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Comparison of 26G and 30G Needles for Masseter Trigger Point Injections in Patients With Myofascial Pain Syndrome (MASS-NEEDLE)

3 november 2026 uppdaterad av: Ceylan Guzel, Medipol University

Comparison of Two Needle Gauges (26G and 30G) for Masseter Muscle Trigger Point Injection in Myofascial Pain Syndrome: A Randomized Split-Face Controlled Trial

This randomized split-face study aims to compare the effects of 26G and 30G needles used for masseter trigger point injections with lidocaine in patients with myofascial pain syndrome. Both needle sizes are routinely used in clinical practice. Pain reduction from baseline to day 14 will be compared between the two sides of the face. Secondary outcomes include pain reduction at day 7, procedural pain, injection-site tenderness at 48 hours, bruising, and patient preference. The split-face design allows both needle sizes to be evaluated in the same patient, minimizing individual differences.

Studieöversikt

Status

Har inte rekryterat ännu

Betingelser

Intervention / Behandling

Detaljerad beskrivning

Both 26G and 30G needles were routinely used for masseter trigger point injection in our clinic. Comparing these gauges under otherwise standardized conditions may help clarify whether needle selection affects short-term pain reduction, procedural pain, and patient preference. A randomized split-face design permits this comparison within the same patient, reducing the influence of differences between individuals.

The primary objective of this study was to compare the within-patient reduction in palpation-evoked masseter pain between sides treated with 26G and 30G needles from baseline to day 14 following lidocaine injection. Secondary objectives were to compare pain reduction at day 7, overall procedural pain, injection-site tenderness at 48 hours, ecchymosis, and patient preference.

Studietyp

Interventionell

Inskrivning (Beräknad)

40

Fas

  • Inte tillämpbar

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studiekontakt

Studieorter

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

18 år och äldre (Vuxen, Äldre vuxen)

Tar emot friska volontärer

Nej

Kön som är behöriga för studier

Allt

Beskrivning

Inclusion Criteria:

Adults aged 18-65 years.

Bilateral masseter myofascial pain persisting for at least 8 weeks.

Baseline palpation-evoked pain score of ≥6 on an 11-point Numerical Rating Scale (NRS) on each side.

Presence of at least one active myofascial trigger point within a palpable taut band in each masseter muscle, reproducing the patient's familiar pain.

Diagnosis established according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD).

No previous treatment for masseter myofascial pain.

Exclusion Criteria:

  • Concomitant temporomandibular joint arthralgia.

Known allergy to local anesthetics.

Pregnancy or lactation.

Active infection, open lesion, or malignancy at the injection site.

Bleeding diathesis or use of anticoagulant or antiplatelet medications.

Inability to cooperate with study procedures.

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Primärt syfte: Behandling
  • Tilldelning: Randomiserad
  • Interventionsmodell: Enskild gruppuppgift
  • Maskning: Dubbel

Vapen och interventioner

Deltagargrupp / Arm
Intervention / Behandling
Experimentell: Bilateral Masseter Trigger Point Injection 26 G

All participants received bilateral masseter trigger point injections in a single session. A 26-gauge (26G) needle was randomly assigned to one masseter muscle and a 30-gauge (30G) needle to the contralateral masseter muscle using a computer-generated randomization sequence. Each masseter received 0.3 mL of 2% lidocaine without vasoconstrictor using a standardized injection technique. The right masseter was injected first in all participants. Participants and the outcome assessor were blinded to needle-gauge allocation, whereas the injecting clinician was not blinded.
Enhet: 26G Needle

A 26-gauge (0.45 × 13 mm) needle was used for masseter trigger point injection. A total of 0.3 mL of 2% lidocaine without vasoconstrictor was administered using a standardized injection technique.
Experimentell: Bilateral Masseter Trigger Point Injection 30 G

All participants received bilateral masseter trigger point injections in a single session. A 26-gauge (26G) needle was randomly assigned to one masseter muscle and a 30-gauge (30G) needle to the contralateral masseter muscle using a computer-generated randomization sequence. Each masseter received 0.3 mL of 2% lidocaine without vasoconstrictor using a standardized injection technique. The right masseter was injected first in all participants. Participants and the outcome assessor were blinded to needle-gauge allocation, whereas the injecting clinician was not blinded.
Enhet: 30 Gauge Needle

A 30-gauge (0.45 × 13 mm) needle was used for masseter trigger point injection. A total of 0.3 mL of 2% lidocaine without vasoconstrictor was administered using a standardized injection technique.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Between-Needle Difference in Palpation-Evoked Masseter Pain Reduction From Baseline to Day 14
Tidsram: Baseline and Day 14 (14 days after injection)

Palpation-evoked masseter pain was assessed separately on each side using an 11-point Numerical Rating Scale (NRS), ranging from 0 (no pain) to 10 (worst possible pain). At baseline and day 14, pain was recorded at the most painful trigger point identified during each assessment. Pain reduction was calculated as baseline NRS minus day 14 NRS for each side. The primary outcome was the within-participant difference in pain reduction between the 30G and 26G needle interventions (30G minus 26G). Positive values indicated greater pain reduction with 30G.
Baseline and Day 14 (14 days after injection)

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Between-Needle Difference in Palpation-Evoked Masseter Pain Reduction at Day 7
Tidsram: Baseline and Day 7

Palpation-evoked masseter pain was assessed separately on each side using an 11-point Numerical Rating Scale (NRS), ranging from 0 (no pain) to 10 (worst possible pain). Pain reduction was calculated as baseline NRS minus day 7 NRS for each side. The within-participant difference in pain reduction between the 30G and 26G needle interventions was calculated as 30G minus 26G. Positive values indicated greater pain reduction with 30G.
Baseline and Day 7

Andra resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Overall Procedural Pain During Masseter Trigger Point Injection
Tidsram: Day 0 (within 60 seconds after each injection)

Overall procedural pain was assessed separately for the 26G and 30G needle interventions using an 11-point Numerical Rating Scale (NRS), ranging from 0 (no pain) to 10 (worst possible pain). Participants rated the entire injection procedure, including skin penetration, intramuscular needle manipulation, and lidocaine administration. Pain was recorded within 60 seconds after each injection. Within-participant pain scores were compared between needle gauges.
Day 0 (within 60 seconds after each injection)

Samarbetspartners och utredare

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Sponsor

Medipol University

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Beräknad)

20 november 2026

Primärt slutförande (Beräknad)

1 januari 2027

Avslutad studie (Beräknad)

1 februari 2027

Studieregistreringsdatum

Först inskickad

3 november 2026

Först inskickad som uppfyllde QC-kriterierna

3 november 2026

Första postat (Faktisk)

9 november 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

9 november 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

3 november 2026

Senast verifierad

1 november 2026

Mer information

Termer relaterade till denna studie

Nyckelord

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • E-10840098-50.04-5377

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