 his statement they are not completely submerged in the bone. perhaps it may be thought from this that they have some degree of submersion in the bone but that is not the case. rather they do not have any degree of submersion so as not to prevent their opening. that nullifies their benefit that we mentioned. there is no other joint in the body like them. and god knows best.
قوله وليسا بغائصين في العظم تمام الغوص، وربما توهم من هذا أن لهما غوصا ما في العظم، وليس كذلك وإنما لم يكن لهما غوص ما لئلا يمنع انفتاحهما. وذلك مبطل لفائدتهما التي ذكرناها. وليس يوجد في البدن مفصل آخر مثلهما. والله أعلم.