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Clinical Orthopaedics and Related Research®

, Volume 472, Issue 12, pp 3835–3841 | Cite as

Botulinum Toxin A Does Not Decrease Calf Pain or Improve ROM During Limb Lengthening: A Randomized Trial

  • Dong Hoon LeeEmail author
  • Keun Jung Ryu
  • Dong Eun Shin
  • Hyun Woo Kim
Symposium: 2013 Limb Lengthening and Reconstruction Society

Abstract

Background

During lower limb lengthening, distraction-induced muscle pain and surrounding joint contractures are frustrating complications for which few effective treatments are available.

Questions/purposes

We evaluated Botulinum Toxin Type A (BtX-A) injection in the calf muscles during human tibial distraction osteogenesis. We hypothesized that it may decrease calf pain and increase ROM of the surrounding joints by reducing muscle stiffness.

Methods

Between April 2010 and January 2011, we evaluated 36 patients undergoing bilateral tibia lengthening who met prespecified inclusion criteria. All patients underwent stature lengthening with lengthening over a nail or lengthening and then nailing. BtX-A (200 IU) was injected at the calf muscle only in one leg for each patient and the same amount of sterile normal saline was injected into the other leg as a control. Selection of the leg receiving the toxin was randomized. Clinical evaluation included a VAS score for calf pain and measurement of ROM of the knees and ankles and calf circumference, with evaluations performed in a double-blinded manner. Side-to-side differences were analyzed until the end of consolidation phase. Minimum followup was 24 months (mean, 30 months; range, 24–39 months). The distraction rate and the final length gain were similar in the treated and control limbs. A priori power analysis suggested that 34 legs were required to achieve statistical significance of 0.05 with 80% of power to detect a 50% difference in treatment effect between treatment and control groups.

Results

There were no differences in calf pain, knee and ankle ROM, and maximal calf circumferences between the two legs at each time point.

Conclusions

Local injection of 200 IU BtX-A at the human calf muscle does not appear to reduce calf pain or help enhance ROM of the knee and ankle during tibial lengthening. However, the small sample size provided sufficient power to detect only relatively large clinical effects; future, larger trials will be needed to determine whether smaller differences are present.

Level of Evidence

Level II, therapeutic study. See Instructions for Authors for a complete description of levels of evidence.

Keywords

Tibialis Anterior Muscle Distraction Osteogenesis Calf Muscle Sterile Normal Saline Tramadol Hydrochloride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors thank Dr. Dror Paley for his insights in using BtX-A in human lower limb lengthening, Jung Ho Park, our physical therapist, for his enthusiastic and cooperative work for all our patients, and Dr. Bang Hyun Kim for his effort in clinical assessment.

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Copyright information

© The Association of Bone and Joint Surgeons® 2014

Authors and Affiliations

  • Dong Hoon Lee
    • 1
    Email author
  • Keun Jung Ryu
    • 2
  • Dong Eun Shin
    • 2
  • Hyun Woo Kim
    • 1
  1. 1.Department of Orthopaedic Surgery, Severance Hospital, College of MedicineYonsei UniversitySeoulRepublic of Korea
  2. 2.Department of Orthopaedic SurgeryCHA Bundang Medical CenterSung-namRepublic of Korea

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