To the Editor: Brittberg et al. (Oct. 6 issue)1 are to be commendedfor conducting a study of 23 patients that not only involvedthe transfer of articular and nonarticular tissue into deepcartilage defects in the knee but also required two follow-upoperations. In the second of those procedures, biopsy specimensextending to the subchondral bone were taken from the centralpart of the transplant.
In consideration of these factors, it is perhaps understandablethat no control group was included in the study. Nevertheless,it would have been nice to know just how much benefit was derivedfrom the . . . [Full Text of this Article]
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