So would this dog be even more prone to hip dsyplasia. I may be wrong, but arent Great Danes prone to hip problems? Seems like a dog this big could have trouble..
 I pulled this off of OFA's (Orthapedic Foundation for Animals) site.
Statistical data on a Great Dane compared to 2 other breeds.  The reason I threw the German Sheperd up is because most people associate the German Sheperd as being very prone to Hip Dysplasia.  But, take a look at the Rottweiler & you'll see the stats are worse in both hips & elbows.  I personally think this has come from years of poor breeding of a popular breed.  These stats were gathered from 1974-2007.  I am curious to see what the stats would be from just the last 5 years.  So to answer the question are Dane's prone to hip, elbow, or joint issues ...sure.  But nothing hardly compared to some other popular breeds.  Hell, the Rottweiler was rank #2 as being the worst with elbows.  This is sort of the thing I was never aware of until we had to bring in our dog for his prelims.  I didn't realize this breed has become so messed up.  One other thing...sure Dane's may be prone to heart problems.  But one thing I can say about people that I know who owns Danes is that they are very proactive people.  I would bet these stats may reflect a good percent of heart tests, but the owners may have a lot to contribute to the better results by taking proactive measures early in the dogs life.
GREAT DANERegistry Rank                 Evaluations   Percent     Abnormal      Percent Normal
BAER HEARING TEST            N/A               1               0.0              100.0
CARDIAC                         39               1712          0.2              98.9
ELBOW                             51               1265          4.1              95.8
HIPS                               77               10406          12.0             86.4
PATELLA                         N/A               49              2.0              98.0
THYROID                         25               1360           6.0             78.0
GERMAN SHEPHERD DOGRegistry   Rank                 Evaluations   Percent       Abnormal     Percent Normal
BAER HEARING TEST          N/A               13              0.0              100.0
CARDIAC                           34               375              0.3              99.7
ELBOW                               8              26464          19.4              80.4
HIPS                                38               92736           19.1              78.9
LEGG-CALVE-PERTHES          N/A               2              0.0               100.0
PATELLA                           67                 95              1.1               98.9
THYROID                          48                364              3.0               90.4   
ROTTWEILERRegistry   Rank                Evaluations   Percent       Abnormal     Percent Normal
BAER HEARING TEST         N/A               2               0.0             100.0
CARDIAC                         36                3227          0.3             99.3
ELBOW                            2                 10956          40.8           58.7
HIPS                              29                87814        20.4           77.7
LEGG-CALVE-PERTHES      N/A               2                0.0            100.0
PATELLA                        58                  237              1.7            98.3
THYROID                       44                  542              3.3            82.5