J Korean Orthop Assoc.  2009 Apr;44(2):186-191.

Short Term Result of Minimally Invasive Total Knee Arthroplasty with Mini-Midvastus Approach

• Yoo JH
• Yoon HK
• Han CD
• Yoon HS
• Lee YT
• Oh HC
• Sung SY
• Chung HS

Abstract

PURPOSE
To investigate the effectiveness of minimally invasive total knee arthroplasty using the mini-midvastus approach through analyzing the short-term clinical outcomes. MATERIALS AND METHODS: Seventy-seven consecutive total knee arthroplasties were performed with the mini-midvastus surgical technique from August 2005 to February 2006 and were followed for more than 1 year after the procedure. All operations were performed with the Nexgen LPS-flex total knee system using a MIS quad-sparing instrument. The evaluation included preoperative and postoperative clinical data, surgical and radiological outcomes. RESULTS: The length of skin incision was average 8.4+/-0.6 cm and the operation time was average 95.5+/-15.7 minutes. The blood loss was average 727.5+/-315.5 cc. The tibial component alignment angles averaged 0.2+/-1.3degrees varus and the tibiofemoral angles averaged 5.8+/-1.8degrees. The mean ROM and the mean HSS score was 117+/-10degrees and 120+/-11degrees, 88.9+/-7.1 and 96.2+/-4.5 at eight weeks and one year after surgery respectively. CONCLUSION: If proper surgical procedures are performed using the appropriate surgical instruments, minimally invasive total knee arthroplasty with the assistance of the mini-midvastus approach, can result in good clinical outcomes and alignment of the implants.

Keyword

Knee; Total knee arthroplasty; Minimal invasive; Mini-midvastus approach

MeSH Terms

Arthroplasty
Knee
Skin
Surgical Instruments

Figure

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  Fig. 1 The arthrotomy started from the supero-medial border of the patella followed along the medial border of the patella, and finished at the medial border of the tibial tuberosity, and added 1.5 cm to the incision parallel to the direction of the vastus medialis oblique muscle fiber to the proximal direction.

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  Fig. 2 The length of the postoperative scar was measured with the knee in full extension after wound closure.

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  Fig. 3 The length of the split vastus medialis was measured from the superomedial corner of the patella to the upper limit of the split vastus medialis.

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