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Found 4 results

  1. Version 1.0.0

    3 downloads

    This is the normal left foot and ankle muscle model of a 56-year-old male with right anterior thigh pleomorphic leiomyosarcoma. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. The primary motions of the ankle are dorsiflexion, plantarflexion, inversion, and eversion. However, with the addition of midfoot motion (adduction, and abduction), the foot may supinate (inversion and adduction) or pronate (eversion and abduction). In order to accomplish these motions, muscles outside of the foot (extrinsic) and muscles within the foot (intrinsic) attach throughout the foot, crossing one or more joints. Laterally, the peroneus brevis and tertius attach on the proximal fifth metatarsal to evert the foot. The peroneus longus courses under the cuboid to attach on the plantar surface of the first metatarsal, acting as the primary plantarflexor of the first ray and, secondarily, the foot. Together, these muscles also assist in stabilizing the ankle for patients with deficient lateral ankle ligaments from chronic sprains. Medially, the posterior tibialis inserts on the plantar aspect of the navicular cuneiforms and metatarsal bases, acting primarily to invert the foot and secondarily to plantarflex the foot. The flexor hallucis longus inserts on the base of the distal phalanx of the great toe to plantarflex the great toe, and the flexor digitorum inserts on the bases of the distal phalanges of the lesser four toes, acting to plantarflex the toes. The gastrocnemius inserts on the calcaneus as the Achilles tendon and plantarflexes the foot. Anteriorly, the tibialis anterior inserts on the dorsal medial cuneiform and plantar aspect of the first metatarsal base as the primary ankle dorsiflexor and secondary inverter. The Extensor hallucis longus and extensor digitorum longus insert on the dorsal aspect of the base of the distal phalanges to dorsiflex the great toe and lesser toes, respectively. This model was created from the file STS_014.

    Free

  2. Version 1.0.0

    8 downloads

    This is the normal right foot and ankle bone model of a 56 year old male with right anterior thigh pleomorphic leiomyosarcoma. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. The ankle is a hinge (or ginglymus) joint made of the distal tibia (tibial plafond, medial and posterior malleoli) superiorly and medially, the distal fibula (lateral malleolus) laterally and the talus inferiorly. Together, these structures form the ankle “mortise”, which refers to the bony arch. The normal range of motion is 20 degrees dorsiflexion and 50 degrees plantarflexion. Stability is provided by the anterior talofibular ligament (ATFL), calcaneofibular ligament (CFL), and posterior talofibular ligament (PTFL) laterally, and the superficial and deep deltoid ligaments medially. The ankle is one of my most common sites of musculoskeletal injury, including ankle fractures and ankle sprains, due to the ability of the joint to invert and evert. The most common ligament involved in the ATFL. The foot is commonly divided into three segments: hindfoot, midfoot, and forefoot. These sections are divided by the transverse tarsal joint (between the talus and calcaneus proximally and navicular and cuboid distally), and the tarsometatarsal joint (between the cuboids and cuneiforms proximally and the metatarsals distally). The first tarsometatarsal joint (medially) is termed the “Lisfranc” joint and is the site of the Lisfranc injury seen primarily in athletic injuries. This model was created from the file STS_014.

    Free

  3. Version 1.0.0

    8 downloads

    This is the normal left thigh muscle model of a 56 year old male with contralateral anterior thigh pleomorphic leiomyosarcoma. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. The thigh is divided into three compartments: the anterior, posterior, and adductor. The anterior compartment contains the “quadriceps muscles”, made up of the vastus lateralis, vastus medialis vastus intermedius, and rectus femoris, and the sartorius. These muscles are innervated by the femoral nerve (L3-L4), and act to extend the leg. The Sartorius muscle originates at the ASIS and crosses anterior to the quadriceps muscle to insert on the medial tibia in the pes anserinus. The posterior compartment contains the “hamstrings”, made up of the semitendinosus, semimembranosus, and short and long heads of the biceps femoris. These muscles act to flex the leg. All of these muscles are innervated by the sciatic nerve (tibial division) except for the short head of the biceps femoris, which is innervated by the sciatic nerve (peroneal division). The adductor compartment contains the adductor longus, adductor brevis, adductor magnus, and gracilis, which act to adduct the thigh. These muscles are innervated by the obturator, and the adductor magnus has dual innervation with the sciatic nerve. In addition, the obturator externus (a thigh external rotator) and pectineus muscle (thigh flexor and adductor) are located within this compartment. This model was created from the file STS_014.

    Free

  4. Version 1.0.0

    1 download

    These images are the bilateral leg muscle renderings of an 82 year old male with a dedifferentiated liposarcoma in the anterior compartment of the left thigh. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. Liposarcomas are the second most common soft tissue sarcoma in adults, occurring more commonly in males between the ages of 50 and 80 years old. They present as a slow growing, painless mass typically located in the extremities, with the thigh being the most common location. Multiple variants of liposarcomas exist, but the dedifferentiated type is a high-grade sarcoma. Dedifferentiated liposarcomas are typically located adjacent to a well-differentiated lipomatous lesion. The incidence of pulmonary metastasis increases with grade. Therefore, work up of the lesion consists of MRI, biopsy through the area of future resection, CT of the chest, abdomen, and pelvis to rule out metastases. Treatment consists of radiation and wide surgical resection but chemotherapy agents are being developed to target chromosomal abnormalities associated with certain well-differentiated and dedifferentiated liposarcomas. This patient received radiation and resection of the tumor and has not had a metastasis or recurrence in 4.5 years. This figure came from the file STS_013.

    Free

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