Case Report

Surgical Management of Intracanal Rib Head Dislocation in Neurofibromatosis Type 1 Dystrophic Kyphoscoliosis: Report of Two Cases and Literature Review

Table 1

Surgical management of intracanal rib head dislocation in neurofibromatosis type 1 dystrophic kyphoscoliosis.

AuthorAge (range)/sexDislocated ribs [ of ribs ( of patients)]Cord impingementOther lesions presentPreoperative neurologyOperation detailsRib heads resectionComplications after 1st operationNeurology recovery

Flood et al. 1986 [12] 13>2NoYes Knee and ankle clonusTwo-stage vertebral wedge resection with rib excision and fusion. Traction used perioperatively, PSFYesNRResidual clonus

Major and Huizenga 1988 [13]13f2NoNoTransient loss of sensation below the waist and inability to move LL after fall on rib humpTwo-stage ASF with RH resection followed by segmental instrumented PSFYesNRn/a
5f2NoNoNoAnterior interbody fusion with RH resection followed by segmental instrumented PSFYesNRn/a
11m1NoNoNoPosterior fusion with RH resectionYesNRn/a

Deguchi et al. 1995 [9]12f2YesNoWeakness of the LL, difficulty walking with eventual paraparesis, hypesthesia below waist, ankle clonus, and knee/ankle HR; gradualLaminectomy and proximal resection of the compression rib; two-stage combined ASF and instrumented PSF; dislocated RH was resectedYesNRYes

Dacher et al. 1995 [15]10f1NoNoBilateral ankle clonus and daytime micturitionTwo-stage SF with CD instrumentationNRNRYes

Kamath et al. 1995 [20]13m1NoYesNoIntraspinal RH resection with right T9/10 hemilaminectomy and instrumented PSFYesNRn/a

Khoshhal and Ellis 2000 [5]16m1YesYesNoIn situ noninstrumented PSF; revision: anterior decompression and RH resection 8 months postop due to residual neurologyNoProgressive LL weakness, spasticity, and being unable to walkResidual HR

Legrand et al. 2003 [21]13m1NRNRHyperreflexiaPSF & ASFNoNRNR
10f2NRNRNoNRYesNRn/a
16m1NRNRHypotonia PSF & ASFNoNRYes
41f2NRNRPyramidal tract syndromeHalo traction and RH resectionYesNRYes

Mukhtar et al. 2005 [7]10m1YesNoBack pain induced by movements; weakness and shock-like feeling in Rt LL on direct pressure of Rt side of torso; gradualPosterior partial rib resection with RH left in situ; 2nd op: posterior in situ fusion (T6–T11)NoDue to IOM changes the RH was left in situ and the rest of the Rib was excisedYes

Gkiokas et al. 2006 [8]13f1YesNoB/L Babinski, clonus, weakness in LL (foot drop), decreased sensation, HR, and daytime micturition; “painful rib hump” symptomsPosterior decompression and resection of the RH, PSFYesNoYes

Yalcin et al. 2008 [2] 14m2NoYesNo Posterior laminectomy and PSFYesNon/a
12f2ContactYesNoPosterior laminectomy and PSFNoNon/a
6m2NoNRNoAnterior 5 level annulotomy and resection of T10 and T11 ribs; RH left in situ; growing rod constructNoNon/a

Cappella et al. 2008 [3]14m1YesNRGradual weakness in lower limbsStaged posterior instrumented and anterior SF with casting; revision: posterior decompressionNoProgression of deformityYes

Ton et al. 2010 [4] 14m2NoYesBack pain, knee and ankle HR, and clonus and “painful rib hump” like symptomsT4 laminectomy and posterior fusion and instrumentationYesNRNR
11f1YesNoNoMultilevel discectomies, T9 laminectomy, RH resection, and PSF YesNRn/a
11m1NoNoNoT9 laminectomy, ASF, and PSF and 9th RH resectionYesNRn/a
9f1YesYesBack pain, R foot weakness, and B/L LL HR and clonusResection of neurofibroma and 6th RH, PSF, & ASFYesNRNR

Abdulian et al. 2011 [6]14m2YesNoNo1st op: posterior T5 hemilaminectomy and T5/6 facetectomy, 2nd op: posterior T6 hemilaminectomy and T6/7 facetectomy, 3rd op: anterior T4–T9 release, and 4th op: T2-L3 instrumented PSFYesThe 2nd op was because the next intracanal protruding rib was missedn/a

Krishnakumar and Renjitkumar 2012 [22]11f2NRNRNRPSFYesNRNR

Sun et al. 2013 [11]13, 4f/2mNRNRNRNoSPOs and posterior correction with PSFNoNon/a

Mao et al. 2015 [10]13 (8–33), 10f : 9m1 (), 2 (), 3 ()NRNRNoThe posterior correction could be alone or adjunct with perioperative traction and occasionally supplemented with SPO; the anterior stage could include anterior release or convex growth arrest or ASF. 13 posterior only and 6 anterior & posteriorNoNRn/a

This table shows all published studies in the English literature to date, which are reporting on the management of intracanal rib head dislocation in neurofibromatosis type 1 dystrophic curves; level of evidence (LoE) V, case series: (LoE) IV, PSF: posterior spinal fusion, RH: rib heads, and LL: lower limbs. Op: operation.