Abstract:Early detection of clinically significant spinal cord retethering is of paramount importance for the preservation of neurologic function in patients with repaired spinal dysraphic lesions. We retrospectively analyzed 90 children who were followed with serial peroneal somatosensory evoked potentials (SEPs) after a repair of their spinal dysraphic lesions with the objective of evaluating whether SEPs were a useful way of monitoring these children to facilitate early detection of clinically significant retetherin… Show more
“…no surrounding cerebrospinal fluid signal) serves to support the clinical impression, whereas the absence of such imaging findings helps to refute a diagnosis of recurrent tethering. Somatosensory-evoked potential testing [14] and ultrasonography to evaluate cord movement [9] may also help to confirm the clinical diagnosis, but should not be an indication for reoperation in the absence of appropriate symptoms and signs. Thus, until more definitive diagnostic techniques become available, retethering remains primarily a clinical diagnosis [7,10,13].…”
The authors reviewed the records of 94 patients who underwent initial repair of a lipomyelomeningocele between 1982 and July 1996 at the Children’s Hospital of Pittsburgh to determine the incidence and time course of symptomatic retethering. In each of these patients, the initial operative goals were to microsurgically debulk as much of the lipoma as possible to allow the conus to move freely within the spinal canal, to divide any tethering arachnoidal adhesions, to close the pia if possible and to reconstitute a capacious thecal sac, using a dural graft if necessary. With a median follow-up of 58 months, 19 of these patients (20.2%) required 28 subsequent operations for symptomatic retethering. Median time between the initial procedure and reoperation for retethering was 52 months. The primary complaint of 12 patients was intractable low-back or leg pain. Other common symptoms were progressive bowel and/or bladder dysfunction, deterioration of motor function and foot deformities. The decision to reoperate was based predominantly on the clinical situation of the patient; magnetic resonance imaging was used to confirm the location and extent of tethering. Patients with transitional lipomas had a significantly higher frequency of symptomatic retethering than those with caudal or dorsal lesions (p < 0.05). No other clinical or technical feature correlated with an increased frequency of retethering. In particular, none of a variety of types of dural graft materials appeared to entirely prevent symptomatic retethering. Following reoperation, pain complaints resolved and many of the other symptoms improved partially or resolved completely. Although the long-term results were also favorable in the majority of patients, a small subgroup (n = 6) exhibited repetitive symptomatic tethering that proved increasingly difficult to treat. We concluded that symptomatic retethering is a common problem in children with lipomyelomeningoceles, even after an adequate initial operation. To date, no type of graft material has been shown to entirely prevent this problem. Close long-term surveillance of such patients is required to allow detection and treatment of symptomatic retethering.
“…no surrounding cerebrospinal fluid signal) serves to support the clinical impression, whereas the absence of such imaging findings helps to refute a diagnosis of recurrent tethering. Somatosensory-evoked potential testing [14] and ultrasonography to evaluate cord movement [9] may also help to confirm the clinical diagnosis, but should not be an indication for reoperation in the absence of appropriate symptoms and signs. Thus, until more definitive diagnostic techniques become available, retethering remains primarily a clinical diagnosis [7,10,13].…”
The authors reviewed the records of 94 patients who underwent initial repair of a lipomyelomeningocele between 1982 and July 1996 at the Children’s Hospital of Pittsburgh to determine the incidence and time course of symptomatic retethering. In each of these patients, the initial operative goals were to microsurgically debulk as much of the lipoma as possible to allow the conus to move freely within the spinal canal, to divide any tethering arachnoidal adhesions, to close the pia if possible and to reconstitute a capacious thecal sac, using a dural graft if necessary. With a median follow-up of 58 months, 19 of these patients (20.2%) required 28 subsequent operations for symptomatic retethering. Median time between the initial procedure and reoperation for retethering was 52 months. The primary complaint of 12 patients was intractable low-back or leg pain. Other common symptoms were progressive bowel and/or bladder dysfunction, deterioration of motor function and foot deformities. The decision to reoperate was based predominantly on the clinical situation of the patient; magnetic resonance imaging was used to confirm the location and extent of tethering. Patients with transitional lipomas had a significantly higher frequency of symptomatic retethering than those with caudal or dorsal lesions (p < 0.05). No other clinical or technical feature correlated with an increased frequency of retethering. In particular, none of a variety of types of dural graft materials appeared to entirely prevent symptomatic retethering. Following reoperation, pain complaints resolved and many of the other symptoms improved partially or resolved completely. Although the long-term results were also favorable in the majority of patients, a small subgroup (n = 6) exhibited repetitive symptomatic tethering that proved increasingly difficult to treat. We concluded that symptomatic retethering is a common problem in children with lipomyelomeningoceles, even after an adequate initial operation. To date, no type of graft material has been shown to entirely prevent this problem. Close long-term surveillance of such patients is required to allow detection and treatment of symptomatic retethering.
“…73 In patients with repaired spinal dysgraphic lesions, serial SEP studies have sometimes been used to facilitate early detection of clinically significant retethering, but the findings do not correlate well with clinical status and are of questionable utility. 71 An upper cervical myelopathy occurs in achondroplasia due to a small foramen magnum, and may lead to abnormal median or peroneal SEPs. 84 In one study, SEPs were abnormal in all patients with neurologic symptoms or signs and in 44% of patients without neurologic dysfunction.…”
“…Repeated cystometrograms can provide objective evidence of urological changes such as pressure, leak point, and dyssynergy of bladder function. Electromyography and somatosensory evoked potentials have been used experimentally to help diagnose tethered cord syndrome [Boor et al, 1993;Li et al, 1996]. However, their worth in clinical situations is still uncertain.…”
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