Patients with severe slipped capital femoral epiphysis treated by the modified Dunn procedure have low rates of avascular necrosis, good outcomes, and little osteoarthritis at long-term follow-up

Lerch, T. D.; Vuilleumier, S.; Schmaranzer, F.; Ziebarth, K.; Steppacher, S. D.; Tannast, M.; Siebenrock, K. A. (2019). Patients with severe slipped capital femoral epiphysis treated by the modified Dunn procedure have low rates of avascular necrosis, good outcomes, and little osteoarthritis at long-term follow-up. The Bone & Joint Journal, 101-B(4), pp. 403-414. British Editorial Society of Bone and Joint Surgery 10.1302/0301-620X.101B4.BJJ-2018-1303.R1

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AIMS: The modified Dunn procedure has the potential to restore the anatomy in hips with severe slipped capital femoral epiphyses (SCFE). However, there is a risk of developing avascular necrosis of the femoral head (AVN). In this paper, we report on clinical outcome, radiological outcome, AVN rate and complications, and the cumulative survivorship at long-term follow-up in patients undergoing the modified Dunn procedure for severe SCFE. PATIENTS AND METHODS: We performed a retrospective analysis involving 46 hips in 46 patients treated with a modified Dunn procedure for severe SCFE (slip angle > 60°) between 1999 and 2016. At nine-year-follow-up, 40 hips were available for clinical and radiological examination. Mean preoperative age was 13 years, and 14 hips (30%) presented with unstable slips. Mean preoperative slip angle was 64°. Kaplan-Meier survivorship was calculated. RESULTS: At the latest follow-up, the mean Merle d'Aubigné and Postel score was 17 points (14 to 18), mean modified Harris Hip Score was 94 points (66 to 100), and mean Hip Disability and Osteoarthritis Outcome Score was 91 points (67 to 100). Postoperative slip angle was 7° (1° to 16°). One hip (2%) had progression of osteoarthritis (OA). Two hips (5%) developed AVN of the femoral head and required further surgery. Three other hips (7%) underwent implant revision due to screw breakage or change of wires. Cumulative survivorship was 86% at ten-year follow-up. CONCLUSION: The modified Dunn procedure for severe SCFE resulted in a low rate of AVN, low risk of progression to OA, and high functional scores at long-term follow-up. The slip deformities were mainly corrected but secondary impingement deformities can develop in some hips and may require further surgical treatment.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Surgery
04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Lerch, Till; Schmaranzer, Florian; Ziebarth, Kai; Steppacher, Simon Damian; Tannast, Moritz and Siebenrock, Klaus-Arno

Subjects:

600 Technology > 610 Medicine & health

ISSN:

2049-4394

Publisher:

British Editorial Society of Bone and Joint Surgery

Language:

English

Submitter:

Christoph Steffen

Date Deposited:

11 Dec 2019 15:00

Last Modified:

27 Apr 2020 21:40

Publisher DOI:

10.1302/0301-620X.101B4.BJJ-2018-1303.R1

PubMed ID:

30929481

Additional Information:

This paper is also Sebastian Vuilleumier's doctoral thesis

BORIS DOI:

10.7892/boris.131182

URI:

https://boris.unibe.ch/id/eprint/131182

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