EffectivenessofDryNeedlingofMyofascialTriggerPointsintheTricepsSuraeMuscles:SystematicReview

Myofascial trigger points (MTrPs) in the triceps surae muscles (calf muscles) can cause pain, reduced range of motion, muscle weakness, and altered movement patterns. The triceps surae muscles are essential for functional activities like walking, jumping, and balance. Dry needling (DN) is a treatment technique that involves inserting thin needles directly into trigger points to elicit local twitch responses and mechanically disrupt the trigger point without injecting medications. While previous studies have examined dry needling for various conditions, this is the first comprehensive analysis specifically focused on its effectiveness for triceps surae trigger points.

Researchers conducted a systematic review searching five major medical databases through February 2022. They included 12 studies involving 426 participants (both athletes and non-athletes over 18 years old) who had trigger points in their triceps surae muscles without other musculoskeletal conditions. All studies used the "fast-in fast-out" or pistoning dry needling technique, where needles are rapidly inserted and withdrawn to trigger local muscle twitches. The researchers evaluated outcomes including pain, range of motion, muscle strength, muscle stiffness, and functional performance measures like jump height and deep squat ability.

They assessed study quality using established rating scales and analyzed results qualitatively since the studies were too different to combine statistically.

The review found mixed results across different outcome measures. Muscle stiffness showed consistent improvements with dry needling, with three studies reporting significant reductions in muscle tension both at rest and during contraction. Functional performance also improved, particularly jump height (increased by 1.2 inches in one study) and deep squat performance. However, results for pain were inconsistent - some studies showed improvements while others found no difference or even increased pain immediately after treatment.

Range of motion showed no clear benefits, and muscle strength results were inconclusive. Interestingly, pressure pain thresholds (how much pressure causes pain) actually worsened in the dry needling groups, likely due to post-needling soreness, a common side effect.

This systematic review suggests that dry needling may be beneficial for reducing muscle stiffness and improving functional performance in people with triceps surae trigger points, but the evidence for pain relief is unclear. The improvement in muscle stiffness could be particularly important since tight calf muscles may increase injury risk and affect athletic performance. However, patients should expect some immediate soreness after treatment, which may temporarily increase pain sensitivity. The results should be interpreted cautiously due to differences in study protocols, small sample sizes, and focus on immediate rather than long-term effects.

More high-quality research with standardized protocols and longer follow-up periods is needed to establish clear clinical guidelines for using dry needling in this muscle group.