Metal block augmentation for bone defects of the medial tibia during primary total knee arthroplasty

Journal of Orthopaedic Surgery and Research

Munenori Matsueda²  Motohiro Wakui¹  Sachiyuki Tsukada¹ 

[1] Department of Orthopaedic Surgery, Nekoyama Miyao Hospital, 14-7 Konan, Chuo-ku, Niigata 950-1151, Japan;Department of Orthopaedic Surgery, Niigata Central Hospital, Niigata Japan

关键词: Midterm result;    Stem;    Augmentation;    Metal;    Bone deficiency;    Total knee arthroplasty;   

Others  :  814380
DOI  :  10.1186/1749-799X-8-36

 received in 2013-06-30, accepted in 2013-10-08,  发布年份 2013

【 摘 要 】

Background

Stable and well-aligned placement of tibial components during primary total knee arthroplasty is challenging in patients with bone defects. Although rectangular block-shaped augmentations are widely used to reduce the shearing force between the tibial tray and bone compared with wedge-shaped augmentations, the clinical result remains unclear. This study aimed to evaluate the outcome of primary total knee arthroplasty with metal block augmentation.

Methods

We retrospectively reviewed the 3- to 6-year follow-up results of 33 knees that underwent total knee arthroplasty with metal block augmentation (metal-augmented group) for bone defects of the medial tibia and 132 varus knees without bone defects as the control group. All surgeries were performed using posterior-stabilized cemented prostheses in both groups. Cemented stems were routinely augmented when the metal block was used.

Results

There were no differences in implant survival rates (100% in metal-augmented and 99.2% in control) or knee function scores (82 points in metal-augmented and 84 points in control) between the two groups at the final follow-up examination (P = 0.60 and P = 0.09, respectively). No subsidence or loosening of the tibial tray was observed. Of 33 metal-augmented total knee arthroplasties, a nonprogressive radiolucent line beneath the metal was detected in 10 knees (30.3%), and rounding of the medial edge of the tibia was observed in 17 knees (51.5%).

Conclusions

The clinical results of total knee arthroplasty with metal augmentation were not inferior to those in patients without bone defects. However, radiolucent lines were observed in 30.3%.

【 授权许可】

   
2013 Tsukada et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

Figure 1.

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