J Korean Bone Joint Tumor Soc.  2011 Jun;17(1):36-43. 10.5292/jkbjts.2011.17.1.36.

Functional and Radiological Results of Intermediate-term Follow Up in MUTARS(R) Tumor Endoprostheses

• Kang DJ
• Kim JI
• Oh JS
• Moon TY
• Lee IS

• KMID: 2137042
• DOI: http://doi.org/10.5292/jkbjts.2011.17.1.36

Abstract

PURPOSE
This study was designed to verify intermediate-term functional and radiological results of limb salvage operation using endoprosthetic replacement system (MUTARS(R)) used in patients with a malignant bone tumor.
MATERIALS AND METHODS
Thirty one cases which used MUTARS(R) tumor prosthesis were reviewed. The mean age of the patients was 49.2 years and the mean follow up was 39.8 months. We retrospectively reviewed complications, and evaluated functionally and radiologically by Enneking functional score, ISOLS radiological implants evaluation system at last follow-up.
RESULTS
3 patients had died of disease, distant metastasis was seen in 4 patients and local recurrence was seen in 1 patients. Complications were developed in 12 patients. (infection 6, leg length discrepancy 2, aseptic loosening 2, periprosthetic femoral fracture 1, screw loosening 1) Mean value of total functional scores were 81.2% in proximal femur, 77.4% in distal femur, 78.1% in proximal tibia, and 80.2% in proximal humerus. The overall radiological result was relatively satisfactory.
CONCLUSION
Our results suggest limb salvage with the MUTARS(R) endoprosthesis is successful with good functional and radiological results. But we should be careful with complications such as infection.

Keyword

extremities; bone tumor; prosthetic reconstruction; functional and radiologic evalutation

MeSH Terms

Extremities
Femoral Fractures
Femur
Follow-Up Studies
Humans
Humerus
Leg
Limb Salvage
Neoplasm Metastasis
Prostheses and Implants
Recurrence
Retrospective Studies
Tibia

Figure

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  Figure 1. (A) An AP radiograph with digital planning of a MUTARS® tumor prosthesis is shown for a 67-year-old man with an malignant fibrous histiocytoma of the left distal femur. (B) Anteroposterior and (C) lateral radiographs show a cemented distal femur replacement.

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  Figure 2. An intraoperative photograph shows a proximal tibia replacement and the Trevira® (Implantcast) tube placed around the prosthesis. The patellar tendon was refixated to the tube by sutures.

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  Figure 3. (A) An intraoperative photograph shows a antibiotic-impregnated cement spacer (B) Anteroposterior and (C) lateral radiographs.

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  Figure 4. Aseptic loosening after cemented fixation of MUTARS®.

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  Figure 5. Roentgenographic findings after femoral shaft periprosthetic fracture (Vancouver classification B1). (A) Preoperative anteroposterior view. (B) Postoperative anteroposterior view. (C) The radiograph taken 5 months later shows healing of the fracture.

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