What question did this study set out to answer?

The aim is to evaluate a new method for correcting high hip dislocation using a motorized nail before hip arthroplasty.

February 2, 2026JBJS Case Connector0 citations

Distalization with Motorized Intramedullary Nail for High Dislocation of the Hip Before Arthroplasty

MMMathias Mosfeldt HBHarald Brismar RWRichard Wallensten

Key Points

The aim is to evaluate a new method for correcting high hip dislocation using a motorized nail before hip arthroplasty.
Involved three patients with chronic high hip dislocation and limb length discrepancy.
Utilized gradual soft tissue distraction using a motorized intramedullary nail.
Patients were monitored for at least one year post-treatment.
Achieved near-anatomical cup positioning in all cases without the need for osteotomy.
Complications included one case of early infection and transient foot drop, which resolved.
Indicated that further refinements could minimize risks and improve outcomes.

Abstract

Case: We present 3 patients (a 19-year-old man, a 37-year-old woman, and a 66-year-old woman) with chronic high hip dislocation and severe limb length discrepancy, managed with gradual soft tissue distraction using a motorized intramedullary nail and a temporary cup before total hip arthroplasty. All patients had at least 1 year of follow-up. Complications included transient foot drop (resolved), and 1 case of early infection and persistent foot drop. Conclusion: This approach facilitates near-anatomical cup positioning without osteotomy but still carries risks. Further refinement, including shear wave elastography ultrasound monitoring of the ischial nerve, may reduce complications and improve the method.

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