Let's see, I don't have a deep knowledge on medical astrology but I can take a stab at the chart and make a call.
His 6th house (illness, ailments) is Libra, ruled by Venus. His 1st house is also ruled by Venus. So this is testimony 1 that quesited may be injured or hurt in some way, but by no means is this strong enough. However, we have another testimony in that there is an exact inconjunct aspect between Venus and Saturn. Inconjuncts can also show ailments. Due to the planets and signs involved, I am going to prognosticate that there was a constriction of the nerves in the lower back/buttocks region. Since the "subject" is Venus in Gemini ruling the 6th house Libra, it is the area to which the ailment affects. Saturn's influence is the one causing the ailment.
Are you willing to share what has happened to him? My view is that the illness would be described by this aspect. If not from what I said, then from some other combinations of the symbols.