College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What is a common characteristic of Bishop’s Hand Deformity?

Flexed thumb and extended fingers
Flexed fingers at the MCP joints
Thumb in line with fingers
All fingers being straight

The correct answer is: Flexed fingers at the MCP joints

Bishop’s Hand Deformity, also known as "claw hand," is characterized by the paralysis of the intrinsic muscles of the hand, primarily caused by ulnar nerve palsy. This results in a specific posture of the hand where the fingers exhibit flexion at the metacarpophalangeal (MCP) joints while the interphalangeal joints remain relatively extended. The flexion at the MCP joints occurs because the extrinsic flexors (those responsible for bending the fingers) are not opposed by the intrinsic muscles, which normally help maintain an ideal resting position. This imbalance leads to the appearance of flexed fingers that are particularly notable at the MCP joints. The other characteristics listed, such as a flexed thumb and extended fingers, the thumb being in line with the fingers, or all fingers being straight, do not represent the unique presentation of Bishop’s Hand Deformity. Instead, they suggest different hand positions and conditions that are not aligned with the hallmark features of this particular deformity.