Journal List > J Korean Bone Joint Tumor Soc > v.17(1) > 1051990

Kang, Kim, Oh, Moon, and Lee: Functional and Radiological Results of Intermediate-term Follow Up in MUTARS® Tumor Endoprostheses

Abstract

Purpose

This study was designed to verify intermediate-term functional and radiological results of limb salvage operation using endoprosthetic replacement system (MUTARS®) used in patients with a malignant bone tumor.

Materials and Methods

Thirty one cases which used MUTARS® 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 followup.

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® endoprosthesis is successful with good functional and radiological results. But we should be careful with complications such as infection.

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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.
jkbjts-17-36f1.tif
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.
jkbjts-17-36f2.tif
Figure 3.
(A) An intraoperative photograph shows a antibiotic-impregnated cement spacer (B) Anteroposterior and (C) lateral radiographs.
jkbjts-17-36f3.tif
Figure 4.
Aseptic loosening after cemented fixation of MUTARS®.
jkbjts-17-36f4.tif
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.
jkbjts-17-36f5.tif
Table 1.
Primary Tumors and Metastases Before MUTARS® Implantation
Diagnosis Tumor entity Frequency
Primary tumor Osteosarcoma 12
Malignant fibrous histiocytoma 4
Chondrosarcoma 2
Giant cell tumor 1
Metastasis Hepatocellular cancer 3
Renal cell cancer 2
Prostate cancer 2
Lung cancer 2
Stomach cancer 1
Breast cancer 1
Thyroid cancer 1
Total 31
Table 2.
Complications in All 31 Patients
Infection
Stem loosening Periprosthetic fracture Mechanica failure
Tube (+) Tube (-)
Distal femur   1 2    
Proximal femur 2     1 1
Proximal tibia 3        
Proximal humerus          
Total 5/11 (45.5%) 1/20 (5%) 2/31 (6.9%) 1/31 (3.2%) 1/31 (3.2%)
Table 3.
Radiographic Analysis by ISOLS Radiologic Implant Evaluation System
Bone remodeling Interface Anchorage Implant body problem Implant articular problem
Poor 1 (3.5%) 2 (6.9%) 1 (3.5%) 0 (0%) 0 (0%)
Fair 8 (27.6%) 5 (17.2%) 1 (3.5%) 1 (3.5%) 2 (6.9%)
Good 17 (58.6%) 17 (58.6%) 7 (24.1%) 3 (10.3%) 4 (13.8%)
Excellent 3 (10.3%) 5 (17.2%) 20 (68.9%) 25 (86.2%) 23 (79.3%)
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