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November 13-14, 2019 | London, UK
ORTHOPEDICS, OSTEOPOROSIS & TRAUMA
12
th
International Conference on
Journal of Orthopaedics Trauma Surgery and
Related Research
Orthopedics 2019
November 13-14, 2019
J Orthop Trauma Surg Rel Res, Volume 14
Volume: 14 | ISSN: 1897-2276
Tibial polyethylene insert locking mechanism in posterior stabilized arthroplasty can
fail with or without trauma
Shady Hermena
Worcestershire Royal Hospital, UK
M
odular knee replacement systems allow intra-operative flexibility in component choice. Tibial polyethylene inserts locking
mechanisms have been developed to reduce micro-motion and backside wear of the tibial insert.
Case report
: We describe a case of failure of the locking mechanism in a posterior stabilised primary knee replacement 6 years
after the initial surgery. There was a previous history of trauma 9 months before presentation. Radiographs confirmed failure
of the locking-bar with migration to the medial side of the knee. The tibial insert and locking-bar were revised, and the patient
made a full recovery.
Conclusion
: Locking mechanism is essential to reduce back wear in modular total knee arthroplasty systems. However,
disengagement between the polyethylene insert and the metal base plate has been reported in early and late stages after surgery.
Clinical Massage
: This case report describes one mode of failure to be considered when a patient presents with a painful knee
replacement. Similar case has been reported in 2012 by E. Thienpont without a history of trauma. We are not aware of any similar
case reports in the English literature. Diagnosis of a locking-bar failure can be easily diagnosed by anteroposterior radiographs.
Keywords
: Modular knee replacement, failure of the locking mechanism, posterior stabilized primary knee replacement.
Biography
Shady Hermena is trauma and orthopaedic middle grade in Yeovil District Hospital NHS Foundation Trust. Shady was graduated from
the faculty of medicine at Assiut University in Egypt in 2007. He completed his basic training in trauma and orthopaedic surgery in
Egypt. He was awarded a master's degree in trauma and orthopaedic surgery from Assiut university (Egypt) after completing primary
research evaluating the results of using the Triple Neurotization technique for reconstruction of upper trunk brachial plexus in adult
juries. In 2016 he was awarded the membership of the royal college of surgeons of England. In 2017 he moved his training to the UK
and started to work in the NHS.
shadypaulis@hotmail.com