what is ur diagnosis and plan of management

what is the cause for this condition and your plan of management?

a 14 yr old boy came with chief complaints of deformity of rt forearm
h/o trauma 6 years ago..was hit by teacher at school
later he was taken to an outside hospital where the reports suggest he had been operated for compartment syndrome and the operative notes say that they found pockets of pus

o/e
valgus deformity at forearm
midline healed surgical incision
movements are normal except ulnar deviation at wrist

x-ray

clinical case

a 30 year old male came with chief complaints of pain in hip since 1 year.swelling since 6 months
no relevant trauma
no weight loss
no loss of appetite
O/E: 40 degree of fixed flexion deformity
         swelling seen and palpable anteriorly and posteriorly
          ROM very painful

what is ur radiological diagnosis
what is ur approach to this case