Chapter 22: Lower Extremity Limb Pain Assessment

The text outlines a systematic approach to history taking, prioritizing the identification of urgent conditions such as compartment syndrome, acute limb ischemia, septic arthritis, and cauda equina syndrome, which require immediate surgical or vascular intervention to prevent permanent disability or amputation. A detailed guide to the physical examination is provided, covering the inspection of gait abnormalities like Trendelenburg, antalgic, and circumduction gaits, as well as the assessment of joint stability, effusion, and range of motion. The chapter explores a vast array of specific musculoskeletal pathologies, categorizing them by mechanism and location. This includes traumatic and overuse injuries such as anterior cruciate ligament (ACL) tears, medial collateral ligament (MCL) sprains, and meniscal tears, which are evaluated using specialized maneuvers like the Lachman, McMurray, and Thessaly tests. It also details overuse syndromes like plantar fasciitis, Achilles tendinitis, Osgood-Schlatter disease, and shin splints. Significant attention is given to inflammatory and degenerative conditions, distinguishing between osteoarthritis, rheumatoid arthritis, gout, and infectious processes like Lyme disease and osteomyelitis. Pediatric-specific diagnoses are thoroughly examined, differentiating benign conditions like growing pains from serious pathologies such as Slipped Capital Femoral Epiphysis (SCFE), Legg-Calve-Perthes disease (LCPD), and malignancies like osteosarcoma or neuroblastoma. Furthermore, the chapter addresses nerve entrapment syndromes, including tarsal tunnel syndrome and peroneal nerve compression, and discusses the role of diagnostic studies such as synovial fluid aspiration, inflammatory markers (ESR, CRP), and imaging modalities (X-ray, MRI) in confirming diagnoses. The content underscores the importance of evaluating the limb in the context of the whole patient, considering systemic contributors like diabetes, sickle cell disease, and psychosomatic factors.