Question: what kind of joint is the radioulnar joint
[{'answer': 'load - bearing joint', 'provenance': [{'wikipedia_id': '5392116', 'title': 'Distal radioulnar articulation', 'start_paragraph_id': 9, 'start_character': 166, 'end_paragraph_id': 9, 'end_character': 185, 'bleu_score': 1.0, 'section': 'Section::::Function.\n'}]}, {'provenance': [{'wikipedia_id': '5392116', 'title': 'Distal radioulnar articulation', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 632, 'bleu_score': 0.979484453366057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7775628338546541504}, 'section': 'Section::::Function.\n'}]}]