Abstract:
INTRODUCTION:During tibial lengthening procedures, it is recommended to prevent fibular malleolus proximal migration using a distal tibiofibular syndesmotic screw, which is removed at 6 months. We have observed proximal migrations of the fibular malleolus despite placement of this syndesmotic screw. OBJECTIVE:The objective of this study was to demonstrate this migration and to study the influence of two factors that may favor its occurrence: positioning of the syndesmotic screw and union of the fibula at the time of removal. HYPOTHESIS:An unhealed fibula at the time the distal tibiofibular syndesmotic screw is removed and its tricortical position promote the proximal migration of the fibular malleolus. MATERIAL AND METHODS:This was a retrospective, single-center, analytical study that included 22 lengthening procedures in 18 patients from 5 to 17 years of age who had undergone tibial lengthening and presented a preoperative continuous fibula. The position of the fibular malleolus, union of the fibula, and the tri- or quadricortical position of the screw were assessed based on four successive x-rays. RESULTS:Tricortical positioning of the syndesmotic screw was significantly associated with proximal migration of the fibular malleolus during lengthening (P=0.0248<0.05). However, there was no significant relation between an unhealed fibula and proximal migration of the fibular malleolus when the screw was removed (P=0.164>0.05). DISCUSSION:Proximal migration of the fibular malleolus during lengthening is promoted by placing a non-quadricortical syndesmotic screw. Quadricortical positioning of the screw should be recommended. Migration of the fibular malleolus after ablation of the syndesmotic screw seems to be related to absence of fibular union but this series was too small to demonstrate this clearly. LEVEL OF EVIDENCE:Level IV: Retrospective study.
journal_name
Orthop Traumatol Surg Resjournal_title
Orthopaedics & traumatology, surgery & research : OTSRauthors
Camus D,Launay F,Guillaume JM,Viehweger E,Bollini G,Jouve JLdoi
10.1016/j.otsr.2014.06.011subject
Has Abstractpub_date
2014-10-01 00:00:00pages
637-40issue
6issn
1877-0568pii
S1877-0568(14)00165-0journal_volume
100pub_type
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