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Peer-reviewedCC BY-NCZagazig University Medical Journal

Is there a difference between Fully Threaded and Partially Threaded Cannulated Screws for In Situ Pinning of Slipped Capital Femoral Epiphysis?

  • Mena Nabih Salib1
  • Hossam Khairy2
  • Ahmed Abdelwahab3
  • Bassam Ouda4
  • Ahmad Zaki Eissa4
4 affiliations
  1. 1Department of Orthopedic Surgery, Faculty of Medicine, Zagazig University, Zagazig, Egypt
  2. 2Professor of Orthopedic Surgery, Faculty of Medicine, Zagazig University, Zagazig, Egypt
  3. 3Assistant Professor of Orthopedic Surgery, Faculty of Medicine, Zagazig University, Zagazig, Egypt
  4. 4Lecture of Orthopedic Surgery, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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Abstract

Background: In situ fixation with a single cannulated screw is standard for stable, mild-to-moderate slipped capital femoral epiphysis (SCFE), but whether partially versus fully threaded screws affects outcome is debated. We compared clinical and radiological outcomes of partially versus fully threaded screws for in situ SCFE fixation. Methods: This prospective, randomized study (Zagazig University, November 2024–November 2025) included 24 patients (32 hips; 8 bilateral) with stable or unstable SCFE, randomly allocated to fully threaded (16 hips) or partially threaded (16 hips) fixation. Outcomes were assessed at a minimum of 12 months using the Harris Hip Score (HHS), Southwick/alpha/neck-shaft angles, femoral neck growth, physeal closure, and complications. Results: Groups were matched at baseline (all p>0.05). Mean HHS improved from 69.5 ± 7.3 to 90.9 ± 6.6, with no significant difference between groups (90.0 ± 7.8 vs 91.8 ± 5.2; p=0.608). Radiographic correction, femoral neck growth, return to activity, and composite outcome grading were comparable. Physeal closure rate did not differ significantly (62.5% vs 81.25%; p=0.433), but time to closure among closed hips was significantly shorter with partially threaded screws (9.6 ± 0.7 vs 10.8 ± 0.4 months; p<0.001). Complication rate was 37.5%, with no revisions and one AVN case in the fully threaded group. Conclusion: Fully and partially threaded cannulated screws provide equivalent clinical, functional, and radiological outcomes with comparably low complication rates for in situ SCFE fixation at 12 months. Partially threaded screws were associated with significantly earlier physeal closure, a novel finding requiring confirmation in larger, multicenter studies.

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Cite

BibTeXRIS
BibTeX
@article{salib2026there,
  title = {{Is there a difference between Fully Threaded and Partially Threaded Cannulated Screws for In Situ Pinning of Slipped Capital Femoral Epiphysis?}},
  author = {Mena Nabih Salib and Hossam Khairy and Ahmed Abdelwahab and Bassam Ouda and Ahmad Zaki Eissa},
  journal = {Zagazig University Medical Journal},
  year = {2026},
  month = oct,
  doi = {10.21608/zumj.2026.529726.4831},
  url = {https://doi.org/10.21608/zumj.2026.529726.4831},
  note = {CC BY-NC},
}
RIS
TY  - JOUR
TI  - Is there a difference between Fully Threaded and Partially Threaded Cannulated Screws for In Situ Pinning of Slipped Capital Femoral Epiphysis?
AU  - Mena Nabih Salib
AU  - Hossam Khairy
AU  - Ahmed Abdelwahab
AU  - Bassam Ouda
AU  - Ahmad Zaki Eissa
PY  - 2026
DA  - 2026/10/25
JO  - Zagazig University Medical Journal
DO  - 10.21608/zumj.2026.529726.4831
UR  - https://doi.org/10.21608/zumj.2026.529726.4831
AB  - Background: In situ fixation with a single cannulated screw is standard for stable, mild-to-moderate slipped capital femoral epiphysis (SCFE), but whether partially versus fully threaded screws affects outcome is debated. We compared clinical and radiological outcomes of partially versus fully threaded screws for in situ SCFE fixation. Methods: This prospective, randomized study (Zagazig University, November 2024–November 2025) included 24 patients (32 hips; 8 bilateral) with stable or unstable SCFE, randomly allocated to fully threaded (16 hips) or partially threaded (16 hips) fixation. Outcomes were assessed at a minimum of 12 months using the Harris Hip Score (HHS), Southwick/alpha/neck-shaft angles, femoral neck growth, physeal closure, and complications. Results: Groups were matched at baseline (all p>0.05). Mean HHS improved from 69.5 ± 7.3 to 90.9 ± 6.6, with no significant difference between groups (90.0 ± 7.8 vs 91.8 ± 5.2; p=0.608). Radiographic correction, femoral neck growth, return to activity, and composite outcome grading were comparable. Physeal closure rate did not differ significantly (62.5% vs 81.25%; p=0.433), but time to closure among closed hips was significantly shorter with partially threaded screws (9.6 ± 0.7 vs 10.8 ± 0.4 months; p<0.001). Complication rate was 37.5%, with no revisions and one AVN case in the fully threaded group. Conclusion: Fully and partially threaded cannulated screws provide equivalent clinical, functional, and radiological outcomes with comparably low complication rates for in situ SCFE fixation at 12 months. Partially threaded screws were associated with significantly earlier physeal closure, a novel finding requiring confirmation in larger, multicenter studies.
SN  - 2357-0717
SN  - 1110-1431
ER  -