Feeling a pain in the low back, near the sacrum? Struggling to put weight on one leg? Experiencing discomfort while hiking, walking long distances, or climbing stairs? These symptoms could be signs of sacroiliac (SI) joint dysfunction. “In dancers, that area does take a pounding, and it can definitely be a pain generator more often than in the general public,” says Barry Sigrist, co-director of Production Physiotherapy, a UK-based physical therapy practice specializing in treating performers.