| 摘要 |
<p>PROBLEM TO BE SOLVED: To correctly redintegrate and prevent postoperative dislocation by allowing the use of a neck trial of nearly the same shape as the neck of a stem practically used. SOLUTION: A ball plunger 4 urged so as to protrude a part of the ball 44 to the outside periphery is provided in a chuck portion 3 protruding from one end of a broach trial 1, and an engagement hole 21 engaging the chuck portion 3 into the neck trial 2 is provided, and an engagement means 7 to engage with the ball plunger 4 is provided in the engagement hole 21.</p> |
