By definition, the etiology of primary osteoarthritis is unknown, but the pathology and pathogenesis of osteoarthritis have been extensively studied. [5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15] Historically, osteoarthritis has been divided into primary and secondary forms, although this division is somewhat artificial.
What's your relationship to the couple? - While the average gift ranges from $50 to $100 for those under 30, expect to spend $100 or more if you're close friends with the couple and are more established financially. For your nearest and dearest friends and relatives, gift costs can range from over a $100 to $200 or more.
The average friend of the couple spends $79 on a wedding gift, according to TheKnot.com. 1  Family members spend nearly twice that: $146. The Knot advises wedding guests to consider the following formula: 2  Co-worker or distant family friend or relative: $75-$100. 3  Relative or friend: $100-$125. 4  Close relative or close friend: $100-$150.