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Background  Given differences in buttock versus thigh cellulite, collagenase clostridium histolyticum‐aaes (CCH‐aaes) injection technique may impact treatment effects at these sites.    Aim  To evaluate efficacy and safety of 5 CCH‐aaes injection techniques.    Methods  A phase 2A, open‐label trial enrolled women with mild‐to‐severe cellulite (Clinician Reported Photonumeric Cellulite Severity Scale) on both buttocks or thighs. CCH‐aaes 0.84 mg was administered as 12 injections in each of two buttock or two thigh treatment areas (total dose, 1.68 mg) during three treatment sessions (Days 1, 22, 43). On Day 1, women were sequentially assigned to: Technique A = shallow injection/3 aliquots; Technique B = shallow injection/1 aliquot; Technique C = deep injection/1 aliquot; Technique D = deep and shallow injections/5 aliquots; or Technique E = shallow injection/4 aliquots. Change from baseline in Hexsel Cellulite Severity Scale (CSS) depression depth (range, 0 [no depressions] to 3 [deep depressions]) was assessed at Day 71. Safety was evaluated via adverse events.    Results  Sixty‐three women with buttock ( n  = 31) or thigh ( n  = 32) cellulite received ≥1 CCH‐aaes dose. For buttock cellulite, CCH‐aaes injection Technique A resulted in the greatest baseline‐adjusted improvement in CSS score on Day 71 (least‐squares mean, 1.17‐point improvement). For thigh cellulite, CSS score improvement was greatest with Technique D (least‐squares mean, 1.40‐point improvement). CCH injection Techniques A, D, and E were associated with more favorable safety profiles than Techniques B and C.    Conclusion  Different CCH‐aaes injection techniques are required with buttock (Technique A) versus thigh (Technique D) cellulite to optimize treatment outcomes.

Evaluation of five collagenase clostridium histolyticum‐aaes injection techniques for the treatment of cellulite on the buttock or thigh