility and the muscles around the floor of the mouth may also be relevant, particularly when the patient reports changes with chewing or swallowing.
Based on the assessment, treatment may include appropriate manual therapy, gentle mobility techniques, individualized jaw stretching and mobility exercises, cervical rehabilitation, postural strategies and a home exercise program.
Treatment should not be aggressive. Irradiated tissues require careful consideration, and techniques must be adapted to each person's medical history and tissue tolerance.
Jaw Rehabilitation and Swallowing Are Closely Connected
The jaw does not function independently.
Opening the mouth, chewing, controlling food and swallowing require coordination between the jaw, tongue, suprahyoid muscles, neck and throat structures.
Some people who have received radiation therapy for head and neck cancer experience both restricted jaw opening and swallowing difficulties.
In these situations, multidisciplinary care can be particularly valuable. A physiotherapist may address jaw and neck mobility, while a Speech-Language Pathologist (SLP) can assess swallowing and other oral-motor concerns when indicated.
When Should You Seek an Assessment?
Consider speaking with your healthcare team about rehabilitation if you notice:
Your mouth does not open as widely as it previously did
Jaw movement is becoming progressively restricted
Your jaw or facial muscles feel increasingly tight
Eating or chewing has become more difficult
Neck movement has decreased
Oral hygiene or dental treatment is becoming difficult because of limited opening
You experience changes in swallowing
Jaw stiffness is affecting daily activities or quality of life
You do not necessarily need to wait until the restriction becomes severe.
Early recognition of changes can allow your healthcare team to determine whether rehabilitation is appropriate and establish a plan for maintaining function.
TMJ Physiotherapy and Head & Neck Rehabilitation in Oakville
At Uniphysio & Associates in Oakville, our approach to TMJ and orofacial physiotherapy considers the relationship between the jaw, cervical spine, muscles of mastication, tongue, swallowing musculature, breathing and posture.
For patients who have completed radiation therapy for head and neck cancer, treatment is individualized according to their medical history, current presentation and recommendations or precautions from their oncology team.
When appropriate, care can also be coordinated with other healthcare professionals, including physicians, dentists and Speech-Language Pathologists.
If you have developed jaw stiffness, reduced mouth opening, TMJ symptoms or neck restriction following radiation therapy, speak with your healthcare team about whether TMJ physiotherapy may be appropriate for you.
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