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Transcript of LUXATING PATELLA & CRUCIATE LIGAMENT - … 10. 11. ... lateral fabella to the tibial crest and tied...
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LUXATING PATELLALUXATING PATELLA
& CRUCIATE LIGAMENT & CRUCIATE LIGAMENT
INJURYINJURYIN THEIN THE
SCOTTISH TERRIERSCOTTISH TERRIERGeorge George ProcentoProcento, MD Scottish Terrier Club of Chicago January 15, MD Scottish Terrier Club of Chicago January 15, 2006, 2006
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Loose KneecapLoose Kneecapin the Scottish Terrier in the Scottish Terrier
& How it Can & How it Can Increase RiskIncrease Risk
of Serious of Serious & Permanent & Permanent Knee InjuryKnee Injury
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NERANERA1992 1992 -- 20042004
••CMO *CMO * (age 4(age 4--7 mo.)7 mo.)
••LUXATING PATELLAELUXATING PATELLAE
••CRANIAL CRUCIATECRANIAL CRUCIATELIGAMENT INJURYLIGAMENT INJURY
(age 8+ yrs.)(age 8+ yrs.)
••KIDNEY FAILUREKIDNEY FAILURE(age 11(age 11+ + yrs.)yrs.)
** CCranioranioMMandibularandibularOOsteopathysteopathy(Jan. 2005 (Jan. 2005 –– STCC Presentation)STCC Presentation)
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XRAY of NERA4 month old
Scottish Terrier withEarly Signs of CMO
( CranioMandibularOsteopathy )
ARROWS: Areas of HyperOstosis / Abnormal Increase in Bone Growth / Density
Courtesy of Sheree Block,DVM, Buffalo Grove, IL
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Courtesy of D. Rosenstein,DVM
(MSU Vet. Radiology)
from U. Mostosky,DVM (MSU)
XRAY of DogWith Severe CMO
Dog skull from an extremely severe case of
CMO
From Leonard’s Orthopedic Surgery of the Dog and Cat, 3rd ed.
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NERANERA1992 1992 -- 20042004
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Daniel A. Daniel A. DegnerDegner, DVM, DACVS, DVM, DACVSAuburn Hills, MichiganAuburn Hills, Michigan
Doctor of Veterinary Medicine Doctor of Veterinary Medicine 1986 1986 -- 19901990
Internship Internship -- Small Animal Medicine and SurgerySmall Animal Medicine and Surgery1992 1992 -- 19931993
Residency Residency -- Small Animal SurgerySmall Animal Surgery1993 1993 –– 19961996
Vetsurgerycentral.comVetsurgerycentral.com 1010
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http://home.swipnet.se/~w-33901/patella.html
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1995 STCA Health Survey *DISEASE DISEASE Mode of Mode of Frequency of Est. Carrier Frequency of Est. Carrier
InheritanceInheritance Occurrence FrequencyOccurrence FrequencyCMO R ~ 1 / 1700 4.7%Hip Dysplasia Poly ~ 1 / 1700 4.7%von Willebrand's R ~ 1 / 500 8.4%Cerebellar ataxia R ~ 1 / 200 13.0%
LuxatingLuxating Patella R? / Poly? ~ 1 / 80Patella R? / Poly? ~ 1 / 80 19.5%19.5%
Underbite Und ~ 1 / 50 24.7%Scottie cramp R ~ 1 / 30 29.3%AtopicAtopic dermatitisdermatitis Und Und ~ 1 / 18 ~ 1 / 18 35.8% 35.8%
(skin allergies)(skin allergies)
R = Recessive, D = Dominant, Poly = Polygenic, Und = Undetermined, X-R = Sex-linked recessive* http://clubs.akc.org/stca/healthsurvey.htm
Control of Canine Genetic Diseases, G.Padgett, DVM (1998)
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1995 STCA Health Survey *DISEASE Mode ofMode of Frequency of Est. Carrier
Inheritance Inheritance Occurrence FrequencyLuxatingLuxating PatellaPatella R? / Poly?R? / Poly? ~ 1 / 80 19.5%
BREEDING CONSIDERATIONSBREEDING CONSIDERATIONS. . . Because of the strong genetic relationshipsanimals with this disorder should NOT be used for breeding. They can still be excellent pets - and those that do require surgery will usually lead perfectly normal lives without any restrictions on activity.
peteducation.com Race Foster, DVM Marty Smith, DVM
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ANATOMYANATOMY
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ANATOMYANATOMY
ANGUSANGUS1818
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2020
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.
Newmanveterinary.com
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Jeff Vidt, DVM www.drjwv.com
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CRUCIATE CRUCIATE -- from CRUX / CRUSISfrom CRUX / CRUSIS"CROSS""CROSS"
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peteducation.competeducation.com Race Foster, DVM Marty Smith, DVMRace Foster, DVM Marty Smith, DVM
A dog from one of the smaller breeds runs across the yard chasing a tossed ball. In mid-stride, he yelps in pain and pulls his left hind leg off of the ground. After a second, he continues limping on in a three-legged fashion. After ten minutes, the rear leg drops back down to the ground and he uses it normally. This episode occurs maybe once a week. It never really seems to bother him that much – a yelp of pain, a short period of lameness, and in a few minutes he is back to his old self. (continued . . .)
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peteducation.competeducation.com Race Foster, DVM Marty Smith, DVMRace Foster, DVM Marty Smith, DVM
(continued) Typically, he is a small or toy breed such as a LhasaApso, Pekingese, Pomeranian, Poodle, or Boston Bull. A luxating patella may affect some animals much more severely. They may hold the leg up for several days and show considerable discomfort. Dogs who have a luxating patella on both hind legs may change their entire posture, by dropping their hindquarters and holding the rear legs farther out from the body as they walk. Those most severely affected may not even use their rear legs, walking by balancing themselves on their front legs like a circus act, or holding their hindquarters completely off the ground.
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LUXATION: partial dislocation (misalignment) LUXATION: partial dislocation (misalignment) AKA AKA ““SUBLUXATIONSUBLUXATION””
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HUMAN KNEE:HUMAN KNEE:
PATELLAR PATELLAR SUBLUXATIONSUBLUXATION
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www.merckvetmanual.com
DOGDOG’’ss RIGHT RIGHT PATELLA:PATELLA:SEVERELY SEVERELY
MISALIGNEDMISALIGNED
““LUXATEDLUXATED””
DOGDOG’’ss LEFT LEFT PATELLA:PATELLA:NORMALNORMALPOSITIONPOSITION
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Courtesy of Diana Rosenstein,DVM, MSU
DOGDOG’’ss PATELLA:PATELLA:
NORMAL POSITIONNORMAL POSITION
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Courtesy of Diana Rosenstein,DVM, MSU
DOGDOG’’ss PATELLA:PATELLA:
MISALIGNED / MISALIGNED / ““LUXATEDLUXATED””
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www.petplace.com
DOGDOG’’ss PATELLA:PATELLA:
SEVERELY MISALIGNED SEVERELY MISALIGNED ““LUXATEDLUXATED””
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Which dogs are at risk Which dogs are at risk of having a of having a luxatedluxated patella?patella?
Smaller breeds of dogs, especially Miniature and Toy Poodles, have the highest incidence of patella luxation. Genetics can play a role.In certain breeds that have extremely short legs such as the Basset Hound or Dachshund, patellar luxation is thought to be secondary to the abnormal shape of the femur and tibia. The curvatures of the bones in these breeds work in conjunction with the forces of the quadriceps muscles to displace the patella to the inside. IMPORTANT – not all members of these breeds are affected with patellar luxation, only a small portion.
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In certain breeds that have extremely short legs . . .. . .PATELLAR LUXATION is thought to be secondary to the abnormal shape of the femur and tibia. The curvatures of the bones in these breeds work in conjunction with the forces of the quadriceps muscles to displace the patella to the inside.
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GRADES of PATELLAR LUXATION:GRADES of PATELLAR LUXATION:•• [ 1 ] INTERMITTENT[ 1 ] INTERMITTENT – asymptomatic or occasional limp; Patella can be manually luxated at full extension of the stifle, but returns to proper position when pressure is released•• [ 2 ] FREQUENT[ 2 ] FREQUENT – occasional / brief limp; spontaneous resolution; Minimal or infrequent apparent discomfort to dog•• [ 3 ] NEAR[ 3 ] NEAR--PERMANENTPERMANENT - frequent or always limp; avoid jumping on/off things; patella fixed in luxated position or will not return when manually displaced; dog may walk with limb in a semi-flexed position or avoid weight bearing•• [ 4 ] PERMANENT[ 4 ] PERMANENT - always walk with limb in a semi-flexed position or avoid weight bearing; unable to manually extend limb from flexed position; pain & disability• [ 5 ] vs. [ 5 ] vs. ““ SEVERE GRADE 4SEVERE GRADE 4””
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MEDICAL (NONMEDICAL (NON--SURGICAL) THERAPY ?SURGICAL) THERAPY ?
. . . has little corrective ability in this disorder . . . has little corrective ability in this disorder and surgery is therefore required and is the and surgery is therefore required and is the treatment of choice. treatment of choice.
BUT:BUT:Surgical treatment is Surgical treatment is NOTNOT necessary necessary in every dog with this condition.in every dog with this condition.
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SURGERY for SURGERY for LuxLux. Patella. PatellaGroove at the base of the femur may be surgically deepened to better contain the patella
•Patella may be 'tied down' laterally (on the outside) to prevent it from deviating medially (toward the inside)
•Tibial Tubercle / bony protuberance at the site of the attachment of the quadriceps tendon on the tibia, may be cut off and then re-attached in a more lateral position.
•All of these procedures work well and the type performed depends on the individual case and the Veterinary surgeon
•The dog should respond quickly after surgery and is usually completely recovered within thirty days, using his legs in normal fashion.
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Surgical Correction?Surgical Correction?
What are the risks?Uncorrected, the patellar ridges will wear, the groove will become even shallower and the dog will become progressively more lame. Arthritis will prematurely affect the joint, causing a permanently swollen knee with poor mobility. Therefore, a good evaluation needs to be done by your veterinarian early in the condition to prevent long-term arthritic crippling. 3939
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RISKS OF RISKS OF NOT NOT SURGICALLY SURGICALLY CORRECTING LUXATING PATELLACORRECTING LUXATING PATELLA::
••DEGENERATIVE ARTHRITISDEGENERATIVE ARTHRITIS••LAMENESSLAMENESS••CRUCIATE LIGAMENT INJURYCRUCIATE LIGAMENT INJURY
RISKS OF SURGERY:RISKS OF SURGERY:••FAILURE / RELAPSEFAILURE / RELAPSE••MORE SURGERYMORE SURGERY••POSTPOST--OP INFECTIONOP INFECTION••ANESTHESIA DEATHANESTHESIA DEATH
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F F -- FEMURFEMURP P -- PATELLAPATELLAT T -- TIBIATIBIACCL CCL -- CRANIAL CRANIAL CRUCIATE CRUCIATE LIGAMENTLIGAMENTRED ARROW RED ARROW --““TIBIAL THRUSTTIBIAL THRUST””DUE TO UNSTABLEDUE TO UNSTABLESTIFLE (KNEE)STIFLE (KNEE)
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Newmanveterinary.com 4444
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RISK FACTORS forRISK FACTORS forCRANIAL CRUCIATE CRANIAL CRUCIATE LIGAMENT INJURYLIGAMENT INJURY
••OBESITYOBESITY••AGE & DECONDITIONINGAGE & DECONDITIONING••PATELLAR LUXATIONPATELLAR LUXATION••POOR CONFORMATIONPOOR CONFORMATION
(IMPERFECT LEG ANATOMY)(IMPERFECT LEG ANATOMY)••EXCESSIVE CAUDAL SLOPE EXCESSIVE CAUDAL SLOPE
OF TIBIAL PLATEAUOF TIBIAL PLATEAU••NARROWED PATELLAR NOTCHNARROWED PATELLAR NOTCH••TRAUMATRAUMA
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““FRISBEE CATCHFRISBEE CATCH”” ::A SIGNIFICANT RISKA SIGNIFICANT RISK
OF SERIOUS LEG OF SERIOUS LEG INJURIES IN DOGS ?INJURIES IN DOGS ? 4747
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WHY WHY ““FRISBEEFRISBEE”” ISISNOT A SPORTNOT A SPORT
FOR SCOTTIESFOR SCOTTIES
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““INCOMPETENT HANDLINGINCOMPETENT HANDLING”” : A RISK: A RISKOF LEG INJURIES IN SCOTTIES ?OF LEG INJURIES IN SCOTTIES ?
SCOTTIES SHOULD BE CARRIED WITH TWO HANDS ! . . .SCOTTIES SHOULD BE CARRIED WITH TWO HANDS ! . . . 4949
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. . . OR ELSE . . .. . . OR ELSE . . .5050
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SOMETHING SOMETHING LIKELIKE
THIS THIS MIGHT MIGHT
HAPPEN ! ! !HAPPEN ! ! !
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BARNEY BUSHBARNEY BUSH
MISS BEAZLEY BUSHMISS BEAZLEY BUSH
MUCH BETTER ! MUCH BETTER ! -- TWO HANDS !TWO HANDS ! 5252
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* CCL INJURY* CCL INJURYCAUSES:CAUSES:• Patellar Luxation• Trauma• Degenerative Changes• Hereditary ?(anatomic
abnormalities)
SIGNS:SIGNS:• Limp / Lameness• Abnormal Gait / Flexed
Hindlimb• Joint Swelling /
Tenderness• Anterior Drawer Sign
BREED PREDILECTION:BREED PREDILECTION:• Large size Breeds• Labrador retriever• Rottweiler
DIAGNOSIS:DIAGNOSIS:• Clinical Examination• Observing Gait•• XRAY:XRAY:• Fat Pad• Calcified Ends of
Ruptured Ligament• Arthritis Changes
* CCL * CCL –– CRANIAL CRUCIATE LIGAMENTCRANIAL CRUCIATE LIGAMENT 5353
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SURGERY for CCL INJURYSURGERY for CCL INJURY[ 1 ] Lateral [ 1 ] Lateral FabellarFabellar ((ExtracapsularExtracapsular)::• Heavy suture material (monofilament nylon) is passed from the
lateral fabella to the tibial crest and tied in order to eliminate joint instability (drawer movement)
• Scar tissue develops around the stifle joint which helps to stabilize the joint; decreases the range of motion of the joint
F F -- FEMURFEMURP P –– PATELLAPATELLAFB FB -- FABELLAFABELLAT T -- TIBIATIBIACCL CCL -- CRANIAL CRUCIATE LIGAMENTCRANIAL CRUCIATE LIGAMENTRED ARROW RED ARROW -- ““TIBIAL THRUSTTIBIAL THRUST”” DUE DUE TO UNSTABLE STIFLE (KNEE)TO UNSTABLE STIFLE (KNEE)
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[ 1 ] Lateral [ 1 ] Lateral FabellarFabellar ((ExtracapsularExtracapsular)Stifle joint (side view) has implanted nylon bands which stabilize the joint. The blue short line represents the cranial cruciate ligament and the red lines represent the nylon bands that are passed around the fabella bone (which sits on the back of the femur bone), and through a hole that has been drilled in the front part of the tibia bone. The nylon bands (red lines) are in the same orientation as the cruciate ligament.
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Healing Phases Following Healing Phases Following FabellarFabellar Band surgery:Band surgery:• 2 weeks after the surgery, should be touching toes to the ground at a walk
• 8 weeks the lameness should be mild to moderate• 6 months after the surgery dog should be using the limb well
Success rates:Success rates:• ~ 85% of the cases are significantly improved from their preoperative state
• Extracapsular technique: ~50% of dogs will have some degree of lameness, whether it is mild or intermittent following heavy activity
• ~ 50% regain normal function of the limb. • Even though this surgery may not return the limb to perfectly normal function, these dogs usually are greatly improved over their condition prior to surgery.
D. Degner, DVM, DACVS / vetsurgerycentral.com
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SURGERY for CCL INJURYSURGERY for CCL INJURY[ 2 ] TPLO: [ 2 ] TPLO: TibialTibial Plateau Leveling Plateau Leveling OsteotomyOsteotomy
••TIBIAL THRUST:TIBIAL THRUST: When the cruciate ligament is ruptured, the slope of the tibial plateau, along with the forces exerted by the calf and quadriceps muscles cause the femur bone to slide down the top of the tibia bone called the tibial plateau. This in essence causes the tibial plateau to thrust forward with each weight-bearing stride and is called CRANIAL TIBIAL THRUSTCRANIAL TIBIAL THRUST•Results in excessive wear of the cartilage of the joint. In addition, as the tibia thrusts forward it stretches the tissues which surround the joint, which causes pain.•Also can tear of one of the cartilage pads in the knee called the MEDICAL MENISCUSMEDICAL MENISCUS. This usually results in a meniscal bucket handle tear or crush injury.••TPLO can eliminate cranial TPLO can eliminate cranial tibialtibial thrust, thus thrust, thus creating a dynamically stable stifle and sound gaitcreating a dynamically stable stifle and sound gait
F F -- FEMURFEMURP P –– PATELLAPATELLAT T -- TIBIATIBIACCL CCL -- CRANIAL CRANIAL CRUCIATE LIGAMENTCRUCIATE LIGAMENTRED ARROW RED ARROW -- ““TIBIAL TIBIAL THRUSTTHRUST”” DUE TO DUE TO UNSTABLE STIFLE UNSTABLE STIFLE (KNEE)(KNEE) 5757
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Healing Phases Following TPLO surgery:Healing Phases Following TPLO surgery:
• Convalescence more rapid than other surgical techniques of CCL repair• Approx. 50% of dogs will start to walk on the limb within 24 hours after surgery
• Within 5 days after surgery most dogs will begin weight-bearing on the operated limb
• By 2 weeks after surgery, a moderate amount of weight-bearing can be expected.
• 2 months after surgery, exercise in the form of leash walks should be gradually increased
• Complete recovery may take 3 to 5 months• At 4 months after surgery most restrictions of exercise can be lifted. Full working activities (hunting, agility, etc) can begin at 6 months after surgery. Unconstrained activity prior to this time can cause spraining of the soft tissues of the stifle (patellar ligament sprain) resulting in a prolonged recovery
• Yearly radiographs of the stifle should be taken to evaluate the degree of arthritis. The TPLO procedure should minimize the progression of degenerative joint disease
D. Degner, DVM, DACVS / vetsurgerycentral.com 6060
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Success of TPLO surgery:Success of TPLO surgery:
• ~90% of the dogs having the TPLO regain normal or near normal function of the limb (full weight-bearing)
• Remaining 10% of dogs that do not do as well have concurrent arthritis of other joints on the limb or advanced degenerative joint disease; most of these dogs in this group are also helped with the surgery
• Only a small percentage of dogs do not respond well to this type of surgery
• Dogs that have sustained a blowout fracture of the tibial plateau as a complication of falling after surgery tend to not regain as good of function on the limb
• Dogs that have been previously operated using another techniquefrequently are improved with the TPLO surgery, but the outcomemay not be as good, versus a virgin knee that has received theTPLO surgery
D. Degner, DVM, DACVS / vetsurgerycentral.com 6161
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Potential Complications of TPLO surgery:Potential Complications of TPLO surgery:• If activity is unleashed prematurely, straining of the patellar ligament can occur. Rest and anti-inflammatory medication is used to resolve this problem.
• Fracture of the narrow front part of the tibial crest can occur. This is not common, and usually will heal without any surgical intervention. Recovery will be delayed, but the final result still should be very good.
• A blow-out fracture of the tibial plateau has been seen in 3/700 cases at our hospital *. The cause of this is due to the dog falling on the stifle after surgery. Reoperation is performed in these cases.
• Loosening of the screws with shifting of the slope of the plateau may occur if the pet is not restricted during the healing phase. If the plateau has shifted a significant amount reoperation is performed
• Arthritis usually is present at the time of surgery. Surgery can help to minimize the progression of this. Anti-inflammatory medications are useful to ameliorate a flare-up of arthritis.
• Tearing of the meniscus (cartilage pad in the knee) may occur following TPLO surgery and additional surgery would be needed. This complication occurs less frequently following the TPLO versus when other surgical techniques used to stabilize the stifle joint.
* D. Degner, DVM, DACVS / vetsurgerycentral.com 6262
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ANGUS ANGUS akaaka ““FROGGYFROGGY””
SCOTTIES WHO ROUTINELY ASSUME SCOTTIES WHO ROUTINELY ASSUME ““FROGGYFROGGY”” POSTURE OF HIND POSTURE OF HIND LIMBS SUGGESTS STABLE / HEALTHY HIPS & STIFLES ( KNEES )LIMBS SUGGESTS STABLE / HEALTHY HIPS & STIFLES ( KNEES )
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LOLALOLA
SCOTTIES WHO SEEM COMFORTABLE ON THEIR BACKS, & SEEM FLEXIBLE & SCOTTIES WHO SEEM COMFORTABLE ON THEIR BACKS, & SEEM FLEXIBLE & AGILE ARE OTHER REASSURING SIGNS OF HEALTHY SPINE & EXTREMITIESAGILE ARE OTHER REASSURING SIGNS OF HEALTHY SPINE & EXTREMITIES 6464
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1995 STCA Health Survey *DISEASE DISEASE Mode of Mode of Frequency of Est. Carrier Frequency of Est. Carrier
InheritanceInheritance Occurrence FrequencyOccurrence FrequencyCMO R ~ 1 / 1700 4.7%Hip Hip DysplasiaDysplasia Poly Poly ~ 1 / 1700 4.7%~ 1 / 1700 4.7%von Willebrand's R ~ 1 / 500 8.4%Cerebellar ataxia R ~ 1 / 200 13.0%
LuxatingLuxating Patella R? / Poly? ~ 1 / 80Patella R? / Poly? ~ 1 / 80 19.5%19.5%
Underbite Und ~ 1 / 50 24.7%Scottie cramp R ~ 1 / 30 29.3%AtopicAtopic dermatitisdermatitis Und Und ~ 1 / 18 ~ 1 / 18 35.8% 35.8%
(skin allergies)(skin allergies)
R = Recessive, D = Dominant, Poly = Polygenic, Und = Undetermined, X-R = Sex-linked recessive* http://clubs.akc.org/stca/healthsurvey.htm
Control of Canine Genetic Diseases, G.Padgett, DVM (1998)
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““ THANK YOU THANK YOU ““Marcia Dawson, DVMMarcia Dawson, DVMDiana Rosenstein, DVM Diana Rosenstein, DVM (MSU Dept. Radiology.)(MSU Dept. Radiology.)
Daniel A. Daniel A. DegnerDegner, DVM, DACVS, DVM, DACVSDrs. Foster, Smith, Newman, Drs. Foster, Smith, Newman, VidtVidt, , et.alet.al..STCC / Fellow MembersSTCC / Fellow Members
NeraNera, Angus, Lola, Angus, Lola
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““ECONOMYECONOMY””
OF OF
SCOTTIES :SCOTTIES :
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GROOMING:GROOMING:
$ $ (BUT WORTH IT !)(BUT WORTH IT !)
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““DOG TOYSDOG TOYS””
DESTROYED DESTROYED
IN IN MINUTESMINUTESBY BY
SCOTTIE . . .SCOTTIE . . .
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$ $$ $7171
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““PREMIUMPREMIUM””
DOG FOODDOG FOOD
& TREATS& TREATS
$ $ $$ $ $..
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REPAIR REPAIR
OFOF
WOODWORK,WOODWORK,
FURNITURE, FURNITURE,
etc.etc.
$ $ $ $.$ $ $ $.
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FAITHFUL GREETINGFAITHFUL GREETINGAT THE END AT THE END
OF A OF A
LONG, DIFFICULT LONG, DIFFICULT
DAY . . . . .DAY . . . . .7474
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PRICELESS !PRICELESS ! 7575
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MY GOAL IN LIFEMY GOAL IN LIFEIS TO BE IS TO BE AS GOODAS GOOD
OF A PERSONOF A PERSONAS MY DOGAS MY DOGALREADY ALREADY
THINKS I AMTHINKS I AM-Anonymous-
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