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A 40-year-old male sheet metal worker sustained a crush injury to his hand. His hand was treated in a short arm splint after closed reduction and percutaneous pinning of multiple metacarpal fractures. The patient’s fractures healed uneventfully however, he presented six months later with the deformity shown in Figure A. What pathoanatomic process is responsible for his deformity?
Volar plate laxity and tethering of the lateral bands at the proximal interphalangeal joints
FDP laceration distal to the origin of the lumbricals
Adhered FDP tendon of the middle finger
Imbalance between spastic intrinsics and weak extrinsics
Imbalance between strong extrinsics and deficient intrinsics
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Extrinsic imbalance from splinting a crushed hand with metacarpophalangeal joint extension causes what characteristic hand deformity?
Distal interphalangeal joint extension
Ulnar subluxation of the metacarpophalangeal joints
Proximal interphalangeal joint extension
Proximal interphalangeal joint flexion