J Korean Orthop Assoc.  2007 Dec;42(6):730-736. 10.4055/jkoa.2007.42.6.730.

Total Knee Arthroplasty with NexGen(R) System: 3-8 Year Follow-up Results

• Jung KH
• Cho SD
• Go SH
• Cha JR
• Lee CC
• Youm YS
• Park KB

• KMID: 1947778
• DOI: http://doi.org/10.4055/jkoa.2007.42.6.730

Abstract

PURPOSE: To evaluate the 3 to 8 year follow-up clinical and radiological results after NexGen(R) total knee arthroplasty (TKA).
MATERIALS AND METHODS
Ninety-six knees in 75 patients, who could be followed up more than 3 years after NexGen(R) TKA [cruciate retaining (CR) type:34, posterior cruciate substituting (PS) type:62] from March 1997 to May 2002, were evaluated retrospectively. The evaluations included the preoperative and postoperative range of motion (ROM), Knee Society Score (KSS), knee functional score, tibiofemoral angle and postoperative complications.
RESULTS
The ROM increased from preoperative mean flexion contracture of 9.3 degrees and further flexion of 116.4 degrees to a postoperative mean flexion contracture of 2.1 degrees and further flexion of 126.3 degrees (ROM: 124.2 degrees). The ROM of CR type improved from 112.7 degrees to 123.1 degrees, and the PS type improved from 105.3 degrees to 124.9 degrees (p>0.05). The KSS and knee function score improved from 54 and 41 before surgery to 94 and 87 after surgery, respectively (p>0.05). The tibiofemoral angle changed from preoperative varus 5.7 degrees to postoperative valgus 5.2 degrees. The complications were two cases of infection and two cases of early loosening.
CONCLUSION
The 3 to 8 year follow-up results after NexGen(R) TKA were satisfactory in both the CR and PS types. However, a longer term follow-up evaluation will be necessary.

Keyword

NexGen(R) TKA; Cruciate retaining; Cruciate substituting

MeSH Terms

Arthroplasty*
Contracture
Follow-Up Studies*
Humans
Knee*
Postoperative Complications
Range of Motion, Articular
Retrospective Studies

Figure

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  Fig. 1 Postoperative (A) anteroposterior and (B) lateral radiographs of a 41months follow-up after revision arthroplasty due to an infection also show severe osteolytic changes around the implants.

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  Fig. 2 Radiographs of the early loosening of femoral component: (A) immediate postoperative anteroposterior and lateral radiographs with the PS type TKA in a 56 years old female with osteoarthritis (B) postoperative 10months anteroposterior and lateral radiograph (C) postoperative 42 months anteroposterior and lateral radiographs showing a gap between the femoral component and femur. (D) Post-revision anteroposterior and lateral radiographs.

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  Fig. 3 Radiographs of the early loosening of the femoral and tibial component (A) postoperative 52 months anteroposterior and lateral radiographs showing severe osteolysis with a varus deformity (B) The bone defect of the medial tibia plateau was filled with a femoral head allograft (C) post-revision anteroposterior and lateral radiographs.

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