title: Intrapelvic migration of hip lag screw of proximal femoral nail-sequele to a paradoxical reverse Z effect and their critical analysis.
abstract: A 40-year-male treated with hip screw for unstable inter trochanteric fracture femur, had an implant failure after an aggressive therapy session .The Dynamic Condylar Screw was removed and fracture was fixed with Proximal Femoral Nail. The nail also failed to achieve its goal of fracture union, as a result of a unique type of reverse Z effect, in contradiction to expected Z effect resulting in intrapelvic migration of proximal hip lag screw of the proximal femoral nail.
authors.affiliation: Specialist and Assistant Professor, Department of Orthopaedics, Postgraduate Institute of Medical Education and Research, Dr. Ram Manohar Lohia Hospital, New Delhi, India.
authors.forename: Hitesh
authors.initials: H
authors.lastname: Lal
authors.affiliation: Senior Resident, Department of Orthopaedics, Postgraduate Institute of Medical Education and Research, Dr. Ram Manohar Lohia Hospital, New Delhi, India.
authors.forename: Deepak Kumar
authors.initials: DK
authors.lastname: Sharma
authors.affiliation: Professor & Head of Department, Department of Orthopaedics, Postgraduate Institute of Medical Education and Research, Dr. Ram Manohar Lohia Hospital, New Delhi, India.
authors.forename: Deepak
authors.initials: D
authors.lastname: Mittal
keywords: Intrapelvic migration; Lag screw; Proximal femoral nail; Z effect