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 3x9 Other derangements of patella, unspecified knee
 * M22.4 Chondromalacia patellae
 * M22.40 Chondromalacia patellae, unspecified knee
 * M22.41 Chondromalacia patellae, right knee
 * M22.42 Chondromalacia patellae, left knee
 * M22.8 Other disorders of patella
 * M22.8x Other disorders of patella
 * M22.8x1 Other disorders of patella, right knee
 * M22.8x2 Other disorders of patella, left knee
 * M22.8x9 Other disorders of patella, unspecified knee
 * M22.9 Unspecified disorder of patella
 * M22.90 Unspecified disorder of patella, unspecified knee
 * M22.91 Unspecified disorder of patella, right knee
 * M22.92 Unspecified disorder of patella, left knee

M23 Internal derangement of knee

 * Excludes1: ankylosis (M24.66)
 * current injury - see injury of knee and lower leg (S80-S89)
 * deformity of knee (M21.-)
 * osteochondritis dissecans (M93.2)
 * recurrent dislocation or subluxation of joints (M24.4)
 * recurrent dislocation or subluxation of patella (M22.0-M22.1)
 * M23.0 Cystic meniscus
 * M23.00 Cystic meniscus, unspecified meniscus
 * Cystic meniscus, unspecified lateral meniscus
 * Cystic meniscus, unspecified medial meniscus
 * M23.000 Cystic meniscus, unspecified lateral meniscus, right knee
 * M23.001 Cystic meniscus, unspecified lateral meniscus, left knee
 * M23.002 Cystic meniscus, unspecified lateral meniscus, unspecified knee
 * M23.003 Cystic meniscus, unspecified medial meniscus, right knee
 * M23.004 Cystic meniscus, unspecified medial meniscus, left knee
 * M23.005 Cystic meniscus, unspecified medial meniscus, unspecified knee
 * M23.006 Cystic meniscus, unspecified meniscus, right knee
 * M23.007 Cystic meniscus, unspecified meniscus, left knee
 * M23.009 Cystic meniscus, unspecified meniscus, unspecified knee
 * M23.01 Cystic meniscus, anterior horn of medial meniscus
 * M23.