Biomech Markerset

There are four different Biomech Markersets (Motive 1.9): Biomech (54), Biomech(49), Biomech Upper Body (27), and Biomech Lower Body (26). When attaching the markers, you should reference the skeleton avatar from the Skeleton Pane for relative locations. The following charts provide anatomical conventions as well as additional descriptions to where each marker should be place. Find respective markers from the chosen markerset and use the chart for more accurate placements.

For Motive 1.10 and above, Biomech Markersets have been replaced with Rizzoli Markerset. Only the Biomech Markerset (49) will be available. Please read more at Rizzoli Markerset.

List of Biomech Markersets

• Biomech (54) → Motive 1.10: Removed and replace with Rizzoli Markerset.

• Biomech (49) → Motive 1.10: Renamed to Biomech (57)

• Biomech Upper Body (27) → Motive 1.10: Removed and replace with Rizzoli Markerset.

• Biomech Lower Body (26) → Motive 1.10: Removed and replace with Rizzoli Markerset.

The anterior and posterior views of the Biomech Markerset (54). The calibration markers are highlighted in red.

Biomech Markers

Head Markers
Labels	Related Segment	Anatomical Location	Placement Description
LAH	Head	Left Anterior Head	Place the markers on the left and right side of the fore head. The respective location is shown in the skeleton figure.
RAH	Head	Right Anterior Head
LPH	Head	Left Posterior head	Place the markers on the left and right side of the head about 2 cm behind the ear. The respective location is shown in the skeleton figure.
RPH	Head	Right Posterior head

Torso Markers
Labels	Related Segment	Anatomical Location	Additional Description
SJN (IJ[1])	Thorax	Sternum Jugular Notch	Top most section of the sternum. Place the marker on the center of the two clavicle bones.
SXS (PX[1])	Thorax	Sternum Xiphoid Process	Lowest section of the sternum. Place the marker 1-2 cm above where bottom of the two rib cages conjoin.
CV7 (C7[1])	Thorax	Cervical Spine Vertebra 7	The 7th cervical spine vertebra is the largest vertebra located at the most inferior region of the neck. This section usually protrudes to the posterior side and can be palpated.
TV2 (T2[1])	Thorax	Thoracic Spine Vertebra 2	The second thoracic spine vertebra is located three spine levels below the C7 vertebra. Which is located approximately at same height with shoulder joint markers.
TV7 (T7[1])	Thorax	Thoracic Spine Vertebra 7	Usually located at the center of the thoracic spinal column.
LHGT	Upper Arm / Shoulder	Left Glenohumeral Joint	Place the marker on the posterior side of the shoulder axis. Ask the subject to posture in T-pose while placing the markers.
RHGT	Upper Arm /Shoulder	Right Glenohumeral Joint

Waist Markers
Note that the waist markers are the key markers in modeling the pelvis bone, which is the major segment governing the other subsequent skeleton segments.
Labels	Related Segment	Anatomical Location	Additional Description
LIAS (PSISl[2][1])	Pelvis	Left Iliac Anterior Spine	Place the marker on the protruding bones located on the left and right side of the pelvis front.
RIAS (PSIS[2][1])	Pelvis	Right Iliac Anterior Spine
LIPS (ASIS[2][1])	Pelvis	Left Iliac Posterior Spine	Place each marker on the two dimples which can be palpated near the spine right above the hips.
RIPS (ASIS[2][1])	Right Iliac Posterior Spine

Upper Extremity Markers
Labels	Related Segment	Anatomical Location	Placement Description
LCAJ (LA[1])	Thorax	Left Clavicle-Acromion Joint	Ask the subject to stretch both arms towards the side (T-pose), then palpate top of each shoulder for the protruding bone. The prominence is usually located at the end of the corresponding clavicle bone just before where the upper arm starts.
RCAJ (RA[1])	Thorax	Right Clavicle-Acromion Joint
LHLE	Upper Arm	Left Humerus Lateral Epicondyle	Placed the markers on the lateral side of the elbow axis. Flex and extend the arm few times to find where elbow axis is located.
RHLE	Upper Arm	Right Humerus Lateral Epicondyle
LHME*	Upper Arm	Left Humerus Medial Epicondyle	Place on the medial side of the elbow axis. Ask the subject to flex and extend the arm while placing the markers.
RHME*	Upper Arm	Right Humerus Medial Epicondyle
LUA	Upper Arm	Left Upper Arm	Ask the subject to stand in T-pose while placing the marker. Palpate to find the groove between the triceps muscles where skin movements are relatively minimal.
RUA	Upper Arm	Right Upper Arm

Hand Markers
For best results, place the three hand markers so the created shape is asymmetrical (avoid isosceles shape) and unique from the marker arrangements on the other hand. Since the wrist markers have defined placement — along the wrist axis — introduce small amount of positional offset to the LHM2 and RHM2 markers.
Labels	Related Segment	Anatomical Location	Placement Description
LHM2	Hand	Left Hand Second metatarsal	Place the marker slight below the knuckle of the index finger.
RHM2	Hand	Right Hand Second metatarsal
LUSP	Hand	Left Ulna Styloid Process	Place the marker on the lateral side of the wrist axis.
RUSP	Hand	Right Ulna Styloid Process
LRSP	Hand	Left Radius Styloid Process	Place the marker on the medial side of the wrist axis.
RRSP	Hand	Right Radius Styloid Process

Lower Extremity Markers
The joint center of the knee and the ankle is modeled at the midpoint of the lateral and medial joint markers (FLE/FME and FAL/TAM). Assuming that center of the femoral head aligns with the center of the acetabulum, its virtual location is modeled using markers on the pelvis segment (posterior and anterior iliac spine markers). The lower extremity segments are modeled along these three virtual locations.
Labels	Related Segment	Anatomical Location	Placement Description
LFTC (GT[2])	Pelvis	Left Femoral greater Trochanter	Place the markers on left and right side of the hip, where you can palpate the hip joint or the most lateral prominence of the greater trochanter.
RFTC (GT[2])	Right Femoral greater Trochanter
LFLE (LE[2])	Upper Leg	Left Femur Lateral Epicondyle	Place the marker on the lateral prominence of the knee joint axis. More specifically, the marker should be placed on the femur epicondyle. You may need to ask the subject to flex and extend the knee few times to locate the axis.
RFLE (LE[2])	Right Femur Lateral Epicondyle
LFME* (ME[2])	Upper Leg	Left Femur Medial Epicondyle	Place the marker on the Medial prominence of the knee joint axis. Ask the subject to flex and extend the knee few times to locate the knee axis.
RFME* (ME[2])	Right Femur Medial Epicondyle
LTH	Upper Leg	Left Thigh	Place the markers at the front center of the thigh near the midline. This marker is placed for distinguishing left and right side of the skeleton. For best results, slightly offset the height of right and left marker to introduce an asymmetry.
RTH	Right Thigh
LSK	Upper Leg	Left Superior Knee	Place the markers on the shin bone near the midline of the lower leg. This marker is placed for distinguishing left and right side of the skeleton. For best results, slightly offset the height of right and left marker to introduce an asymmetry.
RSK	Right Superior Knee
LTTC (TT[2])	Lower Leg	Left Tibial Tubercle	Place the marker about 2-3 cm below the knee cap bone. This marker should be placed on the most anterior point of the tibial tuberosity.
RTTC (TT[2])	Right Tibial Tubercle
LFAX (HF[2])	Lowe Leg	Left Fibula Apex	While standing, place the markers approximately 5 cm below the LFLE and RFLE markers. This marker should be placed on the lateral prominence of proximal end of the fibula.
RFAX (HF[2])	Right Fibula Apex

Foot Markers
Labels	Related Segment	Anatomical Location	Placement Description
LFAL(LM[2])	Lower Leg/Foot	Left Fibula Ankle Lateral	Place the maker on the lateral side of the ankle axis; on the lateral prominence of the lateral malleolus bone.
RFAL	Right Fibula Ankle Lateral
LTAM* (MM[2])	Lower Leg/Foot	Left Talus Ankle Medial	Place the maker on the medial side of the ankle axis; on the medial prominence of the medial malleolus bone
RTAM*(MM[2])	Right Talus Ankle Medial
LFM5(VM[2])	Foot	Left Foot Fifth Metatarsal	Place the marker on the dorsal aspect of the fifth metatarsal bone.
RFM5	Right Foot Fifth Metatarsal
LFM2* (SM[2])	Foot	Left Foot Second Metatarsal	Place the marker on the dorsal aspect of the second metatarsal bone.
RFM2*	Right Foot Second Metatarsal
LFM1 (FM[2])	Foot	Left Foot First Metatarsal	Place the marker on the dorsal aspect of the first metatarsal bone.
RFM1	Right Foot First Metatarsal
LFCC (CA[2])	Foot	Left Foot Calcaneus	Place the marker on center of the heel, where the Achilles tendon attaches to the calcneous bone.
RFCC	Right Foot Calcaneus (Heel)
LDP1	Toes	Left First Distal Phalanx	Place the marker near the end of the big toe. More specifically, the marker should be placed at the distal end of the first phalanges.
RDP1	Toes	Right First Distal Phalanx

Added on the 54 Biomech Markerset
Labels	Related Segment	Anatomical Location	Additional Description
LV1 (L1[1])	Lumbar	Lumbar Vertebra 1	These markers are included only in the Biomech (54) markerset, and these markers are evenly distribute along the lumbar spine. The first lumbar spine vertebra (LV1) is located slightly above where the iliac posterior spine (LIPS/RIPS) markers are located. Accordingly, the LV3 and the LV5 spines are located two and four vertebrae higher along the lumbar spine.
LV3 (L3[1])	Lumbar Vertebra 3
LV5 (L5[1])	Lumbar Vertebra 5
RHLT	Thorax / Upper Arm	Right Humeral Lesser Tubercle	Place the marker on the anterior side of the shoulder axis. For best result, ask the subject to abduct and adduct the arm few times to palpate where the joint is located.
LHLT	Thorax / Upper Arm	Left Humeral Lesser Tubercle

Asymmetry

Asymmetry is the key to avoiding the congruency for tracking multiple markersets. When there are more than one similar marker arrangements in the volume, marker labels may be confused. Thus, it is beneficial to place segment makers — joint markers must always be placed on anatomical landmarks — in asymmetrical positions for similar rigid bodies and skeletal segments. This provides a clear distinction between two similar arrangements. Furthermore, avoid placing markers in a symmetrical shape within the segment as well. For example, a perfect square marker arrangement will have ambiguous orientation and frequent mislabels may occur throughout the capture. Instead, follow the rule of thumb of placing the less critical markers in asymmetrical arrangements.

References

<references> ^[2]

^[1]

1. Leardini, A., Biagi, F., Merlo, A., Belvedere, C., Benedetti, M.G., 2011. Multi-segment trunk kinematics during locomotion and elementary exercises. Clin. Biomech. 26, 562-571.

2. Leardini, A., Sawacha, Z., Paolini, G., Ingrosso, S., Nativo, R., Benedetti, M.G., 2007. A new anatomically based protocol for gait analysis in children. Gait Posture 26. 560-571.