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- W2980349211 abstract "Commentary Most pediatric orthopaedic surgeons would agree that Ponseti cast treatment is the standard of care for infants with idiopathic congenital clubfoot. The vast majority of infants respond to the gentle, sequential manipulation and cast changes advocated by Ignacio Ponseti and, in all but the most rigid feet, the cavus, adduction, and varus components of the deformity are corrected with relative ease. The equinus component of the deformity, however, can offer resistance to passive stretching. Frequently, little or no correction of the deformity occurs with further cast treatment; this is referred to as hindfoot stall, and up to 80% of feet may require tenotomy of the Achilles tendon at this point in order to achieve satisfactory ankle dorsiflexion1. The tenotomy may be performed in the clinic with the use of local anesthesia1 or in the operating room with either sedation or general anesthesia. Healing of the tenotomized Achilles tendon has been studied in some detail, and it has been demonstrated that the continuity of the tendon is restored within 4 weeks and the nearly normal structure is restored in 12 weeks2. Over the first few months after the tenotomy, there is an appreciable increase in the girth of the tendon, which gradually reduces by the end of the first year but some ultrasonographic evidence of residual thickening and mild irregularity of the internal structure of the tendon may persist3. Some reduction in ankle push-off power, when measured at 5 years of age, is seen in all treated clubfeet, with no difference between children who have had a tenotomy of the Achilles tendon and those who have not4. The deformity recurs in a proportion of children treated with the Ponseti method, and this may not become manifest until 3 years of age5. It is against this background that we need to consider the results of the present study. The primary objective of this double-blind, placebo-controlled study was to determine whether clinical outcomes differ depending on whether, at the time of hindfoot stall, infants received a botulinum toxin type-A (BTX-A) or placebo injection into the gastrocnemius-soleus muscle. The results show that there is virtually no difference in the frequency of responders (i.e., those who achieved adequate ankle dorsiflexion) between the BTX-A group and the placebo group. The study, however, did not end there but permitted a crossover of non-responders from the placebo group to have BTX-A injection, following which all of them achieved adequate ankle dorsiflexion. This makes the interpretation of the results confusing. The dose of BTX-A used in unilateral cases was 10 U/kg of body weight, but only half of the dose was injected into each calf in bilateral cases. This means that a dose of 5 U/kg may suffice, and I would question the need for injecting the higher dose in any infant. The frequency of relapses may be underestimated at 2 years (the duration of the study) since relapses may not be evident until the child is older. This possibility warrants a longer study period. An impressive result of the study was that 92% of the entire study population did not require a tenotomy of the Achilles tendon, which is contrary to most reports of the Ponseti method of treatment1. A closer look at the study shows that this was achieved by a higher number of casts and consequently more frequent visits to the hospital, a longer period in casts, and up to 3 BTX-A injections, arguably at a considerably higher cost than that of a percutaneous tenotomy performed with local anesthetic in the clinic. Cost considerations are particularly relevant in low-income countries, where clubfoot is exceedingly common. Given the data that suggest that a tenotomy of the Achilles tendon causes very little morbidity in the long term, are the concerted efforts to avoid a tenotomy practiced by the authors of the study necessary? The authors have not yet documented the long-term effects of single or multiple BTX-A injections into the calf in infancy and hence cannot state if the long-term effects of a tenotomy of the Achilles tendon are more deleterious than the effects of BTX-A injections. Until the authors can clearly demonstrate a favorable cost-benefit ratio of avoiding an Achilles tenotomy, many surgeons may be reluctant to adopt the protocol described in this interesting report." @default.
- W2980349211 created "2019-10-25" @default.
- W2980349211 creator A5023503742 @default.
- W2980349211 date "2018-09-19" @default.
- W2980349211 modified "2023-09-23" @default.
- W2980349211 title "Needle or Knife at Hindfoot Stall?" @default.
- W2980349211 cites W1991207348 @default.
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- W2980349211 doi "https://doi.org/10.2106/jbjs.18.00586" @default.
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