Xirmooyinka jilibka ee X4 ayaa loo isticmaalaa si loo baabi'iyo cabashooyinka bukaanka ee ku saabsan kala-goysyada jilibka oo shaqeynaya ama cabbir ahaan qalloocan, ka sokow bukaannada tayada nolosha hoos u dhacday ee uu keeno xanuunka la xiriira arthrosis.Qalabka wadajirka ah ee jilibka ayaa ka kooban qaybaha soo socda;Qaybaha femoral, gelinnada, qaybaha tibial, afkoda, biinanka, nuts, qaybaha patellar.