Clin Orthop Surg.  2019 Dec;11(4):396-402. 10.4055/cios.2019.11.4.396.

Anterior Cortical Window Technique Instead of Extended Trochanteric Osteotomy in Revision Total Hip Arthroplasty: A Minimum 10-Year Follow-up

Affiliations
  • 1Department of Orthopaedic Surgery, Yeungnam University Medical Center, Daegu, Korea.
  • 2Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea. ykleemd@gmail.com
  • 3Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul, Korea.

Abstract

BACKGROUND
The anterior cortical window technique was developed to facilitate stem removal in revision total hip arthroplasty (THA). In this technique, only the anterior cortex of the proximal femur is osteomized; the trochanter, lateral cortex, and medial cortex remain intact. Therefore, a new stem can be press-fitted into the femur and mediolateral stability can be obtained. However, the long-term results of revision THA using this technique are unknown. We report the outcome and survivorship at a minimum of 10-year follow-up.
METHODS
From May 2003 to April 2006, 69 patients (75 hips) underwent revision THA using an anterior cortical window and a cementless distal interlocking stem. Of these, 50 patients (56 hips) were followed up for 10 to 13 years (mean, 11.5 years). There were 26 men (29 hips) and 24 women (27 hips) with a mean age of 51.2 years (range, 29 to 82 years) at the time of revision arthroplasty. We evaluated radiographs, Harris hip score, University of California at Los Angeles (UCLA) activity score, Koval category, and survivorship.
RESULTS
Nonunion of the osteotomy occurred in one hip (2%). Five stems (8.9%) subsided 5 mm or more. At the final evaluation, the mean Harris hip score, UCLA activity score, and the Koval category were 82.5, 4.6, and 1.5, respectively. Survivorship with any operations as the end point was 80.4% and that with stem-revision as the end point was 91.1%.
CONCLUSIONS
With use of an anterior cortical window, a well-fixed stem can be easily removed, and a new stem can be inserted with firm mediolateral stability in the proximal femur in revision THA. We recommend using this technique instead of the extended trochanteric osteotomy in revision THA.

Keyword

Arthroplasty; Replacement; Hip; Reoperation; Survival rate

MeSH Terms

Arthroplasty
Arthroplasty, Replacement, Hip*
California
Female
Femur*
Follow-Up Studies*
Hip
Humans
Male
Osteotomy*
Reoperation
Survival Rate

Figure

  • Fig. 1 Flowchart of the study. THA: total hip arthroplasty.

  • Fig. 2 Intraoperative photo of the anterior cortical window to remove a cemented stem.

  • Fig. 3 Bicontact long stem with a distal interlocking screw.

  • Fig. 4 Kaplan-Meier survival curve with any surgery (A) and re-revision of femoral stem (B) as the end point.

  • Fig. 5 (A) A 28-year-old man had acetabular protrusion after bipolar hemiarthroplasty. (B) Total revision was performed by using an anterior cortical window. (C) The stem was maintained without subsidence at 11.3 years after revision arthroplasty.


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