Ömer Yonga1, Kaya Memişoğlu2, Tolga Onay3

1Department of Orthopedics and Traumatology, Tuzla State Hospital, Istanbul, Turkey
2Department of Orthopedics and Traumatology, Kocaeli University Faculty of Medicine, Kocaeli, Turkey
3Department of Orthopedics and Traumatology, Dr. Lütfi Kırdar City Hospital, Istanbul, Turkey

Keywords: Acetabuloplasty, developmental dysplasia of the hip, osteotomy, Tönnis.


Objectives: This study aimed to present the clinical and radiological results of a large patient group operated by Tönnis lateral acetabuloplasty (TLA) for developmental dysplasia of the hip (DDH).

Patients and methods: The retrospective study was conducted with 66 hips of 41 patients (5 males, 36 females; mean age: 32.3±18 months; range, 11 to 132 months) operated for DDH using the TLA technique in a single center between February 2012 and December 2016. Adductor tenotomy was performed on 52 (79%) hips. There was a need for additional femoral shortening and derotation-varization osteotomy in 14 (21%) hips. Clinical outcomes were evaluated with modified McKay criteria. The acetabular index and lateral migration index for the subluxated hip were calculated, and the femoral head position was evaluated according to Perkin’s line and Shenton’s line. The Severin classification was used to assess the outcome of the hips.

Results: The mean follow-up period was 27±11 months. According to the modified McKay criteria for DDH, 77.3% of hips were classified as excellent, 16.6% as good, and 6.1% as fair. The mean acetabular index decreased from 36.1° preoperatively to 18.6° postoperatively. The mean postoperative improvement for the acetabular index was 17.5±5. The lateral migration index improved from 89.7 to 10.6%. A statistically significant difference was determined between the preoperative and postoperative measurements of the acetabular index and lateral migration index (p<0.001).

Conclusion: Tönnis lateral acetabuloplasty was found to be safe and effective with a low learning curve, and successful treatment decreases the duration of follow-up required in patients with DDH.

Citation:Yonga Ö, Memişoğlu K, Onay T. Early and mid-term results of Tönnis lateral acetabuloplasty for the treatment of developmental dysplasia of the hip. Jt Dis Relat Surg 2022;33(1):208-215.

Conflict of Interest

The authors declared no conflicts of interest with respect to the authorship and/or publication of this article.

Financial Disclosure

The authors received no financial support for the research and/or authorship of this article.