# Uncharted Territories: Dynamic Hip Screw Migration Into the Pelvis Requiring Laparotomy

## TL;DR

A rare case of a hip screw migrating into the pelvis and requiring surgery is reported in a 71-year-old man with a history of hip fracture and osteoporosis.

## Contribution

This paper reports a rare complication of dynamic hip screw migration into the pelvis requiring laparotomy, which has not been previously documented in literature.

## Key findings

- The dynamic hip screw migrated through the acetabulum into the pelvis six months after implantation.
- The patient required a laparotomy to remove the migrated implant.
- No visceral injuries were detected despite the implant migration.

## Abstract

Hip fractures are common in patients with poor bone quality and are seen to affect the elderly and frail population. We report a case of implant failure after fixing an unstable intertrochanteric fracture with a dynamic hip screw (DHS). The patient presented with a DHS that had migrated into the pelvis approximately six months after surgery. Plain radiographs showed migration of the DHS through the acetabulum and into the pelvis. Migration of DHS into the pelvis is an extremely rare complication and has only been reported a few times. A 71-year-old man presented with a fall and confusion. The patient reported having a fall but could not recall the exact events. Past medical history included Alzheimer's dementia, osteoporosis, left total hip replacement, right DHS, peripheral neuropathy, and recurrent falls. He had undergone reduction and fixation of a right intertrochanteric fracture with DHS implant via direct lateral approach six months before hospital admission. On examination, he had right-sided hip pain and was unable to straighten leg raise. His abdomen was soft and non-tender, with no distension or palpable masses. Neurovascular status was normal, and no signs of infection were detected. On the anteroposterior radiograph, the implant seemed to have migrated through the acetabulum and into the abdomen. A CT of the abdomen and pelvis was performed to identify any visceral injuries (negative) and for surgical planning. The patient underwent a midline laparotomy to remove the implant. Although the exact reason for the implant failure is unknown, the migration of an unbroken hip screw into the abdomen and pelvis requiring laparotomy has not been reported in literature.