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Mallet finger is a common athletic injury. It may occur due to a tendinous lesion or due to a bony avulsion at the level of the extensor tendon’s insertion at the base of the distal phalanx. In all cases, the result is variable loss of the active extension of the distal phalanx. The initial treatment involves immobilising the distal interphalangeal joint in neutral position, followed by X-ray examination to check for any fracture and joint subluxation. When surgery is indicated, extension blocking technique is preferred. Careful follow-up is necessary to minimise the risk of complications.

The hip joint is a common site of symptoms in Multiple Osteochondromatosis (MO), but is infrequently involved by solitary exostoses. In young children with MO, coxa valga is characteristic; features of hip dysplasia occurs in less than 50% of individuals and are usually mild. In older children, hip impingement - either extracapsular or intracapsular - is a common feature and is managed according to symptoms, anatomical location and the extent of osteochondromatosis. Hip joint subluxation is an urgent problem requiring surgical intervention. Malignant change is very rare in the first two decades of life.

This chapter aims to analyze the state-of-the-art technology in quantifying the “feel” related to the pivot shift phenomenon. Therefore, the presented concepts are used to support this “feel” rationale, which is mainly associated with the sudden reduction that happens after joint subluxation. All of the presented methods are related to the possibility of measuring the “clunk” that can be felt within the knee joint associated to anterior cruciate ligament (ACL) injury. Scientific literature has reported the use of specific parameters – such as velocity and acceleration – that are related to the dynamic nature of the pivot shift phenomenon and also introduced the use of different devices and systems that are able to directly measure both velocity and acceleration. Due to the possibility of being used in a clinical setting, inertial sensors are playing an increasing role in this context.

Most doctors believe that water sports are save and harmless concerning foot and ankle injuries. However, analyzing injury patterns in Windsurf, Kitesurf and wave surf, foot and ankle injuries rate within the most frequent. Collision with the board, obstacles in the water close to the beach and rotation trauma with the foot fixed in foot straps and bindings are the causes. Superficial wounds may cause dangerous infections especially in tropical water. Midfoot injuries tend to be overlooked and may cause painful chronic instability and arthritis. Surfers must be instructed in self-management of open wounds. Lisfranc joint Subluxation and subtalar injuries must be excluded after a fall with the foot caught in the foot strap.