Cancer — Musculoskeletal — Precision Clinical Education

Pathophysiology

Osteosarcoma: Most common primary bone cancer. Typically near growth plates (distal femur, proximal tibia, proximal humerus). Affects adolescents during growth spurt. Metastasizes readily to lungs
Ewing sarcoma: Undifferentiated tumor of neural crest origin. Found in diaphysis of femur or pelvis. Usually children/young adults
Chondrosarcoma: Malignant tumor of cartilage. Slow-growing. May remain hidden in pelvis. More common in adults (average age 51)
Synovial sarcoma: Originates in fascial compartments of extremities, often the lower leg
Metastatic bone disease: Secondary tumors from breast, prostate, lung, thyroid, or kidney cancers. Far more common than primary bone cancers
Night pain unrelated to injury is the hallmark clinical indicator that distinguishes malignant from benign MSK conditions

Deep, aching pain that may initially occur with activity but progresses to constant pain, frequently waking the patient at night
Palpable hard lump or enlargement of affected bone or tissue
Restricted ROM in adjacent joint or noticeable limp
Shiny, stretched, warm skin over bone with prominent superficial veins (high metabolic activity)
Constitutional signs: unexplained weight loss (>10 lbs in 2 weeks), persistent fatigue, fever

Night pain not relieved by rest, unrelated to injury: Classic red flag for malignancy
Pain not following typical orthopedic patterns: Raises suspicion for tumor involvement rather than MSK injury
Palpable hard, fixed lump on bone: Not consistent with typical MSK conditions — refer immediately
Shiny, stretched skin with prominent superficial veins: High metabolic activity from tumor growth
Inability to bear weight or perform normal ADLs: Risk of pathologic fracture where bone cannot withstand ordinary loading

Goal: Palliative care to alleviate pain, anxiety, depression, and improve sleep
Local contraindications: Strictly contraindicated over active tumor sites, undiagnosed lumps, or recent radiation areas
Bone fragility: Bones affected by cancer or metastasis are brittle and at high risk for pathologic fractures. Extreme caution with pressure and positioning
Lymphedema risk: MSK cancers often require lymph node dissection for staging, creating permanent lymphedema risk
Analgesic masking: Patients on strong analgesics or corticosteroids may have masked pain. Use conservative pressure
Psychosocial impact: Treatment often involves disfiguring surgery or amputation. Massage provides nurturing touch
Treatment side effects: See chemotherapy and radiation-therapy

Night pain not relieved by rest and unrelated to injury is a classic red flag for malignancy
Bone is the most common site for secondary metastasis from breast, thyroid, prostate, lung, and kidney cancers
Pain not following typical orthopedic patterns should raise suspicion for tumor involvement
Osteosarcoma typically occurs near growth plates in adolescents. Ewing sarcoma is in the diaphysis
Shiny, stretched skin with prominent superficial veins over bone suggests high metabolic activity

MSK cancers include primary sarcomas and metastatic bone disease from breast, prostate, lung, thyroid, or kidney cancers
Night pain not relieved by rest and unrelated to injury is the classic red flag for malignancy
Bones affected by cancer are brittle with high pathologic fracture risk. Pressure and positioning must be extremely conservative
Analgesic masking is a significant safety concern — patients may not feel when excessive pressure is applied
Osteosarcoma affects adolescents near growth plates and metastasizes readily to the lungs