Gamekeeper's<unk>  and skier's<unk>  are two similar conditions, both of which involve insufficiency of the<unk><unk><unk>  (UCL) of the<unk> . The chief difference between these two conditions is that skier's<unk>  is generally considered to be an acute condition acquired after a fall or similar abduction injury to the metacarpophalangeal (MCP) joint of the<unk> , whereas gamekeeper's<unk>  typically refers to a chronic condition which has developed as a result of repeated episodes of lower-grade hyperabduction over a period of time. There are four types of Skier's<unk>  injury: * Avulsion of distal UCL causing the pulling off of a bone chip off the proximal phalanx base. * Partial-thickness tear of the UCL * Full-thickness tear of the middle part of the UCL * Full-thickness tear of the middle part of the UCL with the proximal fragment displaced superficial to the aponeurosis of adductor pollicis, thus preventing the healing of proximal and distal segments of UCL. This condition is called Stener lesion. Gamekeeper's<unk>  is more difficult to treat because the UCL has lengthened and become thinner as a result of repeated injury. It is moderately painful compared to similar injuries. In addition to skiing, this injury (resulting from forced abduction or hyperextension of the proximal phalanx of the<unk>  is seen in a wide variety of other athletic endeavors. The most common mechanism of injury appears to be when a person extends the arm in an attempt to block a fall. The stress resulting from falling onto an abducted<unk>  produces a valgus force on the MCP joint of the<unk> , resulting in a sprain or tear of the UCL. In a recent study, 49% of UCL disruptions of the<unk>  were caused by a fall onto an outstretched hand. Sports injuries accounted for most of the remaining injuries, with only 2.4% acquired as a result of skiing injuries.
Ulnar collateral ligament injury of the thumb
Ulnar collateral ligament injury of the elbow
Metatarsophalangeal joint sprain
Ulnar nerve entrapment
Median rhomboid glossitis
Plantar calcaneal bursitis
Trapeziometacarpal osteoarthritis
Injury of axillary nerve