Hip Pelvis.  2016 Sep;28(3):142-147. 10.5371/hp.2016.28.3.142.

Result of Modular Necks in Primary Total Hip Arthroplasty with a Average Follow-up of Four Years

• Yi J
• Han KY
• Nam YJ
• Kim KW

• KMID: 2354545
• DOI: http://doi.org/10.5371/hp.2016.28.3.142

Abstract

PURPOSE
This study aimed to investigate the outcomes of modular neck-utilization in primary total hip arthroplasty (THA).
MATERIALS AND METHODS
Thirty patients (34 hips) who had modular stem THA between April 2011 and January 2013 were evaluated. There were 19 men and 11 women with a mean age of 61.2 years at the time of surgery. There were 20 cases of osteonecrosis of femoral head, 7 cases of osteoarthritis, 6 cases of femur neck fracture, and 1 case of rheumatoid arthritis. No patients presented with anatomical deformity of hip. Patients were operated on using a modified Watson-Jones anterolateral approach. All patients underwent clinical and radiological follow-up at 6 weeks, 3, 6, and 12 months, and every year postoperatively. The mean duration of follow-up was 48.2 months (range, 39 to 59 months).
RESULTS
The average Harris hip score improved from 63.7 to 88.1 at the final follow-up. Radiographically, mean acetabular cup inclination was 45.3°(range, 36°-61°) and anteversion was 21.7°(range, 11°-29°). All were neutral-positioned stems except 5 which were varus-positioned stems. In only 3 cases (8.8%), varus or valgus necks were required. A case of linear femoral fracture occurred intraoperatively and 1 case of dislocation occurred at postoperative 2 weeks. No complications at modular junction were occurred.
CONCLUSION
Our study shows that the use of modular necks had favorable clinical and radiographic results. This suggests that the use of modular neck in primary THA without anatomical deformity is safe at a follow-up of 39 months.

Keyword

Modular neck; Modular stem; Arthroplasty; Replacement; Hip

MeSH Terms

Acetabulum
Arthritis, Rheumatoid
Arthroplasty
Arthroplasty, Replacement, Hip*
Congenital Abnormalities
Dislocations
Female
Femoral Fractures
Femoral Neck Fractures
Follow-Up Studies*
Head
Hip
Humans
Male
Neck*
Osteoarthritis
Osteonecrosis

Figure

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  Fig. 1 (A) M/L taper with Kinectiv® (Zimmer, Warsaw, IN, USA) is shown. (B) Kinectiv® neck provisional tray is shown.

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  Fig. 2 (A) Hip anteroposterior (AP) radiograph of 62 years old male patient implanted with a valgus neck. (B) Hip AP radiograph of 56 years old male patient implanted with a varus neck.

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