Tissue Imbalance in Facial Paralysis and Its Treatment

Soft tissue imbalance resulting from facial paralysis is a complex condition that is not limited to loss of facial muscle movement; it leads to noticeable asymmetry due to the displacement of the skin, fat tissue, and connective tissues into different positions under the influence of gravity. This condition brings about both functional and aesthetic issues, such as drooping at the corner of the mouth, reduced cheek volume, altered eyebrow position, and an inability to fully close the eyelid. One of the most debated topics in this context is whether the approach should be aesthetic surgery or functional surgery. If you’d like to learn more about this topic, feel free to check out our content. We wish you good health and enjoyable reading.

What Is Soft Tissue Imbalance Following Facial Paralysis?

Soft tissue imbalance following facial paralysis is a condition characterized by the loss of muscle tone due to damage to the facial nerve, which controls the facial muscles, resulting in sagging, asymmetry, and loss of movement on one side of the face. During this process, not only the muscles but also soft tissues such as the skin, fat tissue, and connective tissue are affected and shift downward due to the effects of gravity. Symptoms such as drooping at the corner of the mouth, deepening of the nasolabial fold, reduced cheek volume, and an inability to fully close the eyelid become apparent. Additionally, soft tissue imbalance manifests itself both statically (asymmetry observed when the face is at rest) and dynamically (mismatch occurring during facial expressions).

This condition not only creates an aesthetic problem but also negatively impacts fundamental functions such as speech, eating, eye protection, and facial expressions, significantly reducing the patient’s quality of life.

Causes of Soft Tissue Imbalance Following Facial Paralysis

Soft tissue imbalance and asymmetry observed during the recovery process following facial paralysis (facial palsy) are generally caused by improper nerve healing or changes in muscle structure. In this context, other causes of soft tissue imbalance following facial paralysis include:

• Synkinesis (Abnormal Nerve Connections): Synkinesis generally refers to the misconnection of damaged nerve fibers to the wrong muscles during the healing process. For example, when a person tries to smile, the involuntary narrowing of the eye leads to an uneven pulling of the tissues.
• Muscle Atrophy (Muscle Loss): This refers to the loss of volume and weakening of facial muscles that have not been stimulated for an extended period. This condition causes the affected side to appear flatter or sagging.
• Muscle Contractures (Permanent Shortening): This refers to certain muscles remaining constantly tense or contracted. This causes one side of the face to appear higher or tighter than the other, disrupting facial balance.
• Differences in Muscle Tone: When the resting tension (tone) of the muscles on the affected side is lower or excessively higher than that of the healthy side, it creates asymmetry even at rest.
• Overuse of the Healthy Side: Since the affected side cannot move, the person typically relies more heavily on the healthy side. This leads to hypertrophy (excessive growth) of the muscles on the healthy side and makes the facial imbalance more pronounced.
• Lymphatic Drainage and Edema Issues: When the pumping function of the facial muscles decreases, lymph fluid may accumulate on the affected side, creating differences in tissue thickness.
• Loss of Tissue Elasticity: In cases of long-term paralysis, sagging due to gravity may occur as the skin and subcutaneous tissues lose their elasticity.

Symptoms of Soft Tissue Imbalance Following Facial Paralysis

Soft tissue imbalance that develops during the recovery process following facial paralysis manifests itself through various physical symptoms that are noticeable not only during movement but also when the face is at rest. To examine these symptoms:

• The corner of the mouth on the affected side drooping downward, or the eyebrow resting in a lower position compared to the unaffected side.
• Involuntary contraction of an unrelated muscle while making a facial expression. For example, squinting while eating or the eyelid closing while whistling.
• The cheek or corner of the mouth on the affected side feeling constantly tight, pulled, or stiffer than normal.
• Due to weakness in the muscles controlling the nostrils, the nostril on the affected side collapses inward during breathing, resulting in an asymmetrical appearance.
• The eye on the affected side remaining more open than the other, or appearing narrower than normal due to muscle spasms.
• A sunken appearance in that area due to muscle atrophy (wasting), or chronic swelling/edema caused by impaired lymphatic drainage.
• Excessive pulling of the lip line toward the healthy side while speaking, or food accumulating inside the cheek on the paralyzed side while eating.
• Fading of the forehead lines on one side, or conversely, the nasolabial fold becoming deeper and more pronounced than normal due to muscle contractions.

Functional Approaches Focused on Soft Tissue Imbalance Following Facial Paralysis

Functional approaches focused on soft tissue imbalance following facial paralysis are treatment strategies primarily aimed at restoring lost muscle movement or compensating for existing functions as effectively as possible. These approaches primarily focus on preserving eye function (the ability to close the eyelid), improving oral functions (feeding, speech, and saliva control), and restoring basic facial expressions. In this way, nerve transfers can create new pathways from healthy nerves to the paralyzed area, while muscle transfers can restore active movement. Additionally, methods such as the temporalis muscle transfer allow for the adaptation of chewing muscles to perform facial expressions.

On the other hand, in more advanced cases, facial sling techniques provide support against gravity for soft tissues, resulting in a more balanced position of the mouth corners and cheek area. Furthermore, the placement of a gold weight in the eye, performed to protect the eye, helps the eyelid close, thereby preventing corneal damage.

In conclusion, all these functional approaches not only improve the aesthetic appearance but also form the foundation of treatment by enabling the patient to maintain daily living activities independently and comfortably.

Surgical Approaches Focused on Soft Tissue Imbalance Following Facial Paralysis

Surgical approaches focused on soft tissue imbalance following facial paralysis involve comprehensive interventions designed to restore both the functional and aesthetic integrity of the face. The primary goal of these surgeries is to anatomically reposition displaced and atonic soft tissues, restore facial symmetry, and, if possible, restore active muscle movement. In this context, nerve repairs and nerve transfers can restore nerve signals to the muscles, while free muscle transfer can restore dynamic movement to the paralyzed side of the face.

In more advanced cases, facial expressions are supported by repositioning regional muscles, such as through temporalis muscle transfer. In short, during the surgical planning process, a personalized approach is determined by considering the patient’s duration of paralysis, degree of muscle atrophy, and overall health; often, the most successful outcomes are achieved by combining multiple techniques.

Differences Between Aesthetic and Functional Surgery in Soft Tissue Imbalances Following Facial Paralysis

• Key Difference: While functional surgery focuses on “movement” (smiling, blinking), aesthetic surgery focuses on “appearance” (correcting sagging, achieving facial balance at rest).
• Methods Used: Functional procedures typically involve live tissue transfers, such as muscle and nerve grafts; aesthetic procedures, on the other hand, utilize form-correcting techniques such as facelifts, brow lifts, fillers, or thread lifts.
• Medical Necessity: Functional surgery is performed to address health needs, such as preserving eye health (preventing corneal drying) or resolving nutritional issues; aesthetic surgery, on the other hand, is chosen to enhance the patient’s psychosocial well-being and visual symmetry.
• Timing: Functional interventions must be performed before the muscles lose their vitality (within the first 1–2 years following nerve damage). Aesthetic interventions, however, can generally be performed at any time after the healing process is complete to correct asymmetries that have become permanent.
• Outcome Expectations: In functional surgery, success is measured by the “ability to make facial expressions”; in aesthetic surgery, success is measured by “achieving visual balance in the mirror.”

Aesthetic Approach or Functional Approach for Soft Tissue Imbalance Following Facial Paralysis?

The question of whether an aesthetic or functional approach should be preferred in cases of soft tissue imbalance following facial paralysis is, in fact, a matter that does not have a single correct answer and must be evaluated on a case-by-case basis. This is because functional approaches primarily aim to restore essential life functions such as eye protection, mouth closure, speech, and eating; whereas aesthetic approaches aim to correct facial symmetry, ensure more natural-looking facial expressions, and improve the patient’s psychosocial well-being. However, these two approaches are not alternatives but complementary; because aesthetic interventions performed without achieving functional recovery may be insufficient, while treatments focused solely on function may fail to meet the patient’s expectations regarding appearance. For this reason, when creating a treatment plan, the duration of the stroke, the degree of nerve damage, the patient’s age, expectations, and daily living needs are evaluated together.

Today, the most effective results are achieved through combined approaches where functional recovery is established first, followed by aesthetic refinements to give the face a more balanced and natural appearance; thus, a holistic improvement in both quality of life and self-confidence is targeted.

Combined (Multidisciplinary) Approach

In cases of soft tissue imbalance following facial paralysis, the combined (multidisciplinary) approach is the most comprehensive treatment model, designed to address the patient’s functional and aesthetic needs simultaneously and in a coordinated manner. In this approach, various disciplines—including plastic and reconstructive surgery, neurology, physical therapy and rehabilitation, ophthalmology, and speech therapy when necessary—work together to create a personalized treatment plan.

The process typically begins with a detailed analysis of the condition of the facial nerve and muscle function; following this, nerve repair or transfer, muscle transfers, and supportive surgeries are planned. At the same time, physical therapy interventions and neuromuscular re-education aim to reactivate the muscles. Thanks to this comprehensive approach, not only facial movements but also the naturalness of facial expressions, symmetry, and the patient’s quality of life are significantly improved; thus, the treatment process is managed not as a one-dimensional effort but as a multi-layered approach designed to yield more successful outcomes.