Clinical trial NCT06851494: Safety and Efficacy of Linnea Safe PMMA 30% Use for Gluteal Augmentation.
Official title: Safety and Efficacy of Linnea Safe PMMA 30% Use for Gluteal Augmentation.
Study type: INTERVENTIONAL
Overall status: NOT_YET_RECRUITING
Phase: NA
Conditions: Gluteal Augmentation
Keywords: buttock augmentation
Lead sponsor: LEBON PRODUTOS QUIMICOS E FARMACEUTICOS LTDA.
Sponsor class: INDUSTRY
First posted: 2025-02-28
Enrollment: 137
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: OTHER

Brief summary: This pre-market, interventional, single-arm study aims to evaluate the safety and efficacy of LinneaSafe 30% polymethylmethacrylate (PMMA) for gluteal augmentation. The study will include 119 patients, with a total recruitment of 137 to account for a 15% drop-out rate. Eligible participants are men and women over 18 years old who express interest and are deemed suitable for the procedure. The primary safety outcome is the incidence of adverse events, while the primary efficacy outcome is patient satisfaction.

Detailed description: This pre-market, interventional, single-arm study aims to evaluate the safety and efficacy of LinneaSafe 30% polymethylmethacrylate (PMMA) for gluteal augmentation. The study will include 119 patients, with a total recruitment of 137 to account for a 15% drop-out rate. Eligible participants are men and women over 18 years old who express interest and are deemed suitable for the procedure. The primary safety outcome is the incidence of adverse events, while the primary efficacy outcome is patient satisfaction.

Patient recruitment will be conducted via social media. After signing the consent form, participants will undergo screening, including laboratory tests, gluteal ultrasound, and bioimpedance. The procedure (T0) involves baseline photos, gluteal measurements, and intramuscular PMMA augmentation (maximum 300 mL), followed by an evaluation of patient and clinician satisfaction. Follow-ups include online assessments at T1 week and T3 months to monitor adverse events. At T6 months, patients will undergo clinical evaluation, laboratory tests, photos, and satisfaction assessments, with the possibility of a retouch (up to 120 mL) if necessary, followed by an additional online check-up after one week. The final evaluation at T12 months will include photos, gluteal measurements, laboratory tests, ultrasound, bioimpedance, and an overall assessment of safety and efficacy.

Eligibility criteria: Inclusion Criteria:

* Men and women;
* Older than 18 years;
* Signed Informed Consent Form;

Exclusion Criteria:

* Prior intramuscular filling with PMMA for volumization of the buttocks or other body areas (reported by the patient or verified on ultrasound).
* Clinical history or evidence on ultrasound of intramuscular injection of liquid/industrial silicone, hydrogels (except hyaluronic acid and absorbable biostimulators performed up to 6 months before), synthol, potenay, ADE vitamins or other products in the glutes
* Pregnant or breastfeeding women
* Presence of silicone prosthesis for gluteal augmentation;
* Levels of 25 hydroxy vitamin D \> 60 mg/mL;
* Vitamin D supplementation in the 3 months prior to the procedure - even with 25 hydroxy vitamin D levels between 15 and 60 mg/mL
* Altered PTH (less than 12pg/mL or greater than 65 pg/mL CRP greater than 1 mg/dL (or 10 mg/L)
* Erythrocyte sedimentation value 2 times higher than normal;
* Women with testosterone levels greater than 70 ng/dL
* Women with estrogen levels greater than 450 pg/mL
* Urea value greater than 50 mg/dL
* Creatinine value greater than 1.3 mg/dL
* Glomerular filtration rate less than 90 mL/min
* Rheumatoid factor value greater than 79 UI/mL
* Ionic calcium values greater than 5.2 mg/dL (or 1.30 mmol/L)
* Total calcium value greater than 10.5 mg/dL
* Iron value greater than 175 µg/dL
* Ferritin value greater than 336 ng/dL
* Calcitriol greater than 90.1pg/dL
* Uncontrolled diabetes (fasting blood glucose \> 100mg/dL)
* Antinuclear factor (ANA) \> 1:160;
* Personal history of more than one episode of pain due to kidney stones (except during pregnancy)
* Ratio of urinary calcium and urinary creatinine in an isolated urine sample \> 250.
* Patients using medications for cancer treatment
* Patients with lupus, systemic scleroderma, dermatomyositis, granulomatous diseases
* Any other contraindications mentioned in the product's instructions for use, such as: history of evolving autoimmune disease, during treatment with immunosuppressants, or in any disorder or active skin infection. The use is absolutely contraindicated in cases of active herpes lesions. In cases of herpetic history, prophylactic treatment is recommended. Any inflammatory reaction from injections is also a contraindication.

Primary outcomes:
measure: Adverse Events
timeFrame: From enrollment to the end of treatment at 12 months
Secondary outcomes:
measure: Patient Satisfaction
timeFrame: From enrollment to the end of treatment at 12 months
Other outcomes:
Locations:
Study officials:
name: Fernanda Bortolozo
role: PRINCIPAL_INVESTIGATOR
References:
citation: Lemperle G, Morhenn V, Charrier U. Human histology and persistence of various injectable filler substances for soft tissue augmentation. Aesthetic Plast Surg. 2003 Sep-Oct;27(5):354-66; discussion 367. doi: 10.1007/s00266-003-3022-1. Epub 2003 Dec 4.
citation: Chacur R, Sampaio Menezes H, Maria Bordin da Silva Chacur N, Dias Alves D, Cadore Mafaldo R, Dias Gomes L, Dos Santos Barreto G. Gluteal Augmentation with Polymethyl Methacrylate: A 10-year Cohort Study. Plast Reconstr Surg Glob Open. 2019 May 31;7(5):e2193. doi: 10.1097/GOX.0000000000002193. eCollection 2019 May.
citation: Serra MS, Goncalves LZ, Ramos-e-Silva M. Soft tissue augmentation with PMMA-microspheres for the treatment of HIV-associated buttock lipodystrophy. Int J STD AIDS. 2015 Mar;26(4):279-84. doi: 10.1177/0956462414536878. Epub 2014 May 22.
citation: Atiyeh B, Ghieh F, Oneisi A. Safety and Efficiency of Minimally Invasive Buttock Augmentation: A Review. Aesthetic Plast Surg. 2023 Feb;47(1):245-259. doi: 10.1007/s00266-022-03049-5. Epub 2022 Aug 23.
citation: Dai Y, Chen Y, Hu Y, Zhang L. Current Knowledge and Future Perspectives of Buttock Augmentation: A Bibliometric Analysis from 1999 to 2021. Aesthetic Plast Surg. 2023 Jun;47(3):1091-1103. doi: 10.1007/s00266-022-03140-x. Epub 2022 Oct 25.
citation: de Melo Carpaneda E, Carpaneda CA. Adverse results with PMMA fillers. Aesthetic Plast Surg. 2012 Aug;36(4):955-63. doi: 10.1007/s00266-012-9871-8. Epub 2012 Mar 22.
citation: Ridwan-Pramana A, Idema S, Te Slaa S, Verver F, Wolff J, Forouzanfar T, Peerdeman S. Polymethyl Methacrylate in Patient-Specific Implants: Description of a New Three-Dimension Technique. J Craniofac Surg. 2019 Mar/Apr;30(2):408-411. doi: 10.1097/SCS.0000000000005148.
citation: Carvalho Costa IM, Salaro CP, Costa MC. Polymethylmethacrylate facial implant: a successful personal experience in Brazil for more than 9 years. Dermatol Surg. 2009 Aug;35(8):1221-7. doi: 10.1111/j.1524-4725.2009.01216.x. Epub 2009 May 12.
citation: de la Guardia C, Virno A, Musumeci M, Bernardin A, Silberberg MB. Rheologic and Physicochemical Characteristics of Hyaluronic Acid Fillers: Overview and Relationship to Product Performance. Facial Plast Surg. 2022 Apr;38(2):116-123. doi: 10.1055/s-0041-1741560. Epub 2022 Feb 3.
citation: Clark DP, Hanke CW, Swanson NA. Dermal implants: safety of products injected for soft tissue augmentation. J Am Acad Dermatol. 1989 Nov;21(5 Pt 1):992-8. doi: 10.1016/s0190-9622(89)70288-7.
citation: Jordan DR. Soft-tissue fillers for wrinkles, folds and volume augmentation. Can J Ophthalmol. 2003 Jun;38(4):285-8. doi: 10.1016/s0008-4182(03)80093-5.
citation: Haneke E. Polymethyl methacrylate microspheres in collagen. Semin Cutan Med Surg. 2004 Dec;23(4):227-32. doi: 10.1016/j.sder.2004.08.002.
citation: Blanco Souza TA, Colome LM, Bender EA, Lemperle G. Brazilian Consensus Recommendation on the Use of Polymethylmethacrylate Filler in Facial and Corporal Aesthetics. Aesthetic Plast Surg. 2018 Oct;42(5):1244-1251. doi: 10.1007/s00266-018-1167-1. Epub 2018 Jun 5.