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Slotted intramedullary hip screw nails reduce proximal mechanical unloading
Dominique C R Hardy1, Konstantin Drossos
1Orthopaedics and Traumatologic Surgery, University Hospital Saint-Pierre, 12 Rue du Camp, B-1130 Brussels, Belgium. dominique.hardy@belgacom.net
Clinical Orthopaedics and Related Research
|February 13, 2003
Summary
Dynamically locked intramedullary hip screws significantly reduce stress shielding and thigh pain in intertrochanteric femoral fractures. This improved fixation offers better patient tolerance compared to traditional methods.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Trauma Care
Background:
- Intertrochanteric femoral fractures often lack medial buttress support.
- Proximal stress shielding and midthigh pain are common complications.
- Intramedullary hip screws are standard fixation devices.
Purpose of the Study:
- To evaluate if a dynamically locked intramedullary hip screw prevents proximal stress shielding in intertrochanteric fractures.
- To compare the incidence of stress shielding and associated pain between two locking methods.
Main Methods:
- Prospective, randomized study of 80 patients with intertrochanteric femoral fractures.
- Group A: Dynamically locked nail with two screws (n=30).
- Group B: Dynamically locked nail with one screw through a slot (n=34).
- Follow-up averaged 37 months, assessing cortical hypertrophy and pain.
Main Results:
- Significantly fewer patients in Group B (1/34) showed cortical hypertrophy compared to Group A (6/30).
- Cortical hypertrophy, indicative of stress shielding, was less frequent with the single-screw slot fixation.
- No significant differences in other outcomes were observed between the groups.
Conclusions:
- Dynamic locking with a single screw through a slot demonstrates superior tolerance and reduced stress shielding.
- This technique maintains the benefits of intramedullary nailing for these fractures.
- Late tolerance of the dynamically locked nail is favorable.