What does "德国骨科" mean?

解释：兄妹/姐弟不伦 来源：传闻是某位汉化组的哥们推了自己的妹妹（有血缘关系），然后被父亲发现，打断了腿，然后去德国看了骨科。 后据传，该少年已经和自己的妹妹在国外领证，并且两人过上了没羞没臊令人羡慕的生活。 此后，德国骨科作为一个梗流传了下来，用来警（调）示（侃）那些对和自己有血缘关系的妹妹抱有一些想法的绅士（们）

ENExplanation: Incest between brother and sister. Origin: It is rumored that a guy from a translation group had sex with his own sister (blood-related), was discovered by his father, who broke his leg, and then went to Germany for orthopedic treatment. It is later rumored that the young man has already married his sister abroad, and the two are living a shameless and enviable life. Since then, 'German orthopedics' has been passed down as a meme to warn (or tease) those gentlemen who have some ideas about their blood-related sisters.