Surface marking is the method of locating and describing deeper anatomical structures by using visible or palpable landmarks on the body. It helps a physiotherapist communicate precisely, plan an examination, place measurement points, describe pain or swelling, identify muscle and joint relationships, and recognise when a finding needs medical referral.
Important limitation
Surface landmarks are guides, not proof of what lies underneath. Body size, age, posture, pregnancy, obesity, injury, oedema, deformity and anatomical variation can change the relationship. Use gentle examination, compare sides, respect privacy and confirm uncertain or high-risk findings through the responsible clinician and appropriate imaging or testing.
Learning outcomes
- Define surface anatomy, surface marking, anatomical landmark and line of reference.
- Apply anatomical position, planes, directions, regions and movement terminology.
- Locate major bony, muscular, vascular and visceral surface landmarks.
- Use safe inspection, palpation and measurement techniques in physiotherapy assessment.
- Describe findings clearly using reproducible landmarks rather than vague terms.
- Recognise limitations, red flags and situations requiring referral or imaging.
1. Basic principles of surface marking
Surface marking translates three-dimensional anatomy into reproducible points, lines, borders and regions on the living body. A good landmark is relatively constant, palpable, easy to describe and clinically useful.
1.1 The anatomical position
The reference position is standing upright, head and eyes forward, arms beside the body, palms facing forward, thumbs pointing laterally and feet directed forward. Descriptions are made from the patient’s right and left, not the observer’s. Document the patient’s position because landmarks shift between standing, sitting, supine, prone and side-lying.
1.2 Directional terms
| Term | Meaning | Example |
|---|---|---|
| Superior/inferior | Towards the head/away from the head | The sternum is superior to the umbilicus. |
| Anterior/posterior | Towards the front/towards the back | The patella is anterior to the knee joint. |
| Medial/lateral | Towards/farther from the midline | The sternum is medial to the ribs. |
| Proximal/distal | Nearer/farther from a limb’s attachment | The elbow is proximal to the wrist. |
| Superficial/deep | Nearer/farther from the body surface | Skin is superficial to muscle. |
| Ipsilateral/contralateral | Same side/opposite side | Right hip and right knee are ipsilateral. |
| Palmar/dorsal | Palm/back of the hand | The palmar surface faces anteriorly in anatomical position. |
| Plantar/dorsal | Sole/top of the foot | The plantar surface contacts the ground in standing. |
1.3 Planes, axes and common movements
| Plane/axis | Typical movement or use |
|---|---|
| Sagittal plane / mediolateral axis | Flexion and extension; side-view posture and range measurement. |
| Frontal (coronal) plane / anteroposterior axis | Abduction, adduction and lateral flexion; pelvic and shoulder alignment. |
| Transverse (horizontal) plane / vertical axis | Rotation; trunk, cervical and limb rotational assessment. |
| Oblique plane | Movement or imaging that follows a diagonal orientation. |
2. Safe surface-marking technique
- Explain and obtain consent: describe what you need to see, touch or measure and why. Offer a chaperone for sensitive areas.
- Prepare the environment: privacy, adequate light, comfortable temperature, clean hands and appropriate draping.
- Position the patient: document standing, sitting, supine, prone or side-lying; relax the muscles unless a contraction is being assessed.
- Inspect before palpating: note symmetry, swelling, colour, scars, deformity, muscle bulk, posture and movement.
- Palpate gently: use the pads of fingers, move from familiar structures to less familiar ones and ask about pain before increasing pressure.
- Confirm the landmark: compare with the opposite side, follow the structure along its contour and check the expected movement or relationship.
- Mark or measure only when appropriate: use a skin-safe marker, tape or goniometer according to policy; never mark broken or infected skin.
- Document precisely: side, position, landmark, distance/angle, symptom response, measurement method and time.
- Clean up and reassess: remove markings, restore dignity and report unexpected findings.
Palpation safety
Do not force a painful or unstable region. Use caution with suspected fracture, acute inflammation, vascular compromise, deep-vein thrombosis, open wound, recent surgery, severe osteoporosis or altered sensation. If palpation produces severe pain, neurological symptoms, faintness or unexpected swelling, stop and escalate.
3. Head and neck landmarks
| Landmark | How to locate | Physiotherapy/clinical use |
|---|---|---|
| External occipital protuberance | Prominence in the midline of the posterior skull. | Reference for the occiput, neck posture and suboccipital region. |
| Mastoid process | Bony prominence behind the ear. | Temporal-region orientation and attachment area for sternocleidomastoid. |
| Mandible and angle of mandible | Trace the lower jaw to its posterior angle. | Jaw movement, facial pain and head/neck orientation. |
| Hyoid bone | Small mobile bone in the anterior neck, usually near C3; palpate gently. | Swallowing, laryngeal movement and suprahyoid/infrahyoid relationships. |
| Thyroid cartilage | Laryngeal prominence in the midline, usually near C4–C5. | Airway/neck orientation; avoid forceful pressure. |
| Cricoid cartilage | Firm ring below thyroid cartilage, around C6. | Airway reference; never use surface marking as a substitute for trained airway procedures. |
| Clavicle | Palpate from the sternum to the acromion. | Shoulder girdle alignment and clavicular fracture assessment. |
| Spinous process of C7 | Most prominent cervical spinous process when the neck flexes. | Posture, cervical–thoracic junction and spinal measurement reference. |
| Sternocleidomastoid borders | From mastoid to sternum and medial clavicle; ask the patient to rotate the head against light resistance. | Neck posture, muscle length and torticollis assessment. |
4. Thoracic surface marking
4.1 Thoracic lines
- Midsternal line: vertical line through the centre of the sternum.
- Midclavicular line: vertical line through the midpoint of the clavicle; do not assume the nipple is a reliable landmark for every person.
- Anterior, mid and posterior axillary lines: reference the front, centre and back of the axillary fold.
- Scapular and paravertebral lines: pass through the inferior angle/medial spinal region and beside the vertebral column.
4.2 Bony landmarks and clinical relationships
| Landmark | Approximate relationship/use |
|---|---|
| Jugular (suprasternal) notch | Superior border of the manubrium; reference for the upper sternum and clavicles. |
| Sternal angle (angle of Louis) | Manubriosternal junction, approximately T4/T5; level of the second costal cartilage and division of the trachea in standard anatomy. |
| Rib and intercostal spaces | Count from the second rib at the sternal angle; palpate gently and avoid pressing directly over painful ribs. |
| Xiphoid process | Inferior sternum; variable in shape, so avoid deep pressure. |
| Scapula | Spine commonly near T3; inferior angle often near T7 at rest, but position changes with arm movement. |
| Diaphragm/lung bases | Levels vary with breathing, posture and body habitus; do not use a single surface estimate as a diagnosis. |
For respiratory assessment, describe findings by side, line and level—for example, “reduced expansion at the right lower posterior chest”—rather than “reduced chest movement.” Use auscultation and medical assessment according to your training and scope.
5. Abdominal surface marking
5.1 Four quadrants
| Quadrant | Structures commonly projected here | Clinical use |
|---|---|---|
| Right upper quadrant | Liver, gallbladder, duodenum, head of pancreas, right kidney and colon. | Describe pain, tenderness, scars or swelling accurately. |
| Left upper quadrant | Stomach, spleen, body/tail of pancreas, left kidney and colon. | Relevant to abdominal, splenic and rib-related symptoms. |
| Right lower quadrant | Caecum, appendix region, terminal ileum, right ureter and reproductive structures. | Report localised pain or guarding promptly. |
| Left lower quadrant | Descending/sigmoid colon, left ureter and reproductive structures. | Document bowel, pelvic and musculoskeletal symptoms by side. |
5.2 Nine abdominal regions
Two vertical midclavicular lines and two horizontal planes divide the abdomen into:
| Right | Middle | Left |
|---|---|---|
| Right hypochondriac | Epigastric | Left hypochondriac |
| Right lumbar | Umbilical | Left lumbar |
| Right iliac/inguinal | Hypogastric/pubic | Left iliac/inguinal |
Important horizontal references include the subcostal plane and transtubercular plane; their exact levels vary with body shape. The transpyloric plane is a useful upper-abdominal reference but should be treated as approximate.
5.3 Abdominal and pelvic landmarks
- Umbilicus: visible central reference; level changes with age, body shape and pregnancy.
- Anterior superior iliac spine (ASIS): prominent anterior pelvic point for leg-length, pelvic alignment and muscle attachment references.
- Posterior superior iliac spine (PSIS): palpable posterior pelvic point, often near the dimples above the buttocks.
- Iliac crest: superior border of the pelvis; the line between the highest points often approximates L4/L4–L5, but individual variation exists.
- Pubic symphysis: anterior midline pelvic joint; assess respectfully and only when clinically indicated.
- Inguinal ligament region: runs approximately from ASIS to pubic tubercle; avoid aggressive pressure over vessels and sensitive structures.
6. Spine and posterior trunk
| Landmark | Location/relationship | Use |
|---|---|---|
| C7 spinous process | Prominent at the cervicothoracic junction during neck flexion. | Posture and spinal alignment measurements. |
| Scapular spine | Often near T3 at rest. | Scapular position and thoracic posture. |
| Inferior angle of scapula | Often near T7 at rest, moving with arm elevation. | Scapulohumeral rhythm and thoracic reference. |
| 12th rib | Lowest rib; posteriorly related to the upper lumbar region. | Kidney/flank orientation; palpate carefully. |
| L4 spinous process/iliac crest line | Intercristal line is an approximate lumbar reference. | Spinal examination and safe measurement—not a substitute for imaging. |
| Sacrum and PSIS | Posterior midline triangular bone and paired pelvic points. | Pelvic tilt, sacroiliac-region assessment and movement analysis. |
Palpate spinal processes in a relaxed position and avoid interpreting tenderness alone as the source of pain. Consider movement, neurological findings, red flags, history and functional impact.
7. Upper-limb surface landmarks
| Region | Landmarks and use |
|---|---|
| Shoulder girdle | Acromion, coracoid process, clavicle, spine and inferior angle of scapula. Use for posture, scapular movement and shoulder range. |
| Arm and elbow | Medial/lateral epicondyles, olecranon and radial head. Use for elbow axis, muscle/tendon attachment and alignment. |
| Forearm and wrist | Radial/ulnar shafts and styloid processes; identify the radial pulse on the thumb side. |
| Hand | Metacarpal heads, MCP/PIP/DIP joints, anatomical snuffbox and thenar/hypothenar eminences. |
| Vascular/nerve caution | Do not compress a painful swelling, suspected fracture or neurovascular structure. Check colour, warmth, sensation, capillary refill and pulse when indicated. |
8. Lower-limb surface landmarks
| Landmark | How it helps assessment |
|---|---|
| ASIS and greater trochanter | Pelvic alignment, hip position, apparent leg-length and muscle attachment references. |
| Patella and patellar tendon | Knee alignment, tracking and quadriceps/extensor mechanism assessment. |
| Tibial tuberosity and tibial crest | Anterior knee reference and lower-leg alignment. |
| Head of fibula | Lateral knee landmark; protect the common fibular nerve around the neck. |
| Medial/lateral malleoli | Ankle mortise, swelling and ligament region assessment. |
| Navicular, base of fifth metatarsal and metatarsal heads | Foot posture, arch, loading and footwear assessment. |
| Calcaneus and Achilles tendon | Heel alignment, tendon continuity and push-off function. |
| Dorsalis pedis/posterior tibial pulses | Peripheral circulation screening when trained and indicated; compare sides and report abnormal findings. |
9. Surface marking for movement and measurement
- Goniometry: align the fulcrum over the joint axis and the arms with reproducible proximal and distal landmarks; record position, side and method.
- Manual muscle testing: stabilise the correct segment and apply resistance at a consistent lever arm while protecting painful or healing tissues.
- Gait and posture analysis: use landmarks such as ASIS, PSIS, greater trochanter, knee joint line, malleoli and scapular points; document footwear and surface.
- Chest expansion: place a tape at a consistent level and record breathing instruction, position and measurement difference.
- Swelling measurement: mark identical distances from fixed landmarks, use the same tape tension and compare with the opposite side when appropriate.
- Palpation of muscle/tendon: ask the patient to perform a gentle contraction or movement to confirm the structure, without provoking injury.
Scenario: locating a knee pain site
Instead of recording “pain around the knee,” identify the side and relationship: anterior joint line, medial tibial plateau, patellar tendon, fibular head or posterior crease. Record the movement or load that reproduces symptoms, swelling, range, neurovascular status and functional limitation. This makes communication and follow-up more reliable.
10. Common errors and how to prevent them
| Error | Why it causes problems | Better practice |
|---|---|---|
| Using the observer’s left/right | Creates wrong-side documentation. | Use the patient’s right and left consistently. |
| Palpating without consent or warning | Causes distress and breaches dignity. | Explain, obtain consent, drape and use a chaperone where appropriate. |
| Assuming a landmark is fixed | Posture, body habitus and movement change relationships. | Record position and confirm with more than one reference. |
| Pressing over an acute injury | May worsen pain or damage tissue. | Screen history, observe first and use gentle technique/referral. |
| Marking infected or broken skin | Can spread infection or injure tissue. | Use alternative references and follow infection-prevention policy. |
| Confusing surface projection with diagnosis | Different organs and tissues can refer pain to the same area. | Integrate history, examination, vital signs and medical investigations. |
| Not documenting the method | Measurements cannot be reproduced. | Record landmark, position, instrument, side, angle/distance and response. |
11. Red flags during surface examination
- Unexplained severe or night pain, fever, weight loss or rapidly progressive symptoms.
- New neurological weakness, loss of sensation, saddle symptoms or bladder/bowel change.
- Acute limb swelling, warmth, redness, disproportionate pain or sudden breathlessness.
- Suspected fracture, deformity, dislocation or inability to bear weight after trauma.
- New chest pain, fainting, cyanosis or severe respiratory distress.
- Abdominal guarding, rigid abdomen, persistent vomiting, gastrointestinal bleeding or sudden severe pain.
Stop the examination, keep the patient safe and activate the appropriate clinical pathway. Do not continue repeated palpation to “find the exact spot” when a red flag is present.
12. Practical learning activities
- On a classmate who has given consent, identify C7, the scapular spine, inferior angle, ASIS, PSIS, greater trochanter, patella, tibial tuberosity and malleoli.
- Draw the four abdominal quadrants and nine regions, then list two projected organs in each.
- Practise describing the same shoulder finding in standing and supine positions, noting what changes.
- Perform a mock goniometric measurement with a standardised position and document side, landmarks and angle.
- Role-play a patient who develops pain during palpation: practise stopping, explaining, reassessing and escalating.
13. Examination points and revision questions
High-yield points
- Surface marking uses visible or palpable landmarks to describe deeper structures.
- Always use the patient’s right and left and record the patient’s position.
- The sternal angle helps identify the second rib; the iliac crest line is an approximate lumbar reference.
- ASIS, PSIS, greater trochanter, patella, malleoli and scapular landmarks are essential in movement assessment.
- Landmarks guide examination but do not replace imaging or clinical reasoning.
- Consent, privacy, gentle palpation and reproducible documentation are essential professional behaviours.
- Define surface anatomy and explain four reasons it is important in physiotherapy.
- Describe the anatomical position, planes and directional terms used in surface marking.
- Locate and explain the clinical importance of C7, the sternal angle, ASIS, PSIS and the iliac crest.
- Describe the four abdominal quadrants and nine abdominal regions.
- Explain how to perform safe palpation and document a landmark-based finding.
- List six common errors in surface marking and how to prevent them.
- Give six red flags that should stop a surface examination and prompt referral.
References for further study
- OpenStax: Anatomical terminology and planes
- OpenStax: Bone structure and surface markings
- NCBI/PubMed: Angle of Louis as an anatomical landmark
- NCBI Bookshelf: Neck triangles and surface anatomy
- NCBI Bookshelf: Anatomical snuffbox and palpable landmarks
- WHO: Rehabilitation
Educational note: Surface marking is a supervised practical skill. Follow local examination, consent, infection-prevention, safeguarding and referral policies.