It creates an attachment point for the ligamentum patellae, or patellar ligament. The patellae of the palps and legs have spines. This rule has greatly helped to reduce the incidence of luxating patellae in the breed. The female is uniformly dark brown apart from paler coxae and patellae. Chondromalacia patellae is a term sometimes used synonymously with PFPS. Lateral knee radiography can show multi-layered patellae. The patellae are counted in the total, as they are constant. "Chondromalacia patellae" is sometimes used synonymously with patellofemoral pain syndrome.