J Korean Hip Soc.  2012 Mar;24(1):25-31. 10.5371/jkhs.2012.24.1.25.

Comparative Analysis of Two Cementless Stems in Total Hip Arthroplasties in Patients with Osteonecrosis of Femoral Head: Summit(R) Stem and Bencox(R) Stem

• Lim YW
• Lee KH
• Bae SH
• Kwon SY

• KMID: 2014894
• DOI: http://doi.org/10.5371/jkhs.2012.24.1.25

Abstract

PURPOSE
We compared the clinical and radiological outcomes of total hip arthroplasty (THR) using Summit and Bencox stems.
MATERIALS AND METHODS
The patients who underwent cementless total hip arthroplasty were recruited with a satisfactory condition of a minimum three years of follow-ups after THR. Those patients were divided into two groups, those with Summit stems and those with Bencox stems. Summit stems were in 36 patients(40 hips), and Bencox stems in 36 patients(48 hips). Summit and Bencox stems had 78 months and 42.2 months as a mean follow-up, respectively. The clinical and radiological evaluations of femoral components were performed.
RESULTS
There was no difference in clinical results between the two groups. Under the radiological findings, there were no osteolytic changes or loosening. Osseointegration was detected at an average of 6.4 months(3-12 months) in the Bencox stem on the distal portion of the femoral stem, and cortical hypertrophy was detected on 6 hips with a Summit stem.
CONCLUSION
The clinical and radiological evaluations in both systems showed excellent outcomes at the three year follow-ups, and there was no statistical difference on the clinical and radiological results between the two groups. Thigh pain and cortical hypertrophy were not detected in the Bencox stem, and that wound would be caused by surface treatment methods of the femoral stem, and morphological differences.

Keyword

Total hip arthroplasty; Summit(R) stem; Bencox(R) stem

MeSH Terms

Arthroplasty
Follow-Up Studies
Hip
Humans
Hypertrophy
Osseointegration
Osteonecrosis
Thigh

Figure

• 

  Fig. 1 A 55-years-old woman. (A) A postoperative AP radiograph, (B) AP radiograph taken at the 12 months followup begins to show cortical hypertrophy at the distal portion of stem (white arrow), and the patient complained of thigh pain. (C) AP radiograph taken at the 36 months followup shows the cortical hypertrophy precisely (white arrow).

• 

  Fig. 2 A 63-years-old man. (A) A postoperative AP radiograph, (B) AP radiograph taken at the 6 months followup begins to show prosthesis to bone union at the distal portion of stem (white arrow). (C) AP radiograph taken at the 36 months followup shows prosthesis to bone union precisely (white arrow).

• 

  Fig. 3 A 58-years-old man. His diagnosis is osteonecrosis of femoral head. On the right side, he was performed THR using Summit stem 6 years ago, and on the left side, performed THR using BENCOX stem 3 years ago. He complained of right thigh pain. (A) A postoperative AP radiograph shows right proximal femur cortical hypertrophy (arrow). (B) A whole body bone scan shows hot uptake on the right proximal femur (arrow).

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