The Role of Physical Therapy in Patients with Metastatic Disease to Bone

Abstract

The American Cancer Society estimates that in 1991 over seven million Americans were alive despite a diagnosis of cancer.¹ As the medical community becomes more successful in prolonging the lives of cancer patients, a significant number will experience the resultant disability of cancer and its treatment. Those with advanced disease may find the quality of their lives to be profoundly compromised. The role of rehabilitation with the latter population is to maximize the patients' functional capabilities and to conserve their limited energy reserves. Clearly, quality of life is an overriding issue fix this population.

The development of bony metastases is devastating for the cancer patient and presents a considerable challenge for the physical therapist. Approximately 50% of patients with breast, lung, or prostate cancer will develop bony metastases. Less common, though equally problematic, are bone metastases in patients with carcinoma of the kidney, pancreas, bladder, thyroid, and cervix.

Patients with advanced disease present a complex clinical picture. It is imperative that the physical therapist consult and confer regularly with the oncologist, physiatrist, and/or orthopedist to remain abreast of the patient's changing clinical picture. Information vital to safe and effective rehabilitation includes the presence, location, and extent of bony metastases, involvement of bone marrow potentiating refractory pancytopenia, infection, and hypercalcemia secondary to prolonged immobility.

In patients with metastatic disease to bone, it is not sufficient to rely solely on plain X-ray findings. Plain radiographs will not detect bone lesions unless a sufficient amount of matrix is destroyed (30–50% of bone matrix must be involved to be visualized). Bone scan results should be assessed prior to establishing a rehabilitation program for most cancer patients. Patients with advanced disease frequently present with pain, neurologic deficits, impending or pathologic fractures, and generalized weakness associated with prolonged immobility. Any new complaints of pain, or findings of progressive weakness should be discussed with the patient's physician in order to initiate an appropriate work-up.