Diagnosis of a full-thickness tear can be learned to a high degree of accuracy. Despite the radiologist's level of experience and knowledge of the arthroscopic findings, the sensitivity for diagnosis of partial tears is poor.

Bone and joint changes in cerebral palsy result from muscle spasticity and contracture. The spine and the joints of the lower extremity are most commonly affected. Scoliosis may progress rapidly and may continue after skeletal maturity. Increased thoracic kyphosis and lumbar lordosis, spondylolisthesis, spondylolysis, and pelvic obliquity may accompany the scoliosis. Progressive hip flexion and adduction lead to windswept deformity, increased femoral anteversion, apparent coxa valga, subluxation, deformity of the femoral head, hip dislocation, and formation of a pseudoacetabulum. In the knee, flexion contracture, patella alta, and patellar fragmentation are the most commonly seen abnormalities. Recurvatum deformity can also develop in the knee secondary to contracture of the rectus femoris muscle. Progressive equinovalgus and equinovarus of the foot and ankle are associated with rocker-bottom deformity and subluxation of the talonavicular joint. Early recognition of progressive deformity in patients with cerebral palsy allows timely treatment and prevention of irreversible change.

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Anterior and inversion stress were applied to the lateral ligaments of the ankle and the findings compared with the arthrograms. Fifty-five patients underwent stress radiography of both ankles and arthrography of the injured ankle within 72 hours of acute injury to the lateral ligaments. Ten patients had normal arthrograms and 45 had evidence of ligamentous injury. Anterior stress measurements could not be correlated with arthrography, and no differentiation between single and double ligament tears could be made. Inversion stress testing was very accurate in predicting ligamentous injury when the angle of inversion was 10 degrees or greater but achieved this degree of accuracy in only 38.2% of patients.

Iliopsoas bursa imaging is a simple, rapid, and reproducible method with which abnormal iliopsoas tendon motion can be documented in patients with internal snapping hip syndrome and is also useful for diagnosis of other causes of atypical hip pain. Therapeutic injection into the iliopsoas bursa may delay or obviate surgery.