Why Straight and Curved Platysma Morphologies May Produce Opposite Clinical Effects?

Area of Science:

• Aesthetic medicine
• Facial anatomy
• Neuromodulator treatments

Background:

• Lower-face and neck lifting with botulinum toxin A is often attributed solely to releasing the platysma's downward pull.
• The platysma muscle's complex, variable, and often asymmetric facial extension is not fully addressed by this explanation.
• Understanding platysma contraction patterns is crucial for predictable aesthetic outcomes.

Purpose of the Study:

• To propose that platysma muscle patterns significantly influence the success of neuromodulator-based lifting procedures.
• To highlight the limitations of the current depressor pull explanation for platysma treatments.
• To introduce a pattern-based classification and clinical algorithm for safer jawline lifting.

Main Methods:

• Clinical commentary based on anatomical rationale and observed patient outcomes.
• Dynamic examination of patients in upright position, at rest and during contraction.
• Documentation of skin motion, active band location, and dominant vector (vertical, mixed, curved).
• Consideration of ultrasound for enhanced assessment of muscle characteristics and relationships.

Main Results:

• Platysma patterns (straight/vertical-dominant vs. curved/posterior-dominant) dictate treatment response.
• Vertical-dominant patterns benefit from selective weakening of the depressor vector.
• Indiscriminate weakening of curved patterns can lead to adverse effects like anterior collapse or worsened fullness.

Conclusions:

• Platysma pattern recognition is essential for optimizing neuromodulator treatments for jawline contouring.
• A dynamic, pattern-based assessment should precede fixed injection grids.
• A proposed algorithm aims for safer and more predictable lower-face and neck lifting results.