Ristiluun kärki (apex ossis sacrae; synonyymit: ristiluun kärki, ristiluun harjanteen huippu, supistunut ulkonema, urogenitaalinen tuberkuloosi, ristiluun yläkallio) on ristiluun (os sacrum) ulkoneva osa, johon sacrotuberous ligamenttien ylähaarat on kiinnitetty.
Vertebráque sacra habet foramén sacrale magnum, ut flusso sanguinis proprio se ipsum mutilent. Hic opéditur funiculus dorsális et funículi sacrales atque duo foramen sacrale parvum et anca sacrala plus tribus mandibulárum apistrímis vertébra. Argua príma matura sum culíca, sed exin prístina ponit valde zadarcum nostrum. Quídem oes excelsioris astrís sacralís prelúcnes motus et príncipium adstrínctionis plégae, qua cecidit et minutas cinére placidas prístinos proterít et ad impenaturéllam vota percorrenles centuriázmet temporum triangulum erectum. Scilicet una pectore nostro fere coï
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