Journal List > J Korean Orthop Assoc > v.44(2) > 1012890

Song, Kim, Sung, Kong, and Ra: Autologous Chondrocyte Implantation for Articular Cartilage Defect of Femoral Condyle

Abstract

Purpose

To evaluate the midterm clinical and histological results after autologous chondrocyte implantation (ACI) for an articular cartilage defect of the distal femoral condyle.

Materials and Methods

Twenty four cases with an articular cartilage defect (Outerbridge grade IV) of the femoral condyle that was confirmed by MRI and the arthroscopic findings underwent ACI. Their mean age at the time of surgery was 42.8 years and the mean follow-up period was 53.2 months (range, 20-82 months). At the last follow up, the articular cartilage view (SPGR) of MRI was examined and the clinical results were evaluated using the HSS and Lysholm scores. In 8 cases, second-look arthroscopy and biopsy were performed and evaluated using histological and histochemical methods.

Results

All cases except for one showed well-regenerated articular cartilage on MRI. All cases showed significant clinical improvement in the HSS and Lysholm scores (p<0.0001), with the exception of the Lysholm score of an articular cartilage fracture. Histologically, the regenerated tissue appeared to be a hyaline-like cartilage in all specimens.

Conclusion

ACI for the treatment of articular cartilage defects of the distal femoral condyle showed a good clinical and MRI results. In OA, the clinical results were relatively acceptable after an associated high tibial valgus osteotomy. However, a longer term follow-up study will be needed to reach a final conclusion.

Figures and Tables

Fig. 1
A gel type cultured chondrocyte was put on the articular cartilage defect of the MFC (A) and was covered with periosteum and sutured to the articular cartilage with 6-0 prolene (B) in the left knee of 59 years old male.
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Fig. 2
(A) Histogram showing the mean HSS score of OA, OCD and articular cartilage fracture group checked preoperatively and at the last follow-up, respectively. In OA, OCD and articular cartilage fracture group, the HSS scores at the last follow-up were significantly improved than preoperative condition (p<0.0001). (B) Histogram showing the mean Lysholm score of OA, OCD and articular cartilage fracture group checked at preoperative and at the last follow-up, respectively. In OA and OCD, the Lysholm scores at the last follow-up were significantly improved than preoperative condition (p<0.0001). In articular cartilage fracture group, the score was not significantly different between the preoperative and the final follow-up condition (p=0.1257).
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Fig. 3
A second look arthroscopic biopsy specimen in the left knee of 54 years old female osteoarthritic knee in 3 years and 2 months after operation. Biopsy specimen with 3 mm diameter Turkel needle from the ACI site of medial femoral condyle with close up view of the biopsy site (lower inset). Biopsy specimen at ACI site showed thicker articular cartilage (upper insert A) than normal articular cartilage of the lateral femoral condyle (upper insert B).
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Fig. 4
Staining of the same specimen shows viable chondrocytes in lacunae with a uniform matrix. (A) The red color of the superficial layer of the biopsy specimen is thinner than the control specimen on safranin-O staining (×40). (B) The Masson's trichrome stain of the biopsy specimen shows a typical distribution of collagen fibers (×40). (C) Immunohistochemical staining for type II collagen shows that the positivity is evenly & diffusely extended to whole layer of the extracellular matrix (×40).
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Fig. 5
MRIs of the MFC of the right OA knee of 59 years old man shows full thickness defect of articular cartilage, preoperatively (A-1) and successful repair (A-2). MRIs of the MFC of the right OCD knee of 20 years old man shows full thickness defect of articular cartilage, preoperatively (B-1) and successful repair at final follow-up (B-2). MRIs of the injured MFC of the right knee of 25 years old man shows full thickness defect of the articular cartilage (C-1) and successful repair at final follow- up (C-2).
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Table 1
Demographic Data
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*MFC, medial femoral condyle; LFC, lateral femoral condyle; Preoperative cartilage defect, Outerbridge grade.

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