Left Knee Pain with Numbness and Tingling Without Back Pain

Critical First Step: Rule Out Referred Pain

The American College of Physicians recommends evaluating for lumbar spine pathology, as it can present with knee symptoms alone, particularly when radiographs are unremarkable 1
The American Academy of Orthopaedic Surgeons suggests evaluating for hip pathology, as it commonly refers pain to the knee and should be evaluated if knee imaging is normal 1
A thorough clinical examination of the lumbar spine and hip should be performed before knee-focused imaging, as recommended by the American College of Physicians 1, 2

Occlusive disease in tibial arteries produces calf pain or, more rarely, foot pain and numbness, according to the American Heart Association 3
Exercise-induced symptoms that resolve with rest suggest vascular claudication, as stated by the American Heart Association 3
Diminished pulses in femoral, popliteal, posterior tibial, and dorsalis pedis arteries should be looked for, as recommended by the American Heart Association 3
Femoral bruits may indicate systemic atherosclerosis, according to the American Heart Association 3

The American College of Cardiology recommends checking all lower extremity pulses bilaterally 3
Assessing for femoral bruits is suggested by the American Heart Association 3
Examine hip range of motion and perform hip provocation tests, as recommended by the American Academy of Orthopaedic Surgeons 1
Perform lumbar spine examination including straight leg raise, as suggested by the American College of Physicians 1

Initial radiographs should be reserved for chronic knee pain, suspected fracture, or degenerative changes, according to the American College of Radiology 4
MRI should only be performed when surgery is considered, pain persists despite conservative treatment, or radiographs are normal but symptoms persist, as recommended by the American College of Radiology 4
If knee imaging is unremarkable and clinical evidence suggests spinal origin, image lumbar spine, as suggested by the American College of Physicians 1
Consider hip imaging if knee evaluation is normal, as recommended by the American Academy of Orthopaedic Surgeons 1

Comprehensive risk factor modification and antiplatelet therapy are recommended for peripheral arterial disease by the American Heart Association 3
Consider revascularization if significant disability is present and anatomy is favorable, as suggested by the American Heart Association 3

Not all structural abnormalities are symptomatic, particularly in patients over 45 years, according to the American College of Physicians 1
Premature MRI should be avoided, as approximately 20% of chronic knee pain patients undergo MRI without recent radiographs, as stated by the American College of Physicians 1
Radiographs may be initially normal in subchondral insufficiency fractures, as suggested by the American College of Radiology 1