cam deformity of the femoral head
46e942b11499ac84020e7023ce25a06e
Cam Deformity A cam deformity is an eccentricity at the junction between the head of the femur and the neck. The head of the femur should be virtually spherical and should sit on the neck like a lollipop on a (broad) stick: quite symmetrically: if it doesn’t sit symmetrically, the range of hip flexion (knee to chest movement) will be restricted or uncomfortable.
8ddc25d8959f00cddf863096f77f43ef
Femur The head of the femur, which articulates with the acetabulum of the pelvic bone, comprises two-thirds of a sphere. It has a small groove, or fovea, connected through the round ligament to the sides of the acetabular notch. The head of the femur is connected to the shaft through the neck or collum. The neck is 4–5 cm.
ab0b1454f6e399e3b8d19132e192d7ff
CAM type femoroacetabular impingement with fracture MRI pelvis reveals left femur neck fracture with bilateral femoroacetabular impingement FAI type 1 ( or CAM type of FAI) with anterosuperior labral tears ( partial tear at right hip and complete tear at left ). Femoro-acetabular impingement.
9fa143d10ef4177c776dbf89f97b64ec
MR Imaging of Femoroacetabular Impingement A reduced femoral head-neck junction can be best assessed on MRI using dedicated oblique axial images that are obtained parallel to the long axis of the femoral neck. Methods of quantitatively evaluating the femoral head-neck offset have been described with the alpha angle.
5bdf845ef64d08e0d124e9fddcdb4b30
Anatomy In cam impingement the femoral head is not round and cannot rotate smoothly inside the acetabulum. A bump forms on the edge of the femoral head that grinds the cartilage inside the acetabulum. Combined. Combined impingement just means that both the pincer and cam types are present.(Left) Pincer impingement.n cam impingement the femoral head is not round and cannot rotate smoothly inside the acetabulum. A bump forms on the edge of the femoral head that grinds the cartilage inside the acetabulum. Combined. Combined impingement just means that both the pincer and cam types are present.
636c61190099edafadbc86cd7f7b991e
MRI Web Clinic â September 2011 This 79yo male with a history of right hip pain for 1 month has features of both pincer and cam-type FAI. Femoral head asphericity (yellow arrow), irregular anterosuperior bump (green arrowheads), os acetabuli (yellow arrowhead) and hypertrophic acetabular rim (blue arrow).
2e911f3b3c9d39fe81b970cccd5d4c9a
Hip Impingement Hip impingement may be caused by a misshapen femoral head, deformed femoral neck, or a hip socket that covers too much of the femoral head. Over time, repetitive “bumping” or impingement of the femur on the rim of the acetabulum leads to cartilage and labral damage.
b3ce218c1426daeaf8ceacb75db85c92
- A femoral neck fracture is a hip fracture in which the neck of the thigh bone (femur) is partially or completely broken. Femoral neck fractures may occur as a result of a fall or motor vehicle accident, or they may occur spontaneously because of a disease process such as osteoporosis. Stress fractures can result from repetitive mechanical stress or structural defects in the bone that make it weak or brittle.
378a38b5e5b0bb13283fbfb5332dd977
- Femoroacetabular impingement (FAI) is a condition where the bones of the hip are abnormally shaped. Because they do not fit together perfectly, the hip bones rub against each other and cause damage to the joint. Anatomy. The hip is a ball-and-socket joint.
673dc1e10594a4a945052fae785f7c1a
Anatomy Femoroacetabular impingement (FAI) is a condition in which extra bone grows along one or both of the bones that form the hip joint — giving the bones an irregular shape. Because they do not fit together perfectly, the bones rub against each other during movement.
f3b75e38ccabd26a40d708c6380b6cfd
Cam and Pincer Femoroacetabular Impingement: Characteristic MR Arthrographic Findings in 50 Patients Cam impingement is relieved by reshaping the nonspherical peripheral portion of the femoral head and the adjacent femoral neck. In pincer FAI, the reason for the conflict between the acetabulum and the femur is an overcoverage of the acetabulum.
1dbab74ffdff4dc0dffd1b1665b3609b
Relation between increase in length of hip axis in older women between 1950s and 1990s and increase in age specific rates of hip fracture Main outcome: Length of hip axis (distance from the medical aspect of the pelvis to the lateral aspect of20the femur along the axis of the femoral neck), length of femoral neck (length of hip axis excluding the femoral head and more medial structures), and width of femoral neck (see figure).
d132c8376f785a32b25bc22d0ad0dce5
Femoral head fractures Femoral head fractures. Femoral head fractures are very rare injuries, almost always caused by hip dislocations. The femoral head is fed by three arteries, the main one of which is the medial femoral circumflex. If this is disrupted, there is a high risk of avascular necrosis. The standard classification of femoral head fractures is that of Pipkin.
98b7f6e8aecb32353d294823cfe9e3cb
Femoral Neck The femoral neck, normally, forms an angle of 120-135 degrees with the shaft of the thigh bone (Picture 3). This acts as a lever in easing the action of the muscles around the hip joint. An increase or decrease in this angle beyond the normal limits causes improper action of the muscles, and interferes with walking.he femoral neck, normally, forms an angle of 120-135 degrees with the shaft of the thigh bone (Picture 3). This acts as a lever in easing the action of the muscles around the hip joint. An increase or decrease in this angle beyond the normal limits causes improper action of the muscles, and interferes with walking.
801588c46fed72241308ad29197dbba8
Fixing Hip Fractures The femoral neck is the region of the femur bounded by the femoral head proximally and the greater and lesser trochanters distally (shown below). A femoral neck fracture is intracapsular, that is within the hip joint and beneath the fibrous joint capsule.
7fbf790ba6282f5de01b1f5e16d4dfcb
- Studies have shown that the normal taper of a femur is from 2 - 4°. 7 Stems with tapers larger than 4° areunlikely to achieve a proper fit with the averagepatient’s anatomy; a tapered stem with a 5°taper was shown to have an intraoperativefracture rate of 8%.
633df3b38e5d2eff47276a01bdf75630
Femoroacetabular Impingement: A Patient's Guide to Hip Mobility and Hip Arthroscopy Cam-type impingement is when such development leads to the bump of bone on the femoral head and/or neck. Normal development can also result in the overgrowth of the acetabular rim, or pincer-type impingement. Hip trauma (falling on one’s hip) can also lead to impingement.
85796c983a4f0abe2bee330c5a5a3e6a
Femoroacetabular impingement: a review of diagnosis and management Femoroacetabular impingement and the cam-effect: A MRI-BASED QUANTITATIVE ANATOMICAL STUDY OF THE FEMORAL HEAD-NECK OFFSEt J Bone Joint Surg Br 2001 83-B: 171176 7.
0de9bb39e24dee0eb3f2c0fa5d4a3ec3
FEMOROACETABULAR IMPINGEMENT The more commonly used classification is that of Ganz et al who classified Femoroacetabular impingement into two distinct types based on the morphology of the femoral head and acetabulum: A) The Cam type and. B) The Pincer type Cam Impingement Cam literally means the projecting part of a cog-wheel.
323245d0a9efd79cc93a434c606023e4
Anatomy The hip is a ball-and-socket joint. The socket is formed by the acetabulum, which is part of the large pelvis bone. The ball is the femoral head, which is the upper end of the femur (thighbone).n cam impingement the femoral head is not round and cannot rotate smoothly inside the acetabulum. A bump forms on the edge of the femoral head that grinds the cartilage inside the acetabulum. Combined. Combined impingement just means that both the pincer and cam types are present.
b0193a322801bb4ab05b92086d4dfe3f
Cam and Pincer Femoroacetabular Impingement: Characteristic MR Arthrographic Findings in 50 Patients FAI is a cause of. premature osteoarthritis in the hip (2). Cam FAI and pincer FAI can be differ-. entiated on the basis of a predominance. of either a femoral or an acetabular ab-. normality (1,3,4). In cases of cam FAI, the nonspherical shape of the femoral. head at the femoral head-neck junction. and reduced depth of the femoral waist. leads to abutment of the femoral head-. neck junction against the acetabular rim. (5). In cases of pincer FAI, acetabular.
7069e4fd8fadc40819055f16bc34f109
- The Pincer form of the impingement is typically secondary to “retroversion”, a turning back of the socket, “profunda”, a socket that is too deep, or protrusio, a situation where the femoral head extends into the pelvis. Most of the time, the Cam and Pincer forms exist together- i.e., mixed impingement.. FAI is associated with cartilage damage, labral tears, early hip arthritis, hyperlaxity, sports hernias, subspinous AIIS impingement, ischiofemoral impingement, and low back pain.
cc917a227c33b6d9a27d1b9276fa0b35
Hip Impingement Cam impingement occurs because the ball-shaped end of the femur (femoral head) is not perfectly round. This interferes with the femoral head’s ability to move smoothly within the hip socket. Pincer impingement involves excessive coverage of the femoral head by the acetabulum. With hip flexion motion, the neck of the femur bone “bumps” or impinges on the rim of the deep socket. This results in cartilage and labral damage.
250b2c92b093dd75a69d5dea623f232c
The Incredible (?) Dr Pol I understand that. But when I see Dr Pol doing an orthopedic surgery (in this case, a femoral head osteotomy) without a cap, mask, or gown on, and minimal sterile surgical technique, I cringe inside. This is a major surgery in which the head of the femur is cut off. Infection is a very, very big concern.
a5c056538c5866e813cb501944165b1c
- The midshaft osteotomy is performed for mild-to-moderate hallux valgus deformities, with an intermetatarsal angle greater than 15° but a hallux valgus angle less than 40°, though large degrees of correction can also be achieved with greater rotation of the fragments.
5d0064b39f4258bd81a58a3f26503d72
MRI Web Clinic â September 2011 Figure 3:A convex bump (yellow arrowheads) is present at the anterior femoral head-neck junction. An area of chondral loss (red arrows) is present on the acetabular side of the joint. Subtle subchondral degenerative changes (red arrowhead) are located on the corresponding femoral side of the joint.