Accuracy of Manual Needle Placement for Gastrocnemius Muscle in Children With Cerebral Palsy Checked Against Ultrasonography

Abstract 

Yang EJ, Rha D, Yoo JK, Park ES. Accuracy of manual needle placement for gastrocnemius muscle in children with cerebral palsy checked against ultrasonography.

Objective

To investigate the accuracy of manual needle placement into gastrocnemius muscle (GCM) for botulinum toxin type A (BTX-A) injection in children with spastic cerebral palsy (CP).

Design

Prospective clinical study.

Setting

University-affiliated hospital.

Participants

A total of 272 injections in GCMs of 39 children with spastic CP who were scheduled to receive BTX-A injections in GCMs.

Intervention

Not applicable.

Main Outcome Measures

The accuracy of manual needle placement was checked against ultrasonography.

Results

The needle was accurately inserted into GCM muscles in 78.7% of cases. Accuracy was 92.6% into gastrocnemius medialis (GM) and 64.7% into gastrocnemuis lateralis (GL). Muscle thickness at the needle insertion site was significantly thinner in GL than GM. Accuracy of GL in the younger age group (<4y, 57.6%) was lower than in the older age group (≥4y, 78.1%). For GM, accuracy in both younger and older age groups was good (>90%).

Conclusions

Injection of the toxin into GCMs through the use of anatomic landmark was acceptable in GM, but not acceptable in GL, especially in young children.

Key Words: Botulinum toxins, Cerebral palsy, Gastrocnemius muscle, Rehabilitation

List of Abbreviations: BTX-A, botulinum toxin type A, CI, confidence interval, CP, cerebral palsy, EMG, electromyograph, GCM, gastrocnemius muscle, GL, gastrocnemius lateralis, GM, gastrocnemius medialis, OR, odds ratio