translate English to French:   His patellae measure 6 cm x 5 cm, are of normal height   and of normal ratio between the length of the patella   - 13 - and that of the infra patellar tendon.
  His patellae measure 6 cm x 5 cm, are of normal height   and of normal ratio between the length of the patella   and that of the infra patellar tendon.