A prospective case series for a minimally invasive internal fixation device for anterior pelvic ring fractures
Volume
11
Publisher
Publisher URL
DOI
10.1186/s13018-016-0468-9
Journal
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
ISSN
1749-799X
Metadata
Show full item recordAbstract
Background: External fixation is commonly used as a means of definitive fixation of pelvic fractures. Pin site
infection is common, with some cases of osteomyelitis and inpatient nursing can be challenging. The aim of this
study is to report the outcomes and complications of an alternative minimally invasive technique, known as INFIX,
utilising spinal pedicle screws inserted into the supra-acetabular bone and connected by a subcutaneous rod.
Methods: A single-centre prospective case series was performed. The primary outcome measures were fracture
stability and displacement at time of implant removal and intra- and post-operative complications.
Results: Twenty-one patients were recruited, with 85.7 % of fractures being lateral compression type. Mean follow-up
was 342 days. Mean application time was 51 min (range 44–65). Nineteen were removed electively, with mean time to
removal 109 days. All cases were stable with no displacement. Two cases were removed emergently, one due to
wound infection and the other due to lateral femoral cutaneous nerve neuropathic pain. Twelve patients sustained a
lateral femoral cutaneous nerve palsy, with 20/42 nerves being affected. Improvement in all lateral femoral cutaneous
nerve symptoms were reported with removal. Nine patients developed asymptomatic heterotopic ossification, and
there were three deep infections and one symptomatic due to the bar.
Conclusions: Minimally invasive internal fixation with the INFIX for anterior pelvic ring fractures is an alternative to
anterior external fixation. However, a higher rate of lateral femoral cutaneous nerve palsy is noted, and the implant is
not well tolerated by all patients. Further studies are required to define fracture types and patients best suited to the
technique and how LFCN complications may be minimised.
Trial registration: ACTRN12616001421426. Registered 12 October 2016. Retrospectively registered.