Cemented Total Hip Arthroplasty With Retrograde Ischioacetabular Steinmann Pin Reconstruction for Periacetabular Metastatic Carcinoma.

BACKGROUND

Surgical management of advanced periacetabular lesions is challenging because of extensive bone loss, particularly for Modified American Academy of Orthopaedic Surgeons Classification defects type IV (pelvic discontinuity with posterior column involvement). Multiple methods for rebuilding the acetabulum have been described; all involve passing Steinmann pins in a retrograde or an antegrade fashion from the anterior iliac wing or iliac crest around the acetabulum in an attempt to recreate the normal bony anatomy. However, these techniques fail to engage the ischium in its entirety. The ischial contribution to the posterior column is a critical element in a stable acetabular construct.

METHODS

After curettage of the acetabular lesion, Steinmann pins are passed through the ischial tuberosity and posterior column into the sciatic buttress in a retrograde manner. The number of pins depends on the size of the defect and involvement of the posterior column.

PATIENTS AND METHODS

Medical records of 11 patients with a Modified American Academy of Orthopaedic Surgeons Classification defect type IV treated with retrograde ischioacetabular Steinmann pin reconstruction at our institution between 2007 and 2012 were reviewed. European Quality of Life-5 dimensions and Lower Extremity Functional Scale questionnaires were used to assess patient functional outcomes.

RESULTS

The 6 patients (4 females and 2 males; age range, 56-81 years) surviving 12 months postoperatively reported improved mobility and good quality-of-life scores.

CONCLUSION

We described a new method for posterior acetabular column reconstruction that uses the ischial tuberosity and body as additional points of stabilization during the reconstruction of the posterior column.