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Internal Derangement of Knee

Related Terms

Knee Instability
Torn Ligament(s)
Torn Meniscus

Differential Diagnoses

Aneurysm
Bursitis
Chondromalacia of patella
Congenital discoid meniscus
Cysts
Osteoarthritis
Osteochondritis
Rheumatoid arthritis
Thrombophlebitis
Tumors

Comorbid Conditions

Arthritis
Decreased muscle tone
Diabetes mellitus
Inadequate nutrition
Obesity
Other destabilizing conditions of the knee
Peripheral vascular disease
Previous knee injury

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Factors influencing length of disability depend on the nature of the derangement, fitness level and age of the individual, intervention requirements, adherence to a rehabilitation program, proper rest interval, job requirements, the development of complications, and the presence of comorbid conditions or prior injury to the knee. Any task that stresses an already compromised knee will prolong and exacerbate the problem.

Duration Trends from Reference Data

DURATION TRENDS

ICD-9-CM: 717, 717.8, 717.9

Cases	Mean	Min	Max	No Lost Time	Over 6 Months
4772	53	0	251	0.4%	2.1%

Percentile:	5^th	25^th	Median	75^th	95^th
Days:	9	22	41	71	146

Medical Codes

	ICD-9-CM:
	717 -	Internal Derangement of Knee; Degeneration, Rupture (old), or Tear (old) of Articular Cartilage or Meniscus of Knee
	717.8 -	Other Internal Derangement of Knee
	717.9 -	Unspecified Internal Derangement of Knee

Specialists

Orthopedic (Orthopaedic) Surgeon
Physiatrist
Physical Therapist
Sports Medicine Physician

Source: Medical Disability Advisor

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