The illustration shows various types of fracture. Select the one that depicts a greenstick fracture.

Choice A reason: Osteoporosis causes bone density loss, leading to fractures, not primary joint pain. Pain occurs secondary to fractures, not joint inflammation or degeneration. This condition is the least likely to cause joint pain directly, as its pathology focuses on bone fragility rather than synovial or cartilage issues.

Choice B reason: Systemic lupus erythematosus (SLE) causes joint pain due to autoimmune-mediated synovitis, affecting multiple joints symmetrically. Inflammatory cytokines drive pain and swelling, making SLE a common cause of joint pain, unlike osteoporosis, which primarily affects bone structure without direct joint involvement.

Choice C reason: Osteoarthritis causes joint pain due to cartilage degeneration and bone-on-bone friction, particularly in weight-bearing joints like knees. Mechanical stress and inflammation contribute to chronic pain, making osteoarthritis a frequent cause of joint pain, unlike osteoporosis, which lacks primary joint pathology.

Choice D reason: Rheumatoid arthritis causes significant joint pain through autoimmune synovial inflammation, leading to swelling, stiffness, and cartilage damage. This systemic condition affects multiple joints, making it a primary cause of joint pain, unlike osteoporosis, which is associated with bone loss, not joint inflammation.

Choice A reason: Undisplaced fractures, where bone segments remain aligned, heal faster, typically in 6-8 weeks. Minimal disruption to blood supply and periosteum allows efficient callus formation and remodeling. These fractures require less intervention, as the stable bone structure supports osteoblast activity and collagen deposition, leading to quicker recovery.

Choice B reason: Compound (open) fractures, where bone pierces the skin, take the longest to heal, often 3-6 months or more. Open wounds increase infection risk, disrupting blood supply and delaying osteogenesis. Surgical intervention, prolonged immobilization, and potential complications like osteomyelitis further slow the healing process, requiring extensive tissue repair.

Choice C reason: Greenstick fractures, common in children, involve partial bone breaks due to flexible bones. They heal relatively quickly, in 4-8 weeks, as the intact periosteum supports rapid callus formation. The partial break preserves some blood supply, facilitating osteoblast activity and bone remodeling, making healing faster than compound fractures.

Choice D reason: Oblique fractures, with angled breaks, heal in 6-12 weeks, depending on stability. While more complex than undisplaced fractures, they have less soft tissue damage than compound fractures. Blood supply disruption is moderate, and surgical fixation may be needed, but healing is faster than in open fractures due to lower infection risk.