Summary Intrinsic plus hand is a hand posture characterized by MCP flexion with PIP and DIP extension that is caused by an imbalance between spasic intrinsics and weak extrinsic muscles of the hand Diagnosis is made by clinical exam which shows MCP flexion and IP joint extension Treatment may be nonoperative or operative depending on the severity of the contracture and impact on quality of life. Epidemiology Incidence rare < 1 per 100,000 annually Etiology Pathophysiology trauma direct trauma indirect trauma vascular injury compartment syndrome rheumatoid arthritis MCP joint dislocations and ulnar deviation lead to spastic intrinsics neurologic pathology traumatic brain injury cerebral palsy cerebrovascular accident Parkinson's syndrome Pathoanatomy spastic intrinsics leads to flexion of the MCP and extension of the IP joints EDC weakness fails to provide balancing extension force to MCP joint FDS & FDP weakness fail to provide balancing flexion force to PIP and DIP joints Presentation Symptoms difficulty gripping large objects Physical exam inspection MCP joint flexion and IP joint extension provocative tests Bunnell test (intrinsic tightness test) login to view 2 more bullets Imaging Radiographs no radiographs required in diagnosis or treatment Treatment Nonoperative passive stretching indications login to view 1 more bullet Operative proximal muscle slide indications login to view 1 more bullet distal intrinsic release (distal to MP) indications login to view 2 more bullets Techniques Proximal muscle slide techinque subperiosteal elevation of interossei lengthens muscle-tendon unit Distal intrinsic release technique resection of intrinsic tendon distal to the transverse fibers responsible for MCP joint flexion