Midterm Results of Total Hip Arthroplasty Using the VerSys Fiber Metal Tapered Femoral Stem

Joon Soon Kang; Kyoung-Ho Moon; Bom Soo Kim; Dae Kyu Kwon; Jong Min Choi

doi:10.5371/hp.2012.24.2.79

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Kang, Moon, Kim, Kwon, and Choi: Midterm Results of Total Hip Arthroplasty Using the VerSys Fiber Metal Tapered Femoral Stem

Original Article

Hip & Pelvis

Hip & Pelvis 2012; 24(2): 79-86.

Published online: 30 June 2012

DOI: https://doi.org/10.5371/hp.2012.24.2.79

Midterm Results of Total Hip Arthroplasty Using the VerSys Fiber Metal Tapered Femoral Stem

Joon Soon Kang, MD, Kyoung-Ho Moon, MD, Bom Soo Kim, MD, Dae Kyu Kwon, MD, Jong Min Choi, MD

Department of Orthopaedic Surgery, Inha University School of Medicine, Incheon, Korea.

Address reprint request to Joon Soon Kang, MD. Department of Orthopaedic Surgery, Inha University School of Medicine, 7-206, Shinheung-dong 3-ga, Jung-gu, Incheon 400-103, Korea. TEL: +82-32-890-3669, FAX: +82-32-890-2380, kangjoon@inha.ac.kr

Received 17 April 2012 Revised 12 June 2012 Accepted 19 June 2012

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

We evaluated the clinical and radiological results of patients who received the cementless VerSys fiber metal tapered stem for total hip arthroplasty.

Materials and Methods

Thirty seven hip joint replacements(31 patients) were evaluated over a minimum four year period following the procedure with an average follow-up period of 56 months(48-96 months). The mean patient age was 47.9 years old. Clinical results were analyzed using Harris hip scores, incidence of thigh pain and radiographic analysis was used to assess fixation of the stem, stress shielding, cortical hypertrophy and radiolucent lines around the femoral stem.

Results

The average Harris hip score was 90.7 points(82-99 points). Thigh pain was noticed in 6 hips(16%). Proximal femoral bone resorption by stress shielding was observed in 32 hips(86.5%). Cortical hypertrophy was noticed in 16 hips(43.2%) and was statistically correlated with stress shielding of 2nd degree or more according to the Engh classification. Stable bone ingrowth at the last follow-up was seen in 36 hips(97.2%).

Conclusion

Cementless total hip arthroplasty using the cementless VerSys fiber metal tapered stem demonstrated excellent midterm clinical results as well as excellent radiologic results for stable fixation and endosteal new bone formtion. However, long term follow-up evaluation will be required because of the high rates of proximal bone resorption by stress shielding.

Keywords: Thigh pain, Stress shielding, Bone resorption, Total hip arthroplasty, Cementless, VerSys fiber metal tapered stem

Figures and Tables

Fig. 1

VerSys fiber metal tapered femoral stem.

Fig. 2

Radiographs show right femur neck fracture in 62 year old woman. (A) Preoperative radiography. (B) Immediate postoperative radiography. (C) At the last follow-up (56 months after total hip arthroplasty), extensive proximal bone resorption at zone 1 and 7 is observed. The clinical result was excellent.

Table 1

Engh's Classification of Stress Shielding

Table 2

Statistic Analysis of the Thigh Pain

Table 3

Statistic Analysis of the Stress Shielding

^*Significantly Correlated (P<0.05) with Stress Shielding Level.

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