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Table 2 Biopsy yield, quality, safety, and acceptance of biopsy procedure for gluteus medius myofascial trigger point (GTP) and descending trapezius myofascial trigger point (TTP) samples and control (vastus lateralis) samples

From: Evaluation of mitochondrial function in chronic myofascial trigger points - a prospective cohort pilot study using high-resolution respirometry

  GTP (n = 10) TTP (n = 10) Vastus Lateralis (n = 20)
Mean biopsy yield (mg) 3.7 ± 1.6 3.4 ± 2.2 3.8 ± 2.1
Mean microscopic biopsy quality (1–5)a 4.9 ± 0.32 4.7 ± 0.48 4.7 ± 0.47
Clinical wound assessment (number of patients without signs for local infection and inflammation), n 10 10 20
Mean ultrasonic volume of hematoma (cm3) 0 0 0
Surgical complications, n 0 0 0
Mean pain (NRS) at biopsy location after 7 days 0.25 ± 0.35 1.1 ± 2.3 0.2 ± 0.4
Procedure burden at biopsy location (1–4)b 3.2 ± 0.8 3.1 ± 0.99 3.1 ± 0.91
  1. Values are mean ± SD
  2. aMicroscopic biopsy quality scale of 1–5: 1 = poor, 2 = fair, 3 = good, 4 = very good, and 5 = excellent
  3. bProcedure burden scale of 1–4: 1 = very high, 2 = high, 3 = low, and 4 = none
  4. NRS Numeric Rating Scale