This study investigated how the posture of the thumb while performing common pinch movements and the levels of pinch force applied by the thumb affect the arthrokinematics of the trapeziometacarpal joint in vivo. Fifteen subjects performed the pinch tasks at the distal phalange (DP), proximal interphalangeal (PIP) joint, and metacarpophalangeal (MP) joint of the index finger with 0%, 50%, and 8...

We present a simple kinematic model of the thumb for the animation of virtual characters. The animation is made through a pure kinematics approach, thus needing very precise limitations on the rotations of the thumb to be realistic. The thumb is made opposable thanks to the addition of two bones simulating the carpometacarpal complex.

INTRODUCTION Isolated pure dislocation of the fifth carpometacarpal (CMC) joint is a very rare injury and classified depending on displacement of the metacarpal base. This rare injury is often difficult to recognize and is liable to be overlooked. The purpose of this case report is to present a patient with an isolated dislocation of the fifth CMC joint that was satisfactorily treated with clos...

Background Arthritis of the first carpometacarpal (CMC) joint has been surgically treated in multiple ways with varying levels of success as measured by subjective and objective measures. Trapeziectomy with numerous variations in suspensionplasty comprises one of the more commonly used surgical procedures. Recently, the Mini TightRope apparatus has been utilized as a new method for achieving su...

Thumb carpometacarpal osteoarthritis (CMC OA) is a common disease, affecting up to 11% and 33% of men and women in their 50s and 60s, respectively, which leads to pain, laxity and weakness of the CMC joint. Based on the staging of the CMC OA, different forms of treatment can be used, including both conservative and surgical measures. Surgical options include osteotomy, trapezial excision, ligam...

We report a case of dorsal radiocarpal fracture dislocation with dissociation of the distal radioulnar joint. Closed reduction was unsuccessful due to interposition of the osteochondral fragments and open reduction and fixation was carried out with a satisfactory end result. The advantages of volar approach and use of external fixator in the management of this injury are discussed.