The Lachman Test is a hands-on physical exam maneuver used to assess the anterior cruciate ligament (ACL) in the knee. It is a **clinical test** (not an imaging study) that evaluates how the tibia moves relative to the femur. It is commonly used in sports medicine, orthopedics, emergency care, and physical therapy settings. Its findings help clinicians judge whether an ACL injury is likely and how unstable the knee may be.

An Instability Test is a clinical examination maneuver used to assess whether a joint is abnormally loose or shifts out of normal alignment. It is a **test** performed during the musculoskeletal physical exam. It is commonly used in orthopedics, sports medicine, emergency care, and rehabilitation settings. It helps clinicians connect symptoms (pain, “giving way,” clicking) with potential ligament, labral, capsular, or bony injury.

Ecchymosis is a visible skin discoloration caused by blood leaking into the soft tissues. It is a clinical concept and physical exam finding rather than a disease or procedure. In practice, Ecchymosis is commonly used to describe bruising patterns seen after injury or surgery. It is frequently referenced in orthopedic and trauma assessments to help localize and contextualize tissue damage.

Bruising is visible skin discoloration caused by bleeding into soft tissues. Bruising is a clinical sign and concept rather than a single diagnosis. Bruising is commonly discussed in orthopedics after trauma, sports injuries, and surgery. Bruising can also be a clue to bleeding disorders, medication effects, or deeper injury.

Swelling is an increase in visible or measurable tissue volume in a body region. It is a clinical **concept/sign**, not a single diagnosis. In musculoskeletal and orthopedic practice, Swelling is commonly assessed around joints and soft tissues after injury, overuse, or systemic illness. It is used in history, physical exam, and imaging interpretation to narrow the differential diagnosis and track change over time.

Tenderness is pain or discomfort that is provoked or worsened when an area is touched or pressed. It is a clinical concept and a physical examination finding rather than a diagnosis by itself. Tenderness is commonly used in orthopedic and musculoskeletal practice to help localize pathology. It is documented during history-taking and palpation to support clinical reasoning and triage.

A Pain Scale is a standardized way to describe and record pain. It is a clinical concept and assessment tool rather than an anatomy structure or a treatment. It is commonly used during orthopedic history-taking, inpatient monitoring, and rehabilitation follow-up. It helps clinicians communicate about pain in a consistent, trackable format.

Orthopedic Assessment is a structured clinical evaluation of the musculoskeletal system. It is a clinical concept that combines history, physical examination, and selective diagnostic testing. It is commonly used in orthopedic clinics, emergency and urgent care settings, sports medicine, and rehabilitation. It helps clinicians connect symptoms to anatomy, biomechanics, and likely pathology.

Stem Cell Therapy is a treatment concept that uses living cells with regenerative and immunomodulatory potential. Stem Cell Therapy is best classified as a **procedure and biologic intervention**, not a single standardized product. In musculoskeletal practice, it is most often discussed for **degenerative joint disease** and **tendon/ligament conditions**. It is also referenced in orthopedic research and sports medicine as a potential tool for tissue repair.

PRP Therapy is a treatment that uses a patient’s own blood components to create a platelet-concentrated injectate. It is best categorized as a procedure and biologic injection technique rather than a medication. It is commonly used in orthopedics and sports medicine for selected tendon, ligament, muscle, and joint conditions. It is discussed as an adjunct to rehabilitation, not a replacement for diagnosis and staged care.